Chemical Reactions

Front

One of the signs of a chemical reaction taking place is:

Back

Bubbles are produced 

Front

What describes a precipitate?

Back

A solid that forms in a liquid chemical reaction.

Front

Which is NOT an indication of a chemical change?

Back

shape change

Front

How can you tell if a chemical reaction has occurred?

Back

All of these answers are evidence: there is a precipitate, a color change, or a temperature change.

Front

Which of the following is an example that includes evidence of a chemical reaction? Options: A sample of zinc is placed in water and it settles to the bottom, A solid block of ice is heated and it completely melts into a liquid. , Sugar that is burned gives off an odor and turns brown and then black., A tomato is placed into a blender and chopped up into smaller pieces.

Back

Sugar that is burned gives off an odor and turns brown and then black.

Front

The production of carbon dioxide gas when baking soda and vinegar reacted indicated a _____________.

Back

Chemical change

Front

In a chemical reaction, no new atoms are created, and no atoms are _________________.

Back

Destroyed

Front

A reaction that gives off heat

Back

Exothermic

Front

When you combine vinegar and baking soda, a gas is produced. The gas produced is considered evidence that a chemical reaction occurred.

Back

True

Front

The Law of Conservation of Mass states

Back

that matter cannot be created or destroyed.