Y8 Elements, Atoms Compounds

Question 1

What is this?

O)—-(O
- -
- -
(C)

Answer 1

Carbon dioxide.

Question 2

What makes a compound?

Answer 2

2 different particles that are chemically bonded together by a heat source.

Question 3

Why do elements have to be heated to create a compound?

Answer 3

If they were not heated, the particles wouldn’t join to together and it would make a mixture.

Question 4

When you make a compound, will it be like the two elements that made it?

Answer 4

No.

For eg. Iron is grey and sulphur is yellow. When they are chemically bonded together, they then burn orange and leave behind a black solid which is called Iron sulphide.

Question 5

What makes Sulphur Oxide?

Answer 5

2 oxygen atoms and 1 Sulphur atom.

Question 6

What is hydroxide made out of?

Answer 6

1 hydrogen atom and 1 oxygen atom?

Question 7

How could you tell a a diagram shows a mixture?

Answer 7

You can look at each one and see if it is equal in each other compound.

For eg.
If one had a carbon atom and two oxygen atoms, and another had an oxygen atom and two oxygen atoms, it would not be a mixture as it is not equal.

Question 8

What makes water?

Answer 8

2 hydrogen atoms and 1 oxygen atom.

Question 9

What else can be found in water apart from hydrogen and oxygen?

Answer 9

Sodium and Chlorine.

Sodium and Chlorine make salt. This is why the sea water is salty.

Question 10

What is water’s chemical formulae?

Answer 10

H2O