plsssss help with this ill give brainliest to first answer
How does the concept of conservation of mass apply to chemical reactions?
Answers
Answer:
The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
Related Questions
What is the final temperature of the gas that expands from a volume of 22.4 l at 278k to a volume of 38.3 l?
Answers
The final temperature of the gas that expands from a volume of 22.4 l at 278k to a volume of 38.3 l will be 475 K.
The volume as well as Kelvin temperature will be directly proportional whenever the pressure on even a sample of such a dry gas remains held constant. PV = k would be the law's equation.
Charle's law give the relation between the temperature and volume is shown as:
\(V_{1} / T_{1} = V_{2} / T_{2}\)
where. V is volume and T is temperature.
Given data :
\(V_{1} =22.4 l\\V_{2} = 38.3 l\\T_{1} = 278 K\\T_{2} = ?\)
Put the value of given data in above equation.
22.4 l / 38.3 l = 278k / \(T_{2}\)
\(T_{2}\) = 475 K.
Therefore, the final temperature will be 475 K.
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Engineering Question 15 of 30 Which of the following devices is used for atomizing and vaporizing the fuel before mixing it with air in varying proportions? O Spark plug O Carburetor O Flywheel Govern
Answers
The primary goal of the carburetor is to atomize and vaporize the fuel before mixing it with air in varying proportions, making it the device that is used for atomizing and vaporizing the fuel before mixing it with air in varying proportions.
The device that is used for atomizing and vaporizing the fuel before mixing it with air in varying proportions is Carburetor. A carburetor is a device that blends air and fuel for an internal combustion engine. It is often located on the top of an engine on a direct engine-to-carburetor link, and it controls how much air and fuel are mixed.The carburetor must also supply the engine with a spark plug to ignite the fuel/air mixture in each cylinder.
The carburetor must provide a fuel/air mixture that is consistent with the engine's changing demands, which vary with engine speed, load, and temperature. A carburetor is responsible for enriching the fuel/air mixture when the engine is cold and for leaning the mixture as the engine warms up. As well, it is also responsible for regulating the fuel/air mixture at part-throttle levels, where the engine spends most of its time when driving.
When an engine is running at full throttle, it is operating at wide-open throttle (WOT), and the carburetor provides the richest fuel/air mixture possible.The carburetor, like most engine systems, is a complex and sensitive device that must be correctly tuned to perform properly. The primary goal of the carburetor is to atomize and vaporize the fuel before mixing it with air in varying proportions, making it the device that is used for atomizing and vaporizing the fuel before mixing it with air in varying proportions.
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In the following reaction which reaction oxidized and which reactamt is reduced? Mg(s) +Cu^2+(aq) Mg^2+(aq)+Cu(s)
Answers
The Mg atoms in the solid magnesium (Mg) are oxidized because they lose electrons to form Mg2+ ions in the aqueous solution. The Cu2+ ions in the aqueous solution are reduced because they gain electrons to form solid copper (Cu).
So, the Mg atoms are oxidized and the Cu2+ ions are reduced in this reaction. This is a long answer that provides a clear explanation of which reactant is oxidized and which is reduced in the given chemical reaction.
In the reaction Mg(s) + Cu^2+(aq) → Mg^2+(aq) + Cu(s), the reactant that is oxidized is Mg(s) and the reactant that is reduced is Cu^2+(aq).
1. Identify the oxidation states of the elements in the reactants and products: Mg has an oxidation state of 0, Cu^2+ has an oxidation state of +2, Mg^2+ has an oxidation state of +2, and Cu has an oxidation state of 0.
2. Determine the change in oxidation states: Mg goes from 0 to +2 (an increase in oxidation state), and Cu^2+ goes from +2 to 0 (a decrease in oxidation state).
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Did you title your lab report?
Did you state the purpose of the investigation?
Did you include a brief overview of the investigation?
Materials and Procedure
Did you make a list of materials? Did you include quantities and SI units?
Did you present the steps of the procedure as a numbered list?
Did you note any changes to the original procedure?
