year 7 chemical reaction

A substance formed by a chemical reaction

• product

• enzyme

• substrate

• activation energy

In which of the following are bonds broken and new bonds form ?

• chemical reactions

• isotopes

• elements

• polar molecules

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

Which is NOT an indication of a chemical change?

• temperature change
• formation of a precipitate
• shape change
• production of light

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.

Dissolving salt is a

• Chemical change

• Physical change

The glow stick reaction is a

• Chemical change

• Physical change

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

• Chemical change

• Physical change

Bubbles being produced is an example of?

• none

• Physical Property

• Chemical Sign

The color of a substance is an example of?

• Chemical Property

• Physical Property

• Chemical Sign