Answer:
The answer is
26.94 g/mLExplanation:
The density of a substance can be found by using the formula
\(density = \frac{mass}{volume} \\ \)
From the question
mass = 970 g
volume = 36 mL
The density of the object is
\(density = \frac{970}{36} \\ 26.944444...\)
We have the final answer as
26.94 g/mLHope this helps you
What, if any, precipitate forms when an aqueous solution of zinc chloride is mixed with an aqueous solution of ammonium phosphate? a) NHACI b) Zn2(PO4)3 c) no precipitate d) Zn3(PO4)2 Od С Ob a
When an aqueous solution of zinc chloride is mixed with an aqueous solution of ammonium phosphate, the precipitate formed is Zn₃(PO₄)₂.
Zinc chloride (ZnCl₂) dissociates into Zn²⁺ and 2Cl⁻ ions in solution, while ammonium phosphate (NH₄₃PO₄) dissociates into 3NH₄⁺ and PO₄³⁻ ions. When these ions combine, the Zn²⁺ ions react with the PO₄³⁻ ions to form the insoluble compound zinc phosphate (Zn₃(PO₄)₂), which precipitates out of solution.The other options listed, NH₄Cl (ammonium chloride) and Zn₂(PO₄)₃ (zinc phosphate), are incorrect. NH₄Cl will remain in solution as dissolved ions, and Zn₂(PO₄)₃ is the formula for zinc phosphate, not the precipitate formed in this specific reaction.Therefore, the correct answer is d) Zn₃(PO₄)₂, as it is the precipitate that forms when zinc chloride is mixed with ammonium phosphate.
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Identify the biotic factors in the picture.
A)Deer
B)Rocks
C)Water
D)Grass
Help me plz l
is no sulfate shampoo an acid, base, compound, mixture, or element?
Answer:free shampoo Here In Seconds! Easy to Use. Immediate Response - 24/7. Fast & Free. Highest Standards. Guaranteed Satisfaction. Serving You Better. Results in 5 Sec. or Less. Highly Qualified Search. 1,000,000 Unique Results. Immediate Results. Services: Search Services, Web Results, Result Pages.
Explanation:
Complete and balance the following redox reaction in basic solution. Be sure to include the proper phases for all species within the reaction. CIO (aq) + CO2(aq) → CIO₂(g) + CO₂(g)
The balanced redox reaction in basic solution is: \(CIO(aq) + CO_2(aq) + OH^{-(aq)} \rightarrow CIO_2(g) + CO_2(g) + H_2O(l)\)
To balance this redox reaction in basic solution, we first need to identify the oxidation state of each element in the equation. We see that the oxidation state of chlorine changes from +1 to +4, while the oxidation state of carbon changes from +4 to +2.
Next, we balance the equation in acidic solution, as we normally would, and then add OH⁻ to both sides of the equation to neutralize the H⁺ ions and form water molecules. This adds an equal number of H⁺ and OH⁻ ions to both sides of the equation, so the charge balance is maintained.
After balancing the equation in basic solution, we make sure that the number of atoms of each element is the same on both sides, and that the charges are balanced. Finally, we add the phases of each species to complete the equation.
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How many molecules of carbon dioxide must enter the Calvin cycle in order for the plant to produce a sugar containing 24 carbon atoms
Answer:
24 molecules of CO2
Explanation:
Each molecule of CO2 has only one carbon atom, therefore we need 24 CO2 molecules to get the 24 carbon atoms, as requested.
As a result of this process, the proportions of oxygen and carbon dioxide in
air breathed in and air breathed out change.
Which one of the statements is true? Tick the correct box. [1]
- Air breathed out has less carbon dioxide and more oxygen than air breathed in.
- Air breathed out has less carbon dioxide and less oxygen than air breathed in.
- Air breathed out has more carbon dioxide and less oxygen than air breathed in.
- Air breathed out has more carbon dioxide and more oxygen than air breathed in.
Answer:
the third one
Explanation:
When you breathe in, you inhale oxygen and exhale carbon dioxide
How do scientists plan for missing bones?
Answer:
scientist never ignore the missing -parts of body
Explanation:
they take the missing bones as an opportunity to look into them as practical for pre medical student ,they are very costly sealed
the atomic number of fluorine is 9. how many electrons are contained in the second principal
The second principal energy level of fluorine contains 7 electrons.
To determine the number of electrons in the second principal energy level of an atom, we need to understand the electron configuration. The electron configuration of fluorine (F) is 1s² 2s² 2p⁵.
