Elements, Compounds And Mixtures

Question 1

What is an element?

Answer 1

An element is a substance that cannot be spilt up into simpler substances by chemical means

Question 2

What is a compound?

Answer 2

A compound is a substance that is made up of two or more different elements combined together chemically

Question 3

Give an example of a compound and the two elements combined in it

Answer 3

Water (H2O

Hydrogen and oxygen

Question 4

What is a mixture?

Answer 4

A mixture consists of two or more different substances mingled with each other but not chemically combined

Question 5

How do you make a mixture using iron and sulfur and then change the mixture into the compound iron sulfide?

Answer 5

1. Mix 7g of iron filings and 4g of sulfur in a pestle and mortar
2. Put a magnet to the mixture, the filings should attract
3. Put the mixture into a test tube on a retort stand
4. Heat the mixture until it begins to glow. This indicates a chemical reaction taking place
5. Continue hearing until the mixture no longer glows
6. Once the contents cool, remove them from the test tube and pick out several pieces with forceps
7. Hold a magnet to the iron sulfide, it should not be attracted