Chemical Reactions

Which of the following are signs of a chemical reaction?

• Formation of a gas

• A change in temperature

• A change in color

• A change in size

Which of these is NOT a sign of a chemical reaction?

• A phase change

• Formation of a precipitate

• A color change

• A temperature change

You have a large glass of water and you stir salt into it until all the salt completely dissolves. Is this a chemical reaction?

• Yes

• No

When you combine baking soda and vinegar the reaction produces bubbles.

Is this a chemical reaction?

• Yes

• No

You have a beaker full of water. If you add a solid substance to the beaker and the water level rises, is this a chemical reaction? Why or why not?

• Yes because it is a mixture now.

• No because there was no sign of a chemical reaction.

• Yes because the water moved.

• No because the temperature changed.

When materials are mixed together and change occurs.

• solution

• chemical

  reaction

• precipitate

• product

Something that is formed as a result of a chemical reaction.

• solution

• chemical

  reaction

• precipitate

• product

A new solid that is formed as a product of a chemical reaction.

• solution

• chemical

  reaction

• precipitate

• product