The first principal energy level (n = 1) contains 2 electrons (1s²), which completely fills it. The second principal energy level (n = 2) can accommodate a maximum of 8 electrons.
In the case of fluorine, the 2s orbital is filled with 2 electrons, leaving 5 electrons in the 2p orbitals. Therefore, the second principal energy level of fluorine contains 7 electrons.
In summary, the second principal energy level of fluorine contains 7 electrons based on its electron configuration.
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If 8.2mol of hydrogen is produced, how many moles of hydrofluoric acid (HF) reacted? (Round to the nearest tenth)\(Si + 4HF -\ \textgreater \ 2H2 + SiF4\)
Answer:
18.53
Explanation:
just finished and passed
Most of the deserts on the Earth are located around 30°N & 30°S latitude. This is because air is ( rising / sinking ) at these locations.
Answer: We live at the bottom of a gaseous envelope the atmosphere--that is bound gravity to the planet Earth. The circulation of our atmosphere is a complex process because of the Earth's rotation and the tilt of its axis. The Earth's axis is inclined 23.5° from the ecliptic, the plane of the Earth's orbit around the Sun. Due to this inclination, vertical rays of the Sun strike 23.5° N. latitude, the Tropic of Cancer, at summer solstice in late June. At winter solstice, the vertical rays strike 23.5° S. Latitude, the Tropic of Capricorn. In the Northern Hemisphere, the summer solstice day has the most daylight hours, and the winter solstice has the fewest daylight hours each year. The tilt of the axis allows differential heating of the Earth's surface, which causes seasonal changes in the global circulation. On a planetary scale, the circulation of air between the hot Equator and the cold North and South Poles creates pressure belts that influence weather. Air warmed by the Sun rises at the Equator, cools as it moves toward the poles, descends as cold air over the poles, and warms again as it moves over the surface of the Earth toward the Equator. This simple pattern of atmospheric convection.
7420 joules of heat is added to an unknown sample with a mass of 1.3 kg. Thetemperature increases by 2.36 °C. What is the material likely made out of?
So, using the formula:
\(Q=mc\Delta T\)We could replace the values of the question:
\(7420J=1.3Kg\cdot c\cdot2.36C\)Given that "c" is the specific heat of the substance, we could find it solving the previous equation:
\(c=\frac{7420J}{1.3Kg\cdot2.36C}=\frac{2418.51J}{Kg\cdot C}\)If we look, this specific heat corresponds likely to Glycerine. That's because glycerine has a specific heat equals 2410J/KgC , and this value is extremely similar to the value that we found.
Still using the reaction from the video, what is the limiting reagent when 2 moles of Al are reacted
with 2 moles of O₂? About how many total reactions can you run?
O Al, 0.67 reactions
O Al, 0.5 reactions
Oxygen, 0.67 reactions
O Oxygen, 0.5 reactions
The limiting reagent will be Al
What are limiting reagents?They are reagents that limit the quantity of products that are formed in reactions.
From the equation of the reaction:
\(4Al + 3O_2 --- > 2Al_2O_3\)
The mole ratio of Al to O2 is 4:3.
With 2 moles of Al and 2 moles of O2, Al becomes limiting while O2 is in excess.
With 2 moles of O2, the amount of Al required should be:
2 x 4/3 = 2.67 moles.
With 2 moles of Al, the amount of O2 required should be:
2 x 3/4 = 1.5 moles
Thus, O2 is in excess by 0.5 moles.
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4. Manik saw his father watering his garden plants in hot weather. He noticed that
water doesn’t stick to the plant leaves and leaves become dry but looked fresh. He asked
following questions to his teacher
a. Which tissue forms the outer covering of a plant and does it have a protective role
to play?How ?
b. Why does water not stick to the leaves?
Water does not stick to the leaves of the plant owing to the fact that the leaves has a waterproof cuticle.
What tissues protects the leaves?We know that the leaves are the parts of the plant that are involved in photosynthesis. Photosynthesis is the process by which green plants produce their own food in the presence of sunlight and chlorophyll. We know that the leave has an outer protective covering.
The tissue that plays this outer covering of a plant for is the epidermis and its waxy cuticle. It prevents damage to the plant.
Water does not stick to the leaves of the plant owing to the fact that the leaves has a waterproof cuticle.
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Surrounding
Reaction A
Reaction B
Temperature
Initial Temp
25.1°C
25.1°C
Final Temp
30.2°C
20.0°C
Using the data above, which statement is a correct interpretation of the chemical
reactions
Reaction A was endothermic and reaction B was exothermic.
