Conservation of Mass - SC.8.P.9.1

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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NGSS.MS-PS1-5

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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NGSS.MS-PS1-5

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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NGSS.MS-PS1-5

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.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Chemical equations should be balanced so that they demonstrate the Law of Conservation of Mass. Which of the following statements about balanced chemical equations is correct?

• The products must contain the same number but not the same types of atoms as the reactants.
• The products must contain the same number and types of atoms as the reactants.
• The products must contain the same arrangement of atoms as found in the reactants.
• The products must contain the same types but not the same numbers of atoms as the reactants.

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NGSS.MS-PS1-5

When sugar is added to water to make a sugar solution, a physical change occurs. According to the Law of Conservation of Mass, what prediction can be made about this physical change?

• The sugar solution will have more mass than the sugar and water.
• The sugar solution will have the same mass as the sugar and water.
• The sugar solution will have the same volume as the water in the beaker.
• The sugar solution will have less mass than the sugar and water.

Tags

NGSS.MS-PS1-5

When copper metal is heated, a chemical reaction occurs which results in the copper metal gaining a small amount of additional mass. Given that the Law of Conservation of Mass states that matter can neither be created nor destroyed, what is the best explanation for the increase in mass of heated copper metal?

• Oxygen atoms in the air combine with the copper atoms as it is heated.
• Mass is created as the copper metal was heated.
• The heated copper metal changes into a different type of metal.
• Copper atoms are destroyed during the heating process.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

The Law of Conservation of Mass can be used to predict the mass of the products in a chemical reaction. Which of the following would be most helpful in making this prediction?

• the names of the products
• the type of chemical reaction
• the number of reactants involved
• the mass of the reactants

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NGSS.MS-PS1-5

The Law of Conservation of Mass states that mass can neither be created nor destroyed. In which of the following situations does this law apply?

• only in physical changes
• in neither chemical nor physical changes
• only in chemical changes
• in both chemical and physical changes

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NGSS.MS-PS1-5

Francine performed an experiment in which one reactant underwent a chemical reaction to form two products. According to the Law of Conservation of Mass, which statement is correct about the chemical reaction?

• The two products contain more atoms than the one reactant.
• The two products have the same number of atoms as the one reactant.
• The one reactant created atoms to form the two products.
• The one reactant has different atoms than the two products.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2