Answers
Identify the following as an example of a physical or chemical. Olive oil, vinegar, salt, and pepper are shaken together together to make salad dressing
Answers
Answer:
Chemical Change
Explanation:
Mixing these elements together creates a chemical change
Making of a salad dressing is a physical change as there is no change in the chemical composition.
What is a physical change?
Physical changes are defined as changes which affect only the form of a substance but not it's chemical composition. They are used to separate mixtures in to chemical components but cannot be used to separate compounds to simpler compounds.
Physical changes are always reversible using physical means and involve a change in the physical properties.Examples of physical changes include melting,boiling , change in texture, size,color,volume and density.Magnetism, crystallization, formation of alloys are all reversible and hence physical changes.
They involve only rearrangement of atoms and are often characterized to be changes which are reversible.
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Bombardier beetles release a burst of hot chemical spray with a popping sound. The chemical is sprayed from a structure present under the belly of the beetles.
Which is the likely advantage of such a behavior?
It allows the beetles to attract mates.
It allows the beetles to move obstacles out of their paths.
It allows the beetles to escape from predators.
It allows the beetles to stay warm in cold conditions.
Answers
It allows the beetles to escape from predators
is a condition characterized by an overactive thyroid gland.
A. Acromegaly
B. Dwarfism
C. Diabetes insipidus
D. A goiter
Answers
A pool owner adds a compound containing chlorine to the pool to disinfect it. However, too much of the compound is added. As a result, the water becomes too acidic. What could the pool owner do to reduce the acidity of the pool
Answers
The question is incomplete, the complete question is;
A pool owner adds a compound containing chlorine to the pool to disinfect it. However, too much of the compound is added. As a result, the water becomes too acidic. What could the pool owner do to reduce the acidity of the pool?
He could add another acid to the pool to compete with the existing acid.
He could add a metal salt to the pool to precipitate the acid.
He could add a base to the pool to neutralize the acid.
Answer:
He could add a base to the pool to neutralize the acid.
Explanation:
The reaction between an acid and a base is called a neutralization reaction. A neutralization reaction is defined as a reaction between an acid and a base leading to the formation of salt and water only.
If the owner of the pool discovers that the pool has become too acidic, all that needs to be done is to introduce a base into the pool that will neutralize the acid according to the reaction;
Acid + base ------> salt + water
What is considered the human body's largest organ?
Answers
Answer:
The skin
Explanation:
The skin is the largest organ of the body. The skin and its derivatives (hair, nails, sweat and oil glands) make up the integumentary system. One of the main functions of the skin is protection. It protects the body from external factors such as bacteria, chemicals, and temperature.
which phrase explains the apparent motions of planets in the night sky?
Answers
The east to west daily motions of stars, planets, the Moon, and the Sun are caused by the rotation of the Earth on its axis. The Earth and all the planets revolve around the Sun on circular orbits. This produces the change in constellations observed from one time of year to the next.
hope it helps..!!!
convert eachh into scientific notation
4.060 x 10^5 →
7 x 10^3 →
5.0 x 10^-4 →
8 x 10^-2 →
Answers
Answer:
0.00580 →
3000 →
0.000908 →
200. →
Explanation:
yay
Answer:
\(\large \boxed{\mathrm{view \ explanation}}\)
Explanation:
4.060 × 10⁵ (scientific notation)
The decimal point moves 5 places to the right.
⇒ 406000 (standard form)
7 × 10³ (scientific notation)
The decimal point moves 3 units to the right.
⇒ 700 (standard form)
5.0 × 10⁻⁴ (scientific notation)
The decimal point moves 4 units to the left.
⇒ 0.0005 (standard form)
8 × 10⁻² (scientific notation)
The decimal point moves 2 units to the left.
0.08 (standard form)
In which orbitals would the valence electrons for carbon (C) be placed?
Answers
Answer: orbitals supernumerary
Explanation:
Answer:
both S orbital and p orbitals
Explanation:
took the exam got the question right.
The diagram shows a model of an animal cell. Explain how you'd modify the model to show the structures in a plant cell.
