If you start a reaction with 12 grams of reactants, how much product should you expect according to the law of conservation of mass?

d) Depends on the type of reaction

In a closed system, which of the following statements is true during a chemical reaction?

c) The total mass within the system remains the same.

a) Mass can escape from the system.

b) Matter can enter or leave the system.

d) Energy is created within the system.

Which scenario describes an open system?

c) A reaction that occurs in an uncovered beaker.

a) A sealed jar where a reaction occurs without anything escaping.

b) A reaction that takes place in a tied balloon.

d) A reaction that occurs inside a pressurized container.

Which of the following statements about balancing chemical equations is correct?

b) You must change the coefficients so that the number of atoms is equal on both sides of the equation.

a) You can only change the subscripts in a formula to balance the equation.

c) The number of atoms on the reactant side can be different from the product side.

d) It is not necessary to balance chemical equations.

Which of the following options best describes the purpose of balancing a chemical equation?

c) Obey the law of conservation of mass by having the same number of atoms on both sides.

a) Ensure that the reactants have more atoms than the products.

b) Ensure that the products have different types of atoms than the reactants.

d) Make the chemical reaction faster.

According to the law of conservation of mass, which of the following statements is always true during a chemical reaction?

c) The total number of atoms remains the same, but they are rearranged.

b) The total mass of the products is less than the total mass of the reactants.

d) The mass of the reactants is destroyed.

Why does the mass remain the same before and after a chemical reaction in a closed system?

b) Because atoms are rearranged, but not created or destroyed.

c) Because atoms disappear during the reaction.

d) Because new atoms are created.

Which of the following options best explains what happens to atoms in a chemical reaction?

c) They rearrange to form new substances.

b) They are absorbed by the environment.

d) They disappear from the system.

A student burns 10 grams of paper in a closed container. The mass of the container and its contents after the reaction remains 10 grams. This is an example of:

b) The law of conservation of mass

a) The law of conservation of energy

d) A physical change, not a chemical one

In an open system, like a burning candle, why might it seem that the mass is decreasing?

c) Gases like carbon dioxide and water vapor escape into the air.

b) Energy is lost in the form of heat.

d) The mass of the reactants is consumed.

When 5 grams of baking soda react with 15 grams of vinegar in an open container, only 18 grams of the final mixture remain. What probably happened to the missing 2 grams?

c) Part of the mass escaped as gas.

a) The reaction did not follow the law of conservation of mass.

b) Atoms were destroyed during the reaction.

Which of the following statements is true for an open system during a chemical reaction?

c) Gases can escape, causing the mass to decrease.

a) Neither matter can escape nor enter.

b) The mass of the system always remains the same.

d) Energy is destroyed, causing the total mass to decrease.

When cooking food, the total mass of the ingredients before and after cooking may seem to change. What is the most likely explanation?

c) Gases like steam can escape, making the mass appear less.

a) The food absorbs mass from the air.

b) Mass is created during cooking.

d) The food loses atoms during the process.

Which statement best describes the law of conservation of mass in a chemical reaction?

b) The total mass of the products is always equal to the total mass of the reactants.

a) Mass is created during a chemical reaction.

c) The number of molecules is the same before and after a reaction.

d) The mass of the reactants must always be greater than the mass of the products.

When you burn a piece of wood, much less mass remains as ash. Does this violate the law of conservation of mass?

c) No, because part of the mass is released as gases like carbon dioxide and water vapor.

a) Yes, because some mass is lost as energy.

b) Yes, because the mass of the wood becomes less than before.

d) No, because the mass of the wood was destroyed in the fire.

In a chemical equation, what does the law of conservation of mass require?

c) The number of atoms for each element must be the same on both sides.

a) The same number of molecules on both sides of the equation.

b) The total mass of the products must be greater than that of the reactants.

d) The equation must include energy values for all reactions.

PS8.1.3/PS8.1.5 Review

Authored by Destenee ApexFriendshipMS

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8th Grade

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30 questions

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MULTIPLE CHOICE QUESTION

2 mins • 1 pt

In the chemical formula H₂O, what does the subscript "2" indicate?

a) There are 2 oxygen atoms.

b) There are 2 hydrogen atoms.

c) There are 2 water molecules.

d) There are 2 water atoms.

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which of the following is the correct way to balance the equation below?
H₂ + O₂ → H₂O

a) H₂ + O₂ → H₂O

b) 2H₂ + O₂ → 2H₂O

c) 2H₂ + 2O₂ → H₂O

d) H₂ + 2O₂ → 2H₂O

Tags

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

How many oxygen (O) atoms are there in the compound CaCO₃?

a) 1

b) 2

c) 3

d) 4

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the total number of atoms in the molecule C₂H₆?

a) 2

b) 6

c) 8

d) 12

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which of the following equations is balanced?

a) C + O₂ → CO

b) 2Na + Cl₂ → 2NaCl

c) CH₄ + O₂ → CO₂ + 2H₂O

d) H₂ + O₂ → H₂O

Tags

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

In a chemical reaction, what does a coefficient in front of a molecule indicate?

a) How many atoms are in the molecule

b) How many molecules are present

c) The number of subscripts

d) The number of bonds in the molecule

Tags

NGSS.HS-PS1-7

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The law of conservation of mass states that:

a) Mass can be created and destroyed in chemical reactions.

b) The total mass before and after a chemical reaction remains the same.

c) Atoms are destroyed during a chemical reaction.

d) Mass is transferred between reactants and products.

Tags

NGSS.MS-PS1-5

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PS8.1.3/PS8.1.5 Review

In the chemical formula H₂O, what does the subscript "2" indicate?

Which of the following is the correct way to balance the equation below? H₂ + O₂ → H₂O

How many oxygen (O) atoms are there in the compound CaCO₃?

What is the total number of atoms in the molecule C₂H₆?

Which of the following equations is balanced?

In a chemical reaction, what does a coefficient in front of a molecule indicate?

The law of conservation of mass states that:

If you start a reaction with 12 grams of reactants, how much product should you expect according to the law of conservation of mass?

In a closed system, which of the following statements is true during a chemical reaction?

Which scenario describes an open system?

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Which of the following is the correct way to balance the equation below?
H₂ + O₂ → H₂O