When are students permitted to access the chemical storage room?.
Answers
"When are students permitted to access the chemical storage room?" is, students should never be allowed to enter the chemical storage room. It is extremely important to keep chemicals away from students for their safety and wellbeing.
Chemical storage rooms are the places where all the chemicals are kept in an educational institution. A chemical storage room in an educational institution contains a range of chemicals that are used in experiments and activities related to the subjects of chemistry, biology, and physics. Most chemicals, on the other hand, are extremely hazardous to people, and the toxicity of each chemical should not be overlooked when handling them. The safety of the students should always be the top priority of the educational institution. Thus, students are not allowed to enter the chemical storage room under any circumstances .Only qualified chemistry, biology, or physics teachers with training in chemical handling and safety should be given access to the chemical storage room. This would ensure that no student would be injured while conducting experiments. Hence, it is recommended that the chemical storage room is accessed only by trained professionals.
Thus, students should never be allowed to enter the chemical storage room as it could result in serious injuries or even death. Only trained professionals, such as teachers who have taken chemical safety courses, should be permitted to enter the chemical storage room.
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Related Questions
Aluminum has a density of 2.70 g/mL. A sample of aluminum weighs 67.5 g. If this sample is put into a graduated cylinder that has 35 mL, what volume will the water rise to?
Answers
Answer:
60 ml
Explanation:
Now, we know that density = mass/volume
Mass of aluminium = 67.5 g
volume of aluminium =?
density of aluminium = 2.70 g/mL
volume of aluminium = mass/density = 67.5/2.70 = 25 ml
Since volume of water in the cylinder = 35 ml
The water rises to ; 35 ml + 25 ml = 60 ml
Can some plzzz help me with this plzzz i was not taught on this topic but was quiz.... help me plzz
Answers
I’ve been gifted and blessed with certain skills that have allowed me to create wealth that I don’t necessarily deserve. And I assume that I was gifted with these skills, and the resources they created, because I’m supposed to do something positive with them. So, today, I donate 50 percent of my finances, and, probably more importantly, 50 percent of my time. I’ve been doing that since the early 90s, so for the last 15 years or so.
–“Interview with David Weekley,”
Philanthropy Magazine
Read the excerpt from an interview with David Weekley. What is the author’s reason for donating?
to help others
to learn from others
to get a tax deduction
to gain pleasure
Answers
Answer:
to help others
Explanation:
he was blessed so he wanted to give back to others. please give brainliest, have a great day/night
Answer:
correct :)
Explanation:
the person is right
what is the element name for 2,5
Answers
Answer:
I think it's vanadium
Explanation:
Hope this helps
is Boyle's law universally true? if not mention one of the its limitations
Answers
a. Consider the two octahedral complexes [Ru(bipy)3]2+ and [Fe(bipy)3]2+. Which of these complexes would more easily racemize through intramolecular ligand substitution? Explain your answer. b. You shine light on these species to generate their respective photoexcited states. Assuming you perform a metal-to-ligand charge transfer through the photoexcitation, which of the excited state molecules would you expect to be more reactive? c. Would you consider the photoexcited complex to be an oxidant, a reductant, or both? Explain.
Answers
a. The complex [Ru(bipy)3]2+ would more easily racemize through intramolecular ligand substitution as compared to [Fe(bipy)3]2+. This is because Ru(II) is a larger and more electropositive metal ion than Fe(II), resulting in weaker metal-ligand bonds. Weaker bonds make it easier for ligand substitution to occur, thus allowing the complex to racemize more easily.
b. When you perform a metal-to-ligand charge transfer (MLCT) through photoexcitation, the complex with the more reactive excited state would be [Ru(bipy)3]2+. This is because the MLCT results in a reduction of the metal center and oxidation of the ligand. The Ru(II) center in the [Ru(bipy)3]2+ complex is more electropositive and has a greater ability to accept electrons, making it more reactive in the excited state.
c. The photoexcited complex can be considered both an oxidant and a reductant. This is because the photoexcitation process involves the transfer of an electron from the metal center to the ligand, which results in a reduction of the metal center (making it a potential reductant) and an oxidation of the ligand (making it a potential oxidant). The photoexcited complex has the potential to react in both ways, depending on the specific reaction and the environment it is in.