Answers
Answer:to show the structures of a plant cell,add a cell wall around the membrane and increase the size of the vaculoe insidethe cell, draw green ovals to represent chloroplasts.
Explanation:
Your tank of alkali fish needs a ph of 8, and the ph is 6 at present. what should you do to the h concentration?
Answers
To obtain pH 8, multiply the [H+] concentration at pH 6 by 0.01
How to determine the hydrogen ion concentration, [H+] at pH 8From the question given above, the following data were obtained:
pH = 8Hydrogen ion concentration [H+] =?pH = –Log [H+]
8 = –Log [H+]
Multiply through by –1
–8 = Log [H+]
Take the anti-log of –8
[H+] = anti-log (–8)
[H+] = 1×10⁻⁸ M
How to determine the hydrogen ion concentration, [H+] at pH 6pH = 8Hydrogen ion concentration [H+] =?pH = –Log [H+]
6 = –Log [H+]
Multiply through by –1
–6 = Log [H+]
Take the anti-log of –6
[H+] = anti-log (–6)
[H+] = 1×10⁻⁶ M
Comparison of [H+] at pH 6 and pH 8[H+] at pH 6 = 1×10⁻⁶ M[H+] at pH 8 = 1×10⁻⁸ M[H+] at pH 8 / [H+] at pH 6 = 1×10⁻⁸ / 1×10⁻⁶
[H+] at pH 8 / [H+] at pH 6 = 0.01
Cross multiply
[H+] at pH 8 = 0.01 × [H+] at pH 6
Thus, to obtain pH 8, multiply the [H+] at pH 6 by 0.01
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Carbon monoxide and oxygen react to produce carbon dioxide. If 75.3L of carbon monoxide and 38.0L of oxygen are used, how many grams of carbon dioxide could be made? Which molecule is the limiting reactants? How much is left over
Answers
Approximately 148.59 grams of carbon dioxide could be made.The remaining reactant, since \(O_2\)is the limiting reactant, all the CO will not be completely consumed. There would be no CO leftover as it is completely consumed in the reaction.
To determine the grams of carbon dioxide produced, we need to identify the limiting reactant first. The balanced chemical equation for the reaction is:
2 CO +\(O_2\) -> 2 \(CO_2\)
To find the limiting reactant, we compare the number of moles of each reactant and determine which one is present in a lower amount relative to the stoichiometry of the reaction.
First, we convert the given volumes of gases to moles using the ideal gas law equation:
n = PV / RT
where:
n = number of moles
P = pressure
V = volume
R = ideal gas constant
T = temperature
Assuming the reaction takes place at standard temperature and pressure (STP), which is 273.15 K and 1 atm, we can use the values to convert the volumes to moles:
For carbon monoxide (CO):
n(CO) = (75.3 L) / (22.414 L/mol) = 3.36 moles
For oxygen (O2):
n(O2) = (38.0 L) / (22.414 L/mol) = 1.69 moles
According to the balanced equation, the stoichiometry of the reaction is 2:1 for CO to \(O_2\)This means that for every 2 moles of CO, we need 1 mole of \(O_2\). In this case, the ratio of moles is 3.36:1.69, which shows an excess of CO.
To find the limiting reactant, we compare the mole ratio to the stoichiometry ratio. Since there is a surplus of CO, it is the excess reactant, and\(O_2\)is the limiting reactant.
To determine the amount of carbon dioxide produced, we use the stoichiometry of the reaction. From the balanced equation, we know that for every 2 moles of CO, 2 moles of CO2 are produced.
Since\(O_2\) is the limiting reactant, we use its moles to calculate the moles of \(Co_2\)produced:
n(\(CO_2\)) = 2 * n(\(O_2\)) = 2 * 1.69 moles = 3.38 moles
Finally, we convert the moles of\(CO_2\) to grams using the molar mass of carbon dioxide, which is 44.01 g/mol:
mass(\(CO_2\)) = n(\(CO_2\)) * molar mass(\(CO_2\) = 3.38 moles * 44.01 g/mol ≈ 148.59 grams
Therefore, approximately 148.59 grams of carbon dioxide could be made.
