Topic 1- Atoms Elements And Compounds:

Question 1

What are atoms?

Answer 1

Atoms are the smallest part of an element that can exist

Question 2

What do chemical symbols represent

Answer 2

Chemical symbols represent an atom of an element

E.g Na represents an atom of sodium

Question 3

How are compounds formed?

Answer 3

Compounds are formed from elements by chemical reactions

Question 4

What do chemical reactions always involve the formation of?

Answer 4

Chemical reactions always involve the formation of one or more new substances, and often include an energy change.

Question 5

What is a compound?

Answer 5

Compounds contain two or more elements chemically combined.

Question 6

How can compounds be represented?

Answer 6

Compounds can be represented by formulae using the symbols of the atoms of which they were formed.

E.g HCL is a compound containing 1 atom of hydrogen and 1 atom of chlorine per molecule

Question 7

How can compounds be separated?

Answer 7

Compounds are separated by chemical reactions and can only be separated into elements.