6.3-7th grade

1.

1 point

In a ________________ compounds are broken down or new compounds are formed.

2.

1 point

Sometimes both ___________ occur.

3.

1 point

Some chemical reactions occur when ________ or molecules come together.

4.

1 point

When a ________ burns, a chemical reaction occurs.

5.

1 point

Bonds between the atoms in some of the __________ that make up the wood are broken.

6.

1 point

As these new compounds are formed, heat and ________ are given off.

7.

1 point

Energy is stored in the bonds between the atoms in a __________.

8.

1 point

The stored energy in the chemical bonds is a form of _________ energy called chemical energy.

9.

1 point

The ___________ energy stored in food provides a source of energy for your body.

10.

1 point

In every chemical reaction, ___________ in energy occur.

11.

1 point

To break _________, energy must be added.

12.

1 point

When bonds form, _________ is released.

13.

1 point

Often energy must be _________ before the reaction can begin.

14.

1 point

Some chemical reactions need a constant supply of __________ to keep them going.

15.

1 point

Some chemical reactions need a constant supply of __________ to keep them going.

16.

1 point

a chemical reaction that absorbs energy is called an ________.

17.

1 point

________ energy is absorbed by the food as it cooks.

18.

1 point

Chemical reactions occur when ___________ strikes the leaves of green plants.

19.

1 point

This process is called _____________.

20.

1 point

When the plant is deprived of __________, the reactions stop.

21.

1 point

Photosynthesis is probably the most important ____________ process on Earth.

22.

1 point

Other reactions are important because of the compounds the ___________ produce.

23.

1 point

____________ are chemical reactions that release energy.

24.

1 point

An exothermic reaction occurs, and ________in the form of heat and light is released.

25.

1 point

Chemical reactions can occur at different ________.

26.

1 point

They occur very fast when ___________ explode.

27.

1 point

Two ways to change the rate of a chemical reaction are changing the temperature and adding a type of compound called a ___________.