Choose the correct word from the list to complete each sentence. You may use each word once. Write the name of the product for this reaction? Is this decomposition reaction or synthesis reaction? Give a reaction for your answer to question 5.2? Which substance is a metal?

Here are the answers to your questions:

QUESTION 4

*4.1 For substances to contract you need to cool the substance.

*4.2 For substances to expand you need to heat the substances.

*4.3 When the material expands the movement of particles increase and particles move further from each other.

*4.4 When a material is cooled, the movement of particles decrease and the particles move closer to each other.

*4.5 During expansion and contraction the number and size of particles remain the same, but the spaces between particles change.

QUESTION 5

5.1 Write the name of the product for this reaction?
The product is magnesium oxide.

5.2 Is this decomposition reaction or synthesis reaction?
This is a synthesis reaction.

5.3 Give a reason for your answer to question 5.2?
A synthesis reaction occurs when two or more simpler substances (magnesium and oxygen) combine to form a more complex substance (magnesium oxide).

5.4 Which substance is a metal?
Magnesium is a metal.