Reaction A was exothermic and reaction B was endothermic.
O Both reactions were endothermic.
Both reactions were exothermic.
Based on the data given in this question, the statement that shows a correct interpretation of the chemical reactions is as follows: reaction A was exothermic and reaction B was endothermic.
What are endothermic and exothermic reactions?Endothermic reaction is a chemical reaction that absorbs heat energy from its surroundings while exothermic reaction is a reaction that releases energy in the form of heat.
Endothermic reactions leave their surroundings cooler while exothermic reactions leave their surroundings hotter.
According to this question, the initial and final temperatures of two reactions are given as follows:
Reaction A: 25.1°C and 30.2°CReaction B: 25.1°C and 20.0°CFrom the above data, reaction A was exothermic because it increased the surrounding temperature and reaction B was endothermic because it reduced the surrounding's temperature.
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if a reaction takes place using all oxygen available and leaving hydrogen available:
Answer:
If a reaction takes place using all oxygen available and leaving hydrogen available, then oxygen is the limiting reactant.
Explanation:
The reaction used up all the oxygen and left over some hydrogen, so oxygen is the liting reactant.
Write a balanced chemical equation for the following
1.) SnO₂ + C → CO + Sn
dsg-d34-2sn
Explanation:
the new verge of 23 us 27b fub co+ sn + sno2
The solubility of sodium chloride decreases as temperature increases.
True
False
Yes the increase in temperature of sodium chloride will cause a decrease in it solubility.
Answer is True
Solubility of Sodium ChlorideSodium chloride is a type of salt whose solubility decreased with increased temperature, this is quite unusual to other solute.
With the case of Sodium Chloride, this principle is applied in purifications like re-crystallization which is used to recover solute in solvents
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Write the balanced chemical equation for the combustion of docosane C22H46.
Please help!! :(
if 0.313 g of na2co3 completely reacted with 0.235 m hcl, what was the volume of hcl solution consumed in ml?
It will take 28.57 mL of HCl to complete the reaction. The quantity of space that anything occupies is measured by its volume. Various items, including cups of wheat, gallons of milk, and cubic feet of helium
What does a liquid's volume mean?
The volume of liquid that a vessel holds is measured in standard units as the liquid measurement. It is sometimes referred to as the vessel's "volume" or "capacity."
What are mass and volume?
A three-dimensional object's volume is the area it takes up, and it is expressed in cubic units. Cm3 and in3 are two examples of cubic units. The amount of substance in an item may be determined by its mass, on the other hand.
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Why is group 17 more reactive than Group 16?
The group 17 elements need only one more electron to complete a full octet since they already possess seven valence electrons. whereas group 16 elements needs 2 more electrons that why group 17 more reactive than Group 16
Because they easily acquire an electron to complete their outermost shell, halogens were highly reactive. Since they easily shed the solitary electron in their outermost shell, alkali metals were very reactive.
Since they easily acquire an electron to complete their outermost shell, halogens were highly reactive. Although they easily lose the lone electron within their outermost shell, alkali metals were highly reactive.
Group 17 elements occur only require one electron, therefore they can easily borrow an electron from another element to achieve a stable configuration for a noble gas. They were hence very reactive as well as will rapidly receive an electron to complete their outermost shell.
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What Element am I?
I have 5 Valence Electrons.
I am in the 5th row.
My atomic mass is less than Bismuth *
с
Answer:
Nitrogen
Explanation:
Nitrogen has 5 Valence Electrons.
And its atomic mass is also less than Bismuth.
There are other elements in the 5th row but this one has the lowest atomic mass compared to the others.
2.A plant's leaves are green because the color green is back to our eyes. *
O A. Absorbed
OB. Reflected
O C. Transmitted
O D. All of the above
In order for a reaction to occur, which action must happen?(1 point) Molecules must divide at a high enough energy to break bonds. Molecules must divide at a high enough energy to break bonds. Molecules must collide at a low enough energy to break bonds. Molecules must collide at a low enough energy to break bonds. Molecules must divide at a low enough energy to break bonds. Molecules must divide at a low enough energy to break bonds. Molecules must collide at a high enough energy to break bonds
Based on effective collision, in order for a reaction to occur, molecules must collide at a high enough energy to break bonds.
What are effective collisions?Effective collision are collision between reactant particles which result in the formation of product from reactant molecules.
For effective collisions to occur, the reactant molecules must possess a minimum amount of energy known as activation energy which is required to break the bonds present in the reactant molecules.
