Evidences of Chemical Reactions

Front

What is the best evidence for the formation of a new substance in a chemical reaction?

Back

The formation of bubbles.

Front

What indicates that a chemical reaction has occurred when two substances are combined?

Back

The production of a gas.

Front

What is a key indicator of a chemical change?

Back

A change in temperature with no outside heat source applied.

Front

What did Bethany observe when she mixed baking soda with pickle juice?

Back

Fizzing and bubbling, indicating a gas was produced.

Front

What does it mean if bubbles are produced and the temperature drops when two substances are combined?

Back

A chemical reaction took place.

Front

What is a chemical reaction?

Back

A process where substances combine to form new substances with different properties.

Front

What is an example of a physical change?

Back

Changing the shape of an object without altering its chemical composition.

Front

What is an example of a chemical change?

Back

Rust forming on iron.

Front

What happens to the temperature during an exothermic reaction?

Back

The temperature increases as heat is released.

Front

What happens to the temperature during an endothermic reaction?

Back

The temperature decreases as heat is absorbed.