Atoms and Mass in Chemical Reactions

Question 1

What are atoms?

Answer 1

The smallest particles you can get of each element

Question 2

What is is that take part in chemical reactions?

Answer 2

Atoms

Question 3

What happens to atoms in chemical reactions?

Answer 3

Atoms aren’t lost or made in chemical reactions.

You still have the same atoms at the end of the chemical reaction as you have at the start, they’re just arranged in different ways to give new products with different properties from the reactants.

Question 4

Because atoms aren’t gained or lost, the mass of the reactants —— the mass of the products.

Answer 4

Equals

Question 5

The total mass before and after a sealed reaction is unchanged, true or false?

Answer 5

true

Question 6

What is a precipitation reaction?

Answer 6

A precipitation reaction happens when two solutions react and an insoluble solid forms in the solution.
The solid is said to ‘precipitate out’ and the solid is also called the ‘precipitate’

Question 7

What are elements and compounds made up of?

Answer 7

Atoms