As for the remaining reactant, since \(O_2\)s the limiting reactant, all the CO will not be completely consumed. To determine the amount of CO leftover, we subtract the moles of CO used from the initial moles of CO:
Remaining moles of CO = Initial moles of CO - Moles of CO used
Remaining moles of CO = 3.36 moles - 2 * 1.69 moles ≈ 0 moles
Thus, there would be no CO leftover as it is completely consumed in the reaction.
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What kind of dog is a Karen?
Answers
A female one. That's all.
True or false?
A limitinh factor is an environmental factor that increases the growth of a population
True or false?
Biomes are characterized by temperature, precipitation, and the plant and animal communities that live there
Answers
1 - F
2- T
2 True
Good luck!!
How many moles of AgNO3 are needed to prepare 452 mL of a 2.3 M solution?
Answers
Answer: To determine the number of moles of AgNO3 needed to prepare a 2.3 M solution in 452 mL, we can use the formula:
moles = concentration (M) x volume (L)
First, we need to convert the volume from milliliters to liters by dividing by 1000:
452 mL ÷ 1000 mL/L = 0.452 L
Next, we can plug in the values we know:
moles = 2.3 M x 0.452 L
moles = 1.0416
Therefore, we need 1.0416 moles of AgNO3 to prepare a 2.3 M solution in 452 mL.
Bainliest. Mole Conversion
Using dimensional analysis determine how many moles are present in 125g of Oxygen gas. O = 16.0 g/mol (3 sig figs)
Answers
Answer:
125g × 1 mol/16 grams = 7.81 × avogadros #
Which of the following functional groups CANNOT hydrogen bond with itself? (select all) 1) Ethers 2) Tertiary amines 3) Esters 4) Carboxylic acids
Answers
Among the given options, the functional group that cannot hydrogen bond with itself is: 1) Ethers Ethers, which have the general formula R-O-R', consist of two alkyl or aryl groups bonded to an oxygen atom.
While oxygen is capable of forming hydrogen bonds with hydrogen atoms from other functional groups, ethers themselves do not have hydrogen atoms directly bonded to the oxygen atom. As a result, ethers lack the necessary hydrogen bonding donor or acceptor sites required for intermolecular hydrogen bonding.
2) Tertiary amines: Although they lack a hydrogen atom directly bonded to the nitrogen atom, they can still participate in hydrogen bonding as hydrogen bond acceptors.
3) Esters: The oxygen atom in the ester functional group can act as both a hydrogen bond donor and acceptor, enabling intermolecular hydrogen bonding.
4) Carboxylic acids: Carboxylic acids have a hydrogen atom bonded to the oxygen of the carboxyl group, making them capable of forming hydrogen bonds with other carboxylic acid molecules through the oxygen and hydrogen atoms.
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6
What is the density of a substance that has a mass of 2.0 g, and when placed in a graduated cylinder
the volume changed from 70 mL to 75 mL?
A 2.5 g/mL
B 7.0 g/mL
C 10. g/mL
D 0.40 g/mL
Answers
The density of the substance having a mass of 2.0 g is 0.4 g/mL (Option D)
How do I determine the density of the substance?First, we shall obtain the volume of the substance. This can be obtained as follow:
Volume of water = 70 mL Volume of water + substance = 75 mL Volume of substance =?Volume of substance = (Volume of water + substance) - (Volume of water)
Volume of substance = 75 - 70
Volume of substance = 5 mL
Finally, we shall determine the density of the substance. This is illustrated below:
Mass of substance = 2.0 gVolume of substance = 5 mLDensity of substance = ?Density = mass / volume
Density of substance = 2 / 5
Density of substance = 0.4 g/mL
Thus, the density is 0.4 g/mL (Option D)
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Tracy: Macromolecules are large molecules. 'Macro' means large, and 'molecules refers to atoms held together
by chemical bonds. Which of the following molecules is NOT a macromolecule? a) Lipid b) Glucose c)
Carbohydrates d) Protein
Answers
The molecule that is NOT a macromolecule is glucose (option b). The correct option is b).