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I don't know how to write about tentative.....can u help me?
Answers
Answer:
The definition of tentative is not definite or final. An example of tentative is possible, though not definite, plans to go to the movies sometime on Friday.
If a bacterium adapted to a cold environment were moved to a much warmerenvironment, what changes to the membrane lipids should the bacterium make?A. Because increased temperature decreases fluidity, the bacterium shouldincrease the length of fatty acid tails on membrane lipidsB. Because increased temperature increases fluidity, the bacterium shoulddecrease the length of fatty acid tails on membrane lipidsC.Because increased temperature decreases fluidity, the bacterium shoulddecrease the length of fatty acid tails on membrane lipidsO Because increased temperature increases fluidity, the bacterium shouldincrease the length of fatty acid tails on membrane lipids
Answers
Option B is the correct answer. If a bacterium adapted to a cold environment were moved to a much warmer environment, the increased temperature would increase the fluidity of the membrane.
The fluidity of the bacterial membrane is critical for its function, and it depends on the composition of the membrane lipids. At low temperatures, the membrane lipids of the bacterium from a cold environment have more unsaturated fatty acids, which increase the fluidity of the membrane to maintain its function. In contrast, at high temperatures, the membrane lipids of the bacterium from a warm environment have more saturated fatty acids, which decrease the fluidity of the membrane.
If a bacterium adapted to a cold environment were moved to a much warmer environment, the increased temperature would increase the fluidity of the membrane. To maintain the integrity and function of the membrane, the bacterium must decrease the fluidity of the membrane. The bacterium can do this by decreasing the length of the fatty acid tails on the membrane lipids. Shorter fatty acid tails result in fewer interactions between the lipid molecules, which decreases the fluidity of the membrane. Therefore, option B is the correct answer.
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Pedro is baking a cake for his experiment on chemical changes. He knows a chemical change will occur when he puts the cake mixture in the oven. He would like to know what will happen when the cake is removed from the oven. What prediction would you make for Pedro's experiment? A. The chemical changes occurred because the chemicals changed. B. The chemical changes occurred because there was a change in light energy. C. The fruit and the hamburgers were affected by an increase in heat energy. D.The fruit and the hamburgers were affected by a decrease in heat energy.
Answers
Answer:
A. The chemical changes occurred because the chemicals changed.
Explanation:
When baking a cake several chemical reactions occur that change the chemical composition of the ingredients used in baking. An ingredient like baking powder releases carbon dioxide when it undergoes a temperature change in the oven. A chemical change is supposed to change the form of a substance.
An endothermic reaction also occurs when the ingredients absorb heat energy to produce several changes. The firmness of the cake occurs because of the heat absorbed by the proteinous content of the egg.
2. Distamycin and derivatives have exhibited antiviral, antibiotic, and antitumor activity by binding to the minor groove of DNA (J. Med. Chem. 2004, 2133). Place a line through each bond of distamycin that would be cleaved by acid hydrolysis.
Answers
The bond between the nitrogen and the amide group in distamycin would be cleaved by acid hydrolysis.
Distamycin is a peptide antibiotic that has demonstrated antiviral, antibiotic, and antitumor activity. It does this by binding to the minor groove of DNA.Acid hydrolysis is a process in which molecules are broken down in the presence of an acid. Acid hydrolysis is widely used to cleave certain types of chemical bonds.
When treated with acid hydrolysis, the bonds that hold the molecule of distamycin are broken, leading to the production of its derivatives.To identify the bonds that would be cleaved by acid hydrolysis in distamycin, we must first examine its chemical structure. Distamycin has two aromatic rings, a nitrogen-containing heterocycle, and an amide-containing tail. In the presence of acid, the amide bond is cleaved, leading to the production of two smaller peptides and an acid. To place a line through each bond that would be cleaved by acid hydrolysis, we can isolate the amide bond in the structure.
Thus, the amide bond is located between the nitrogen-containing heterocycle and the amide-containing tail. Therefore, the bond between the nitrogen and the amide group is the one that would be cleaved.
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where do most of the elements on the periodic table come from?
