Chemical reactions

Evidence of a chemical reactions is anything that shows - 

• a new substance has formed
• a solid dissolved in a liquid
• interaction between 2 gases
• a change in the state of matter

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

• Bubbles are produced 
• Reactants are not combining
• Products are not forming
• Color is not changing

You know you a chemical reaction has occurred if 

• there is a precipitate.
• there is a color change.
• there is a temperature change.
• All of these answers are evidence.

A chemical reaction that transfers energy from the reactants to the surroundings is referred to as

• exothermic

• endothermic

• paleothetic

• exergonic

What type of reaction is energy transferred from the surroundings to the reactants

• exothermic

• polyatomic

• endothermic

• polygenic

What type of change do we see in when we melt ice?

• Physical Change
• Chemical Change

This image shows a

• chemical reaction

• physical change

• musical change

• all of these answers are correct

Which of the following describes a precipitate?

• a liquid forms when a block of metal is heated
• a solid forms when one liquid is poured into another
• a gas forms when a solid is placed in a liquid
• bubbles form when an acid is poured on a rock

The reactants are:

• molecular oxygen and 2 carbon

• 2 carbon monoxide

• all of these are products

• all of these are reactants

Metals that react quickly/strongly with water and acids are called?

• Reactive
• Unreactive
• Dangerous
• Corrosive