Macromolecules are characterized by their large size, often composed of repeating subunits called monomers. They are formed through polymerization, where monomers are joined together by chemical bonds. Examples of macromolecules include proteins, nucleic acids, carbohydrates, and lipids.
Lipids (option a) can be considered macromolecules, specifically when they form structures such as triglycerides or phospholipids. These structures consist of long hydrocarbon chains and are involved in energy storage and membrane formation.
Carbohydrates (option c) are macromolecules that consist of monosaccharide units joined together through glycosidic bonds. Examples include polysaccharides like starch and cellulose.
Proteins (option d) are macromolecules composed of amino acid monomers linked by peptide bonds. They have diverse functions in the body, including enzyme catalysis, structural support, and signaling.
On the other hand, glucose is a monosaccharide and not considered a macromolecule. It is a simple sugar and a fundamental unit of carbohydrates. Glucose molecules can link together to form larger carbohydrates such as disaccharides (e.g., sucrose) and polysaccharides (e.g., glycogen). However, glucose itself is not a macromolecule.
Therefore, among the options provided, glucose (option b) is the answer.
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when using a water-cooled condenser, the water should choose... the condenser. to make this happen, the water should flow in at the choose... and should flow out at the choose... .
Answers
When using a water-cooled condenser, the water should constantly move over the condenser. to make this happen, the water should flow in at the bottom part and should flow out at the top part.
Water cooled condenser is heat exchanger. it will removes heat from the refringent and transfer to the water running through. The advantages of this system is it is lasts year longer. it has higher heat transfer rate
Thus, When using a water-cooled condenser, the water should constantly move over the condenser. to make this happen, the water should flow in at the bottom part and should flow out at the top part.
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In a science experiment, 10 tomato plants were given fertilizer in their water each week and 10 tomato plants were given plain water each week. All other factors were the same for all plants. At the end of each week, the height of each plant was measured. What was the independent and dependent in the experiment?
1. the height of the plant
2. the amount of water given
3. the type of plant
4. whether or not there was fertilizer in the water
Answers
Answer:
Independent: whether or not there was fertilizer in water
Dependent: height of plants
Explanation:
In an experiment, there is an independent and a dependent variable. The independent variable is what is changed in the experiment. The dependent variable is what is measured.
In this experiment, 10 tomato plants are given fertilizer in the water, while 10 other tomato plants are given regular water. Everything else is kept constant, and the heights are measured at the end of the week.
The independent variable is what is being changed. In this experiment, the only thing being manipulated is the fertilizer. One group of the plants is given fertilizer, while the other is not. Therefore, the independent variable is whether or not there was fertilizer in the water.
The dependent variable is what is being measured. In this experiment, the thing that is being measured is the height of the plants. Therefore, the dependent variable is the height of the plants.
Separation units often use membranes, absorbers, and other devices to reduce the mole fraction of selected constituents in gaseous mixtures. Consider a mixture of hydrocarbons that consists of 62 percent (by volume) methane, 28 percent ethane, and 10 percent propane. After passing through a separator, the mole fraction of the propane is reduced to 1 percent. The mixture pressure before and after the separation is 100 kPa. Determine the change in the partial pressures of all the constituents in the mixture.
Answers
Answer:
See explanation
Explanation:
We first obtain the mole fraction of propane at the start and end;
0.01 = x/0.62 + 0.28 + x
0.01[0.62 + 0.28 + x] = x
0.01[0.9 + x] =x
9 * 10^-3 + 0.0.1x = x
9 * 10^-3 = x - 0.0.1x
9 * 10^-3 = 0.99x
x = 9 * 10^-3/0.99
x = 9.09 * 10^-3
After
For methane
0.62/ 0.28 + 0.62 + 9.09 * 10^-3 = 0.68
For ethane
0.28/0.28 + 0.62 + 9.09 * 10^-3 =0.31
Change in partial pressure of methane = (0.68 - 0.62) * 100kPa = 6 kPa
Change in partial pressure of ethane = (0.31 - 0.28) * 100kPa = 3 kPa
Change in partial pressure of propane= (0.01 - 0.1) * 100kPa = -9 kPa
Hydrochloric acid is usually purchased in concentrated form with a 37.0% HCL concentration by mass and a density of 1.20g/mL. How much of the concentrated stock solution in milliliters should you use to make 2.5L of 0.500M HCL
Answers
Hydrochloric acid is usually purchased in concentrated form with a 37.0% HCL concentration by mass and a density of 1.20g/mL. 8.46 mL is Concentration of stock solution.