Answers
Stars
All the elements on earth have been cooked from billions of years in stars and the released in the universe through super-nova explosions
when aqueous solutions of potassium carbonate and magnesium chloride are combined, solid magnesium carbonate and a solution of potassium chloride are formed. the net ionic equation for this reaction is:
Answers
The net ionic equation for the given reaction is KCO₃ + MgCl₂---->MgCl₂ + KCl.
When aqueous solutions of potassium carbonate and magnesium chloride are combined, solid magnesium carbonate and a solution of potassium chloride are formed,then
KCO₃ + MgCl₂---->MgCl₂ + KCl. will form.
Like a molecular equation, which communicates compounds as particles, an ionic equation is a synthetic equation where the electrolytes in fluid arrangement are communicated as separated particles. Normally, this is a salt broken down in water, where the ionic species are trailed by (aq) in the situation to demonstrate they are in fluid arrangement.
The particles in fluid arrangements are balanced out by particle dipole cooperations with water atoms. Nonetheless, an ionic equation might be composed for any electrolyte that separates and responds in a polar dissolvable. In a fair ionic condition, the number and sort of particles are similar on the two sides of the response bolt. Furthermore, the net charge is similar on the two sides of the situation.
Solid acids, solid bases, and dissolvable ionic equations (typically salts) exist as separated particles in fluid arrangement, so they are composed as particles in the ionic condition.
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Part 2: Enthalpy of iron with vinegar reaction
Table 8.2: Temperatures of the iron reaction
Time
Temperature, °C
Initial
5 minutes
10 minutes
20 minutes
15 °C
17 °C
20 °C
23 °C
4. Did the temperature go up or down? How much?
5. Is this an exothermic or endothermic reaction?
Temperature change, °C (AT)
6. Think of some other chemical reactions. List them and the type of reaction: exothermic
or endothermic.
Example: Burning coal - exothermic
Answers
4) The temperature went up by 3 degrees
5) The reaction is exothermic
6) The burning of hydrocarbons is an exothermic reaction
What is enthalpy?One of the characteristics of a chemical change is that there could be a change in the temperature of the system. The temperature of the system could be found to have been increased or decreased as the case may be.
In any case, the change in the temperature of the system is what is going to tell is whether the reaction was exothermic or endothermic. If the reaction is endothermic, there is going to be a drop in temperature but if the reaction is exothermic, there is going to be an increase in temperature.
Now we can see from the table that the temperature is increasing by a factor of about three degrees so we can say that the reaction is exothermic.
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A Doctors Order requests 500 mg of ampicillin IV in a 50-mL MiniBag of 0.9% sodium chloride injection. You have a 4-g vial of sterile powder, which, when reconstituted, will provide 100 mg/mL of ampicillin. How many millilitres of reconstituted solution will be needed to provide the 500-mg dose?
A. 4 ml
B. 5 ml
C. 2.5 ml
D. 25 ml
2. Rx: Penicillin G potassium 500 000 units IV q6h in 50-mL MiniBag of 0.9% sodium
chloride injection. You have a vial of Penicillin G containing 5 000 000 units. After
reconstitution, the total volume of the vial is 20 mL, How many millilitres of penicillin
should be drawn up to provide the prescribed dose for each 50-mL MiniBag?
A. 0.5 mL
B. 1 mL
C. 4 mL
D. 2 mL
3, In reference to question 2, how many 50-mL MiniBags would you provide to cover 24
hours of treatment?
A. 1
B. 6
C. 3
D. 4
4. Rx: Dexamethasone 12 mg IV push Drug available: Dexamethasone 4 mg/5 mL How
many millilitres would be needed to be drawn up for one dose?
A. 3 ml
B. 2.4 ml
C. 10 ml
D. 15 ml
5. Rx: Heparin 40 000 units in D5W 1000 mL Drug available: Heparin 10 000 units/mL 2
mL single-dose vial How much heparin solution would be injected into the D5W 1000-
mL bag?
A. 1 ml
B. 2 mL
C. 4 mL
D. 8 mL
Answers
(1) The volume of reconstituted solution is 5 mL. Option B is correct. (2)The amount of penicillin needed is 0.5 mL. Option A is correct. (3)Total 4 Mini-Bags o cover 24 hours of treatment. Option D is correct. (4)Total, 15 ml. will be needed to drawn up for one dose. Option D is correct. (5)The required amount of heparin solution is 8 mL. Option D is correct.