Therefore, in order for a reaction to occur, molecules must collide at a high enough energy to break bonds.
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Answer:
1.) Molecules must collide at a high enough energy to break bonds.
2.) the minimum amount of energy required to break bonds and start a chemical reaction
3.) Which change can encourage a reaction? adding heat
4.) More energy is released when forming the bonds of the products because a lot of heat is given off, which indicates energy was released.
5.) Two H–H bonds are broken, one O=O bond is broken, and four H–O bonds are
formed.Explanation:
^^ (be carefull with the last question, the answers look very similar)
A buffer solution is made by adding 25.7 ml of 4.1 M NaOH to 215.0 mL of a weak acid HA. The pka of HA is 4.09. The activity coefficient of the weak acid is 0.88, and the activity coefficient of the weak base is 0.77. The pH of the resulting solution is 4.35. Remember that NaOH is a strong base and will therefore be considered to dissociate completely. What is the concentration of the HA solution before AND after the NaOH was added? Please show work for both concentrations.
The balanced chemical equation for the dissociation of a weak acid is: HA(aq) + H2O(l) ⇌ H3O+(aq) + A-(aq). The initial concentration of weak acid is 0.49M. The concentration of the HA solution after the NaOH was added is 0.277 M.
What is a buffer solution?A buffer solution is a solution that resists a change in pH. It contains a weak acid and its corresponding conjugate base, or a weak base and its corresponding conjugate acid. There are two types of buffer solutions: acidic buffer solutions and basic buffer solutions. According to the question, the volume of the NaOH solution is 25.7 mL, the molarity of NaOH solution is 4.1 M, and the volume of the weak acid HA is 215 mL.
To determine the initial concentration of the weak acid HA, the number of moles of NaOH added must first be calculated. Using the molarity of NaOH and its volume:
Moles of NaOH = Molarity × Volume= 4.1 M × 0.0257 L= 0.1056 mol
Next, it is necessary to determine how many moles of HA were present before the NaOH was added. Because the NaOH is a strong base, it will react completely with the weak acid HA to produce its conjugate base A-. The amount of weak acid HA consumed will be equal to the amount of NaOH added.
Moles of HA consumed = Moles of NaOH= 0.1056 mol
The volume of the weak acid HA solution is 215 mL.
Convert this volume to liters:215 mL = 0.215 L
The initial concentration of the weak acid HA can be calculated as follows:
Initial concentration = Moles / Volume= 0.1056 mol / 0.215 L= 0.49 M
A balanced chemical equation is necessary to calculate the new concentration of the weak acid HA. The balanced chemical equation for the reaction between NaOH and HA is:
HA(aq) + NaOH(aq) → H2O(l) + NaA(aq)
Moles of NaA produced = Moles of NaOH= 0.1056 mol
The volume of the solution is the sum of the volumes of the weak acid HA and the NaOH. Convert the volume of the NaOH solution to liters:
25.7 mL = 0.0257 L
Total volume = 0.215 L + 0.0257 L= 0.2417 L
The number of moles of HA remaining can be calculated using the moles of HA consumed and the moles of NaA produced:
Moles of HA remaining = Moles of HA – Moles of NaA= 0.1056 mol – 0.1056 mol= 0 M
The number of moles of A- produced is equal to the number of moles of NaOH added because the acid and the base react in a 1:1 ratio.
Moles of A- produced = Moles of NaOH= 0.1056 mol
The new concentration of A- is then calculated:
New concentration = Moles / Volume= 0.1056 mol / 0.2417 L= 0.436 M
Next, we need to calculate the new concentration of HA. We can use the Henderson-Hasselbalch equation:
pH = pKa + log ([A-]/[HA])
Rearrange this equation and solve for [HA]:
[HA] = [A-] × 10^(pH - pKa)
Substituting the known values:
pH = 4.35pKa = 4.09[A-] = 0.436[HA] = 0.436 × 10^(4.35 - 4.09)= 0.277 M
Therefore, the concentration of the HA solution after the NaOH was added is 0.277 M.
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What are the two differences between mass and weight?
name the alkene using the 1993 iupac convention. spelling and punctuation count!
The name of the alkene using the 1993 IUPAC convention is 4-isopropyl-1-methylcyclohexene. The IUPAC nomenclature of organic chemistry is a systematic method of naming organic chemical compounds.
For the names to be unambiguous and for the name to give a clue about the structure of the compound, these names have been standardized. There are two main classes of hydrocarbons that are classified as: alkanes and alkenes.
