Unit 2 Assessment

Front

What is a chemical change?

Back

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

Front

What are some signs of a chemical change?

Back

Signs of a chemical change include a change in color, production of gas, formation of a precipitate, and a change in temperature.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

What is an open system?

Back

An open system is one where both matter and energy can enter and leave the system.

Front

What is a closed system?

Back

A closed system is one where energy can enter and leave, but matter cannot.

Front

What is an isolated system?

Back

An isolated system is one where neither matter nor energy can enter or leave.

Front

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

Back

The mass of reactants remains the same before and after the reaction.

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What is an example of a physical change?

Back

An example of a physical change is melting ice into water.

Front

What is an example of a chemical change?

Back

An example of a chemical change is rust forming on iron.