To calculate the volume of reconstituted solution needed to provide the 500 mg dose of ampicillin, we can use the formula;
Volume (mL) = Dose (mg) / Concentration (mg/mL)
Dose = 500 mg
Concentration = 100 mg/mL
Volume (mL) = 500 mg / 100 mg/mL
= 5 mL
Hence. B. is the correct option.
To calculate the amount of penicillin needed to provide the prescribed dose for each 50-mL MiniBag, we can use the ratio:
Prescribed dose : Total amount in the vial = Volume drawn up : Volume of the vial
Prescribed dose = 500,000 units
Total amount in the vial = 5,000,000 units
Volume of the vial = 20 mL
Volume drawn up = (Prescribed dose / Total amount in the vial) × Volume of the vial
Volume drawn up = (500,000 units / 5,000,000 units) × 20 mL
Volume drawn up = 0.1 mL
Hence, A. is the correct option.
To cover 24 hours of treatment, you would provide the number of MiniBags required to administer the prescribed dose every 6 hours:
24 hours / 6 hours = 4 MiniBags
Hence, D. is the correct option.
The required dose is 12 mg, and the available concentration is 4 mg/5 mL. We can use the ratio;
Dose : Concentration = Volume drawn up : Total volume
Dose = 12 mg
Concentration = 4 mg/5 mL
Volume drawn up = (Dose / Concentration) × Total volume
Volume drawn up = (12 mg / 4 mg/5 mL) × 5 mL
Volume drawn up = 15 mL
Hence, D. is the correct option.
The required amount of heparin solution to be injected into the D5W 1000-mL bag can be calculated using the ratio:
Amount to be injected : Concentration = Volume drawn up : Total volume
Amount to be injected = 40,000 units
Concentration = 10,000 units/mL
Volume drawn up = (Amount to be injected / Concentration) × Total volume
Volume drawn up = (40,000 units / 10,000 units/mL) × 2 mL
Volume drawn up = 8 mL
Hence, D. is the correct option.
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chlorine gas is bubbled through an acidified solution of potassium permanganate (chlorate ion is one product)
Answers
When chlorine gas is bubbled through an acidified solution of potassium permanganate, a chemical reaction occurs, resulting in the formation of chlorate ions as one of the products.
The potassium permanganate acts as an oxidizing agent, while the chlorine gas acts as a reducing agent. The acidified solution helps to facilitate the reaction by providing a suitable environment for the chemical reaction to take place. Chlorine gas is highly reactive and can undergo oxidation and reduction reactions, making it a useful chemical in many industrial applications. In this particular reaction, it reacts with the potassium permanganate to form chlorate ion, which has its own range of applications in various industries, including the manufacture of fertilizers, herbicides, and explosives. Overall, the reaction between chlorine gas and an acidified solution of potassium permanganate is a useful chemical process that has many industrial applications. It highlights the importance of understanding the properties of different chemicals and how they can be used in various processes to create new products.
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What volume of 0.500 M HNO₃(aq) must completely react to neutralize 100.0 milliliters of 0.100 M KOH(aq)?
Answers
Answer:
v = 500 milliliters
Explanation:
\(HNO_{3}\) ⇒ \(H^{+} + NO^{3-}\)
\(KOH\) ⇒ \(K^{+} + OH^{-}\)
1 \(H^{+}\) to 1 \(OH^{-}\)
\(\frac{0,5}{V} = \frac{0,1}{100} \\\\v * 0,1 = 50\\v = 500 milliliters\)
Which compound will contain the most polar bond? A. bromoethane, H3CCH2Br B. ethene, H2CCH2 C. ethane, H3CCH3 D. chloroethane, H3CCH2Cl
Answers
The compound that will contain the most polar bond is D. chloroethane, H3CCH2Cl. This is because the bond between the carbon and chlorine atoms is more polar than the bonds between the carbon and hydrogen atoms in the other compounds. The polarity of a bond is determined by the difference in electronegativity between the atoms involved in the bond. Chlorine has a higher electronegativity than carbon, so the bond between them will be more polar. The other compounds listed have bonds between carbon and hydrogen atoms, which have a smaller difference in electronegativity and are therefore less polar.
