elements, compounds and mixtures

Question 1

what is an element?

Answer 1

all atoms are the same

Question 2

every element has a _____ and every _____ starts with a _____

Answer 2

symbol, symbol, capital letter

Question 3

what is a compound?

Answer 3

contain two or more different elements chemically combined in fixed proportions

Question 4

what are the properties of a compound?

Answer 4

completely different to elements they are made from

Question 5

what does magnesium sulfide form?

Answer 5

white crystals

Question 6

what is a mixture?

Answer 6

different elements or compounds but they are not chemically combined

Question 7

how do we separate mixtures?

Answer 7

physical separation techniques such as filtration distillation, crystallisation.

Question 8

what is a molecule?

Answer 8

any elements combined even if they are the same

Question 9

examples of molecules

Answer 9

water, ammonia and methane