An alkene is a hydrocarbon with at least one double bond between adjacent carbon atoms. Alkenes are hydrocarbons with a carbon-carbon double bond and have the molecular formula CnH₂n. An alkene is known by replacing the -ane suffix of an alkane with -ene. The location of the double bond is defined by the position of the first carbon atom involved in the double bond.
The numbering of the carbon atoms in the alkene must begin with the carbon atom that is closest to the carbon atoms involved in the double bond. According to IUPAC rules, the number of the first carbon atom in the double bond is used as a prefix to the parent chain. In the case of cyclic hydrocarbons, the suffix -ene is added after the prefix cyclo-.Given, the structure of the alkene is provided in the below figure: Since the alkene has a double bond between the first and second carbon atoms of the cyclohexene, the IUPAC name should begin with the word "cyclo-." Therefore, the parent name of the alkene is cyclohexene.
Now, let's move on to the substituents attached to the parent chain. In the molecule, there are two substituents are present which are: a methyl group (-CH₃) attached at the first carbon atom and an isopropyl group (CH(CH₃)₂) attached at the fourth carbon atom. These groups are named as substituents and are written as prefixes to the parent name. The order of listing the substituents depends on the alphabetical order of the substituent's name. Therefore, the name of the alkene using the 1993 IUPAC convention is 4-isopropyl-1-methylcyclohexene.
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The arrangement of particles is most ordered in a sample of
1.
NaCl(aq)
2.
NaCl(l)
3.
NaCl(g)
4.
NaCl(s)
PLEASE HELP
We have that the arrangement of particles of NaCl is most ordered in a sample of
NaCl(s)
i.e solid NaCl
From the question we are told
The arrangement of particles is most ordered in a sample of
1. NaCl(aq)
2. NaCl(l)
3. NaCl(g)
4. NaCl(s)
NaCl Generally known as sodium chloride or salt exist in four main states as shown
1. NaCl(aq)
2. NaCl(l)
3. NaCl(g)
4. NaCl(s)
Mow in a subject of its arrangement of particles we can see that as its state changes from gaseous through to solid it gains in form and arrangement of particles
Therefore
The arrangement of particles of NaCl is most ordered in a sample of
NaCl(s)
i.e solid NaCl
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Which of these statements is false?
A. Electrons have a negative charge
B. Electrons have a mass of 1 amu
C. The nucleus of an atom is positively charged
D. The neutron is found in the nucleus of an atom
Answer:
The answer is b
Explanation:
Hope it helps
b) electrons have a mass of 1 amu
electrons have a mass of 0 amu
how many neutrons are in a neutral atom of lithium
Answer:
4?
Explanation:
In general, the Hippocratic Oath requires physicians to do all of the following EXCEPT which action?
treat every ill patient
do no harm
help their patients as best they can
maintain the privacy of their patients
Answer:
Physicians do not have to treat every ill patient. However they must uphold their ethics (eg. do no harm, confidentiatlity, etc.).
Explanation:
Primary source:
Hippocratic Oath (translation since it's originally in Greek)
I swear by Apollo the physician, and Asclepius, and Hygieia and Panacea and all the gods and goddesses as my witnesses, that, according to my ability and judgement, I will keep this Oath and this contract:
To hold him who taught me this art equally dear to me as my parents, to be a partner in life with him, and to fulfill his needs when required; to look upon his offspring as equals to my own siblings, and to teach them this art, if they shall wish to learn it, without fee or contract; and that by the set rules, lectures, and every other mode of instruction, I will impart a knowledge of the art to my own sons, and those of my teachers, and to students bound by this contract and having sworn this Oath to the law of medicine, but to no others.
I will use those dietary regimens which will benefit my patients according to my greatest ability and judgement, and I will do no harm or injustice to them.
I will not give a lethal drug to anyone if I am asked, nor will I advise such a plan; and similarly I will not give a woman a pessary to cause an abortion.
In purity and according to divine law will I carry out my life and my art.
I will not use the knife, even upon those suffering from stones, but I will leave this to those who are trained in this craft.
Into whatever homes I go, I will enter them for the benefit of the sick, avoiding any voluntary act of impropriety or corruption, including the seduction of women or men, whether they are free men or slaves.
Whatever I see or hear in the lives of my patients, whether in connection with my professional practice or not, which ought not to be spoken of outside, I will keep secret, as considering all such things to be private.
So long as I maintain this Oath faithfully and without corruption, may it be granted to me to partake of life fully and the practice of my art, gaining the respect of all men for all time. However, should I transgress this Oath and violate it, may the opposite be my fate.