Alkanes contain the maximum possible amount of hydrogen, they are known as being __________. What one word completes the sentence?
Answers
Alkanes contain the maximum possible amount of hydrogen, they are known as being saturated hydrocarbon.
What is alkanes?The easiest category of hydrocarbons would be the alkanes. They exclusively possess hydrogen as well as carbon. So every hydrogen atom produces one link, while each carbon atom generates four.
What is hydrocarbon?When all of a hydrocarbon's carbon-carbon bonds possess single bonds, the hydrocarbon was said to have been saturated. A hydrocarbon would be an organic substance with only carbon as well as hydrogen as its components.
Therefore, alkanes contain the maximum possible amount of hydrogen, they are known as being saturated hydrocarbon.
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g fully reacting an aldehyde with an alcohol will produce? a. an acetal b. a primary alcohol c. no reaction d. a carboxylic acid
Answers
Fully reacting an aldehyde with an alcohol will produce an acetal.
What is an acetal?
Acetal is a functional group consisting of two ether groups bonded to the same carbon atom. It's also called a 1,1-dialkoxyalkane.
Acetals are generated by the reaction of carbonyl compounds with alcohols under acidic or basic conditions.
Acetals can be used as protecting groups for carbonyls in organic synthesis. The carbonyl group is made less reactive by formation of the acetal, which shields it from further reaction.
Therefore, reaction with nucleophiles such as organolithium reagents or Grignard reagents is prevented.
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The first sign of neutrophilic differentiation and appearance of secondary granules is evident in what cell type?
Answers
The appearance of secondary granules and the first indication of neutrophilic differentiation can be seen in : Myelocyte.
Early granulocyte precursors (myeloblast and promyelocyte) appear similar across granulocytic cell lines until they reach the myelocyte stage, which is the final stage capable of cell division. They develop distinctive secondary lineage-specific granules at this stage (neutrophilic, eosinophilic or basophilic).
OR
White blood cells (leukocytes) go through the myelocyte stage of development where granules first show up in the cell cytoplasm. A precursor called a myeloblast transforms into a promyelocyte, which can be recognized by a nucleus that is slightly indented and shifted to one side of the cell.
When the promyelocyte cytoplasm fills with numerous granules, which may obscure the nucleus, the myelocyte stage develops. Hence, the first sign of neutrophilic differentiation and appearance of secondary granules is evident in myelocyte cell type.
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Which of the following molecule is nonpolar?
A) CH2F2
B) BFCl2
C) NH2Br
D) SeO3
E) SCl2
which of the following molecules/ions is/are likely to be planar? i. PCI3
ii. BF4- iii. XEF4 iv. BRF3 v. BRF5 vi. H3O group of answer choices a. ii and iii b. iii and iv c. iv and v d. i and iv e, ii and vi only
Answers
The molecule that is nonpolar is E) SCl2. This is because SCl2 has a bent molecular shape, and the sulfur atom has a greater electronegativity than the chlorine atoms, resulting in a nonpolar molecule.
The molecules/ions that are likely to be planar are iii. XeF4, iv. BRF3, and v. BRF5. This is because all three molecules have a trigonal bipyramidal molecular geometry, which results in a planar arrangement of atoms in the equatorial plane. The other options have different molecular geometries that do not result in a planar arrangement. Therefore, the answer is c. iv and v. The molecule has a bent geometry with bond angles of approximately 104.5 degrees, which results in the equal distribution of the electron density and no net dipole moment, making it a nonpolar molecule. The molecules/ions likely to be planar are I. PCI3 - Not planar (trigonal pyramidal) ii. BF4- - Planar (tetrahedral iii. XEF4 - Planar square planar iv. BRF3 - Not planar T-shaped v. BRF5 - Not planar (square pyramidal vi. H3O - Not planar trigonal pyramidal So, the correct answer is B) iii and iv (XeF4 and BF4-).
