What does the Law of Conservation of Mass state?

Mass cannot be created or destroyed, only transformed.

Mass can be created or destroyed during a reaction.

Mass increases during chemical reactions.

Mass remains constant only in physical changes.

How does an increase in temperature generally affect the rate of a chemical reaction?

It increases the rate of the reaction.

It decreases the rate of the reaction.

It stops the reaction completely.

It has no effect on the reaction rate.

Which scenario best illustrates the principle of conservation of mass?

A chemical reaction where the total mass of reactants equals the total mass of products.

Which observation suggests that a chemical change has taken place?

A precipitate forms in a liquid solution.

What happens to the molecules in a substance when it undergoes a physical change?

The arrangement of molecules changes, but their chemical identity remains the same.

The chemical composition of the molecules changes.

The molecules lose energy and stop moving.

The molecules are created or destroyed.

SC.8.P.9.2 • Students will differentiate between physical and chemical changes. • Students know the characteristics of physical (change in state of matter) and chemical changes. (i.e.: new odor, change in color, new substance, change in temperature) • Students will identify a change as physical, or chemical given evidence. • Students will explain that mass is conserved when substances undergo physical and chemical changes, according to the law of conservation of mass. • Students will summarize the Law of Conservation of mass, explaining that mass cannot be created or destroyed, only transferred. • Students will describe how temperature influences chemical changes. • Students will know thermal energy increases the movement of atoms/molecules. • Students will explain that scientific explanations are based on empirical evidence, logical reasoning, predictions, and modeling.

SC.8.P.9.2 • Students will differentiate between physical and chemical changes. • Students know the characteristics of physical (change in state of matter) and chemical changes. (i.e.: new odor, change in color, new substance, change in temperature) • Students will identify a change as physical, or chemical given evidence. • Students will explain that mass is conserved when substances undergo physical and chemical changes, according to the law of conservation of mass. • Students will summarize the Law of Conservation of mass, explaining that mass cannot be created or destroyed, only transferred. • Students will describe how temperature influences chemical changes. • Students will know thermal energy increases the movement of atoms/molecules. • Students will explain that scientific explanations are based on empirical evidence, logical reasoning, predictions, and modeling. | Quizalize

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