Evidence of Chemical Reactions

Front

What is evidence of a chemical reaction?

Back

Evidence of a chemical reaction includes changes in temperature, color, formation of a precipitate, or gas production.

Front

What does the Law of Conservation of Mass state?

Back

The Law of Conservation of Mass states that mass is never created or destroyed in a chemical reaction.

Front

What is a precipitate?

Back

A precipitate is a solid that forms when two liquids are mixed.

Front

If a reaction starts with 20g of reactants, how much mass should the products have?

Back

The products should have a total mass of 20g.

Front

What is a common observation that indicates a chemical reaction has occurred?

Back

An increase in temperature is a common observation indicating a chemical reaction.

Front

What happens to the mass of reactants in a closed system during a chemical reaction?

Back

The mass of reactants remains the same as the mass of products in a closed system.

Front

What is an example of a gas produced in a chemical reaction?

Back

An example of a gas produced is carbon dioxide when vinegar reacts with baking soda.

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is an indicator of a chemical reaction involving color change?

Back

A color change in a solution can indicate that a chemical reaction has occurred.