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A balloon inflated in a room at 24 °C has a volume of 2.00 L. The balloon is then heated to a temperature of 88 °C. What is the volume of the balloon assuming the pressure remains constant?
Answers
Therefore, the volume of the balloon when heated to 88°C is 2.432 L.
What is volume?In the case of a gas, the volume is the amount of space that the gas occupies in a container. The volume of a gas can be affected by changes in pressure and temperature, as described by the ideal gas law. In this case, the volume is often expressed in terms of standard temperature and pressure (STP), which are defined as a temperature of 0°C and a pressure of 1 atmosphere (atm). In chemistry, volume is an important property for understanding the behavior of substances in chemical reactions. The volume of reactants and products can be used to determine the stoichiometry of a reaction, which is the relationship between the amounts of reactants and products in a chemical equation.
Here,
To solve this problem, we can use the ideal gas law, which states that:
PV = nRT
where P is the pressure of the gas, V is its volume, n is the number of moles of gas, R is the universal gas constant, and T is the temperature in Kelvin.
Since the pressure of the gas is assumed to remain constant, we can rearrange the ideal gas law to solve for V:
V1/T1 = V2/T2
where V1 is the initial volume of the balloon, T1 is the initial temperature in Kelvin (24°C = 297 K), V2 is the final volume we want to find, and T2 is the final temperature in Kelvin (88°C = 361 K).
Using this equation, we can plug in the given values and solve for V2:
V1/T1 = V2/T2
2.00 L / 297 K = V2 / 361 K
Multiplying both sides by 361 K, we get:
V2 = 2.00 L x (361 K / 297 K)
V2 = 2.00 L x 1.2162
V2 = 2.432 L
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Some industries require a decrease in the rates of reactions instead of speeding them
up.
1) Name an industry that requires such criteria.
2) How is this possible? Suggest and explain two different ways
Answers
Food industries require that reaction rates be lowered and this can be done by addition of preservatives and by freezing food substances.
What is rate of reaction?
The rate of a reaction is a measure of amount of substances converted to products per unit.
Substances that speed up rate of reactions are known as catalysts.
Some catalysts though, reduce or slow down the rate of reactions.
An industry that requires the rate of reactions to slow down is the food industry.
Some methods employed to slow down reaction rates include:
Freezing - lowering temperature reduces rate of reactionsUse of preservatives - preservatives are chemical that inhibit certain organisms and catalysts from acting on foodTherefore, food industries require that reaction rates be lowered and this can be done by addition of preservatives and by freezing food substances.
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What is Decomposition Reaction
Answers
Answer:
Explanation:
Decomposition reaction, also known as analysis or dissociation, is a type of chemical reaction in which a compound breaks down into simpler substances or elements. In this reaction, a single reactant undergoes a chemical change and produces two or more products.
The decomposition reaction can be represented by the general equation:
AB → A + B
Where AB is the reactant, and A and B are the products. The reactant AB is usually a compound, and it breaks down into its constituent elements or simpler compounds.
There are different types of decomposition reactions, including:
Thermal decomposition: It occurs when a compound is heated, resulting in its decomposition into simpler substances. For example, the thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2):
CaCO3 → CaO + CO2
Electrolytic decomposition: It takes place when an electric current is passed through an electrolyte, causing it to break down into its component ions. For instance, the electrolysis of water (H2O) leads to the decomposition into hydrogen gas (H2) and oxygen gas (O2):
2H2O → 2H2 + O2
Photochemical decomposition: It occurs when a compound undergoes decomposition due to exposure to light energy. Chlorine gas (Cl2) can decompose into chlorine atoms (Cl) under the influence of light:
Cl2 → 2Cl
These are just a few examples of decomposition reactions. They are important in various chemical processes and are used in industries, laboratory experiments, and natural phenomena. By understanding and controlling decomposition reactions, scientists can gain insights into the behavior of different compounds and develop practical applications in fields such as chemistry, materials science, and environmental science.
Answer:
Explanation:
reaction in which a compound breaks down into simpler substances or elements
This is due tomorrow and my teacher thinks I did it but really I have no idea and I’m too lazy to try and look up answers
Answers
Name - Function
A. Brainstem Control center, regulates vital functions such as breathing, heart rate, and blood pressure.B. Cerebrum Higher processes such as thought, memory, and emotion.C. Cerebellum Physical coordination and balance.What does the brain control?The brain regulates a variety of bodily processes, such as movement, sensation, thinking, emotion, and behavior.
