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Marco accidentally broke a crayon while coloring. Which of the following best compares the broken crayon to the original crayon? (SC.8.P.9.1)

• The density of the crayon has decreased since the crayon is smaller.

• The crayon went through a chemical reaction since there are more pieces of the crayon.

• The crayon went through a chemical change because the shape of the crayon changed.

• The total mass of the broken crayon pieces are the same as the original crayon since matter was not lost.

What does the Law of Conservation of Mass state? (SC.8.P.9.1)

• The amount of mass is changed in every experiment.

• The amount of mass is increased in every experiment.

• The amount of mass is decreased in every experiment.

• The amount of mass stays the same in every experiment.

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Brandon dissolved 10 grams of salt in 100 mL of water to form salt water. He then boiled the solution and the water boiled away. How much salt would be left in the beaker? (SC.8.P.9.1)

• gram

• grams

• grams

• grams

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In fall, dead leaves fall off trees. Every day, animals eliminate waste. All animals eventually die. As a result, what happens to the mass of the Earth? (SC.8.P.9.1)

• The mass of the Earth steadily decreases.

• The mass of the Earth steadily increases.

• The mass of the Earth stays about the same.

• The Earth does not have a mass because it is too big.

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What happens to the mass of a whole piece of paper when cut into pieces and placed in a pile? (SC.8.P.9.1)

• The mass of the whole piece of paper will be less than the mass of the pile of paper.

• The mass of the whole piece of paper and pile of paper will be the same.

• The mass of the whole piece of paper will be more than the mass of the pile of paper.

• The whole piece of paper doesn’t have a mass because it is too light.

How does the picture relate to the particles in a solid?

• The cars are driving fast and switching lanes like the particles in a solid.

• The cars are sliding past each other while driving the speed limit like the particles in a solid.

• The cars are moving so fast you cannot even see them like the particles in a solid.

• The cars are barely moving like the particles in a solid.

In the 1700s, a French chemist named Antoine Lavoisier discovered that the total mass of the products in a chemical reaction always equaled the total mass of the reactants, even when he supplied energy as heat to the reaction. Which law did Lavoisier’s work help to establish?

• The Law of Universal Gravitation

• The Law of Conservation of Mass

• The Law of Conservation of Energy

• The Law of Electric Charges

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In her chemistry class, Carmen performed an experiment that involved a chemical reaction. She measured the mass of the reactants she planned to use in her experiment using a triple-beam balance, as shown in the illustration below. According to the Law of Conservation of Mass, what will be the mass of the products in her experiment?

• 200 g

• 250 g

• 254 g

• 452 g

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When a physical or chemical change occurs, the Law of Conservation of Mass always applies. What happens to the atoms during a chemical change according to this law?

• atoms are destroyed

• atoms are rearranged

• atoms are created

• atoms are changed into charged particles

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Each summer, Marcie’s family plans an outdoor barbecue for her and her classmates. At the last barbeque, Marcie’s father used a charcoal grill instead of a gas grill. Marcie explained to her classmates that the carbon in the charcoal burns by reacting with oxygen in the air, and that this reaction releases energy as heat. Marcie then wrote the formulas for the two reactants on a paper napkin, as shown below. She told her classmates that she could use the Law of Conservation of Mass to make a prediction about this reaction. Which of the following predictions did Marcie correctly make?

• In this chemical equation, the product will contain three elements.

• In this chemical equation, the product will contain two atoms.

• In this chemical equation, the product will contain as much energy as the reactants.

• In this chemical equation, the product will contain three atoms.

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