To make 2.5L of 0.500M HCl solution, we need to calculate the amount of hydrochloric acid (HCl) required.
First, we need to use the equation \(M1V1=M2V2\), where M1 is the concentration of the concentrated stock solution, V1 is the volume of the concentrated stock solution we need to use, M2 is the desired concentration of the final solution, and V2 is the final volume of the solution we want to make.
Rearranging the equation, we get:
\(V1=\frac{M2V2}{M1}\)
Substituting the values we have:
V1 = (0.500 mol/L x 2.5 L) / (0.37 kg/L x 1000 g/kg x 1.20 g/mL)
V1 = 8.46 mL
Therefore, we need to use 8.46 mL of the concentrated stock solution to make 2.5L of 0.500M HCl solution.
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How much 0.3 m h2so4 is needed to neutralize 34.0 ml of a 0.25 m solution of naoh?
Answers
14.1 mL H₂SO₄ is needed to neutralize solution of NaOH.
Balanced chemical equation for neutralization reaction of sulfuric acid and sodium hydroxide:
H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O
c(H₂SO₄) = 0.3 M = 0.3 mol/L; concentration of sulfuric acid
V(NaOH) = 34.0 mL = 0.034 L; volume of sodium hydroxide
c(NaOH) = 0.25 M = 0.25 mol/L; concentration of sodium hydroxide
n(NaOH) = c(NaOH) × V(NaOH)
n(NaOH) = 0.25 mol/L × 0.034 L.
n(NaOH) = 0.0085 mol; amount of sodium hydroxide
From chemical reaction: n(H₂SO₄) : n(NaOH) = 1 : 2.
n(H₂SO₄) = 0.0085 mol ÷ 2
n(H₂SO₄) = 0.00425 mol; amount of sulfuric acid
V(H₂SO₄) = n(H₂SO₄) ÷ c(H₂SO₄).
V(H₂SO₄) = 0.00425 mol ÷ 0.3 mol/L.
V(H₂SO₄) = 0.0141 L = 14.1 mL; volume of sulfuric acid
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A piece of cork has a volume of 35.5 milliliters, ml. what is the mass of the piece of cork in grams, g?
Answers
The mass of the piece of cork is determined by its density, which can vary depending on the specific type of cork.
To calculate the mass of the piece of cork, we need to know its density. Density is defined as the mass per unit volume of a substance. However, the question only provides the volume of the cork, which is 35.5 milliliters (ml). Without the density, we cannot directly determine the mass.
To find the mass, we need to multiply the volume by the density of the cork. Density is typically expressed in grams per milliliter (g/ml) or grams per cubic centimeter (g/cm³). Once we have the density, we can use the formula:
Mass (g) = Volume (ml) x Density (g/ml)
Without information about the density of the cork, we cannot accurately calculate its mass. Therefore, we need additional data or specifications to proceed with the calculation.
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why did plants perform cellular respiration?
Answers
Answer:process of cellular respiration allows plants to break down glucose into ATP. ... Although plants use photosynthesis to produce glucose, they use cellular respiration to release energy from the glucose.
Explanation:
To find the number of neutrons we have to subtract Atomicnumber - Mass number
O True
O False
Answers
When calculating the number of neutrons you subtract the mass number from the atomic number?
Since the vast majority of an atom's mass is found its protons and neutrons, subtracting the number of protons (i.e. the atomic number) from the atomic mass will give you the calculated number of neutrons in the atom. In our example, this is: 14 (atomic mass) – 6 (number of protons) = 8 (number of neutrons).