Signs of a Chemical Reaction

What are the following signs of a Chemical Reaction below?

Select Two

• Bubbles

• Change in Color

• change in state

• change in shape

You have 2 chemicals, CHEMICAL A and CHEMICAL B. They are both liquids. When you combine them you notice some crystals starting to form within them. Did a chemical reaction occur?

• Yes

• No

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

Which one shows that a chemical reaction has occurred?

• Melting

• Bending

• Dissolving

• Formation of a Gas

What is the BEST definition of a chemical reaction?

• A change in matter that produces one or more NEW substances

• When two things combine and EXPLODE.

What is a chemical reaction?

• A very boring change in matter

• A change in matter when matter changes its form or appearance

• A change in matter when the physical appearance changes

• A change in matter when the molecules rearrange to make new molecules

Which example is a chemical change?

• Baking powder fizzing

• Ice melting

• Water boiling

• Sugar Cube Dissolving

When vinegar and baking soda are combined, bubbles and foam are produced.

What evidence demonstrates that a chemical change has occurred?

• A color change occurs.

• A gas is formed.

• A solid is dissolved.

• A precipitate is formed.

A substance that is formed as the result of a chemical reaction is a __________________

• Product

• Reactant

• Starters

• Enders

Is a Change in Color a sign of a Chemical Reaction?

• No

• Yes