Activity and Part of the brain it involves are:
a. Testing a hamburger - Sensory cortex in the parietal lobe
b. Artistic ability - Right hemisphere of the cerebrum
c. Kicking a soccer ball - Motor cortex in the frontal lobe
d. Rate of breathing - Medulla oblongata in the brainstem
e. Tying your shoes - Cerebellum
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1. Given the formula of a substance:
H
HH
NE
C=C-C=C
7
H
H
H
What is the total number of shared electrons in a molecule of this substance?
A) 22
B) 11
C) 9
D) 6
Answers
A molecular formula is a chemical formula for a molecular compound that shows the types and numbers of atoms in the compound's molecule. Ammonia is a nitrogen-hydrogen compound.
What is the total number of shared electrons in this substance's molecule?The total number of shared electrons in a molecule is 22.
Ionic and covalent compounds are the two types of compounds. Molecules are the most basic unit of a covalent compound, and they can be represented in a variety of ways.
Atoms are the smallest units of matter that retain an element's fundamental chemical properties. However, much of the study of chemistry is concerned with what happens when atoms combine to form compounds. A compound is a unique collection of atoms held together by chemical bonds.
The electrostatic attraction between the positively charged nucleus and the negatively charged electrons surrounding it holds the structure of the atom together, and the stability within chemical bonds is also due to electrostatic attractions. Consider the two most common types of chemical bonds: covalent bonds and ionic bonds. Two atoms share pairs of electrons in covalent bonds, whereas electrons are fully transferred between two atoms in ionic bonds.
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which 3 tubes were used to determine the optimal ph for amylase activity?
Answers
The three tubes used to determine the optimal pH for amylase activity are typically filled with buffer solutions at different pH values, such as pH 5.0, pH 7.0, and pH 9.0.
The optimal pH for amylase activity can be determined by testing the enzyme's activity at different pH levels. Typically, a range of pH values is tested to determine the optimal pH, and three tubes are commonly used for this purpose.
These three tubes are typically filled with a buffer solution at different pH values, such as pH 5.0, pH 7.0, and pH 9.0. The amylase enzyme is then added to each tube, and the activity of the enzyme is measured under each condition. By comparing the enzyme activity at different pH levels, the optimal pH for amylase activity can be determined.
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If the temperature of the water were 0°C and the pressure was above 760 mm Hg, what phase would the water be in?
-Gas
-Liquid
or
-Solid
(Note pick one answer only)
Answers
Answer:
the answer is liquid.
Explanation:
Identify the strongest reducing agent given the following reduction potentials.
Cu2+ /Cu +0.34 V Fe3+ /Fe2+ +0.77 V Ag+ /Ag +0.80 V
* Fe2+
* Fe3+
* Ag+
* Cu2+
* CuAg
Answers
The strongest reducing agent among the given reduction potentials is Fe2+. This is because Fe2+ has the highest negative reduction potential among the options (-0.44 V) which indicates a stronger tendency to lose electrons and get oxidized, thereby reducing another species.
A reducing agent is a substance that undergoes oxidation and causes the reduction of another species in a chemical reaction. The more negative the reduction potential of a substance, the stronger it is as a reducing agent because it will more readily donate electrons to reduce other species.
On the other hand, the stronger oxidizing agent is the one with the highest positive reduction potential, which is Ag+ in this case. An oxidizing agent is a substance that undergoes reduction and causes the oxidation of another species in a chemical reaction.
It's important to note that Cu and Ag can form alloys, but CuAg cannot be considered as an option in this context as it is not an ion that can undergo reduction or oxidation.
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You have 550mL of 7M solution HCI and you want to make 3L of diluted solution, what will the new concentration be?
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According to the molar concentration, if you have 550 ml of 7 M solution HCI and you want to make 3 L of diluted solution,the new concentration will be 1.28 M.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.In case of two solutions it is calculated as, M₁V₁=M₂V₂ on substitution gives M₂=7×550/3000=1.28 M.
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