Elements, mixtures and compounds

Question 1

What is a element?

Answer 1

pure substance that cannot be broken down into 2/more simpler substances by chemical processes

Question 2

What are atoms?

Answer 2

smallest particles of an element that have the chemical properties of that element

Question 3

What is a molecule?

Answer 3

a group of 2/more atoms that are chemically combined

Question 4

What is a compound?

Answer 4

pure substance containing 2/more elements that are chemically combined in a fixed ratio

Question 5

What is a mixture?

Answer 5

2/more substance that are not chemically combined

Question 6

Difference between compound and mixtures:

Answer 6

MIXTURES:
dont need any fixed ratio
no chemical reaction takes place when mixture formed
can be separated by physical processes
COMPOUNDS:
broken down only by chemical processes
energy change when reaction occurs
physical properties different from constituent elements