Structure and uses of materials

Question 1

Can you give the definition of an element, a compound and a mixture?

Answer 1

Element: A substance that contains only one type of atom

Compound: a substance with Two or more elements chemically joined together

Mixture: A substance with two or more elements mixed together easily separated

Question 2

Write the formula of a compound and be able to write chemical equations

Answer 2

MgCO3 = 1 atom, 1 carbon, 3 atoms of oxygen

Question 3

Name products from simple, chemical reactions

Answer 3

Magnesium + Oxygen = magnesium-oxide

Question 4

Explain what some of the uses of metal are

Answer 4

Shiny, good conductor of heat and good conductor of electricity

Question 5

Explain the difference between carbon in the form of diamond and in the form of graphite and graphene

Answer 5

Diamond: Each carbon atom is joined to 4 other carbon atoms. The bonds between the atoms are strong and difficult to break. This makes diamonds very hard and has very high melting point, and that it is insoluble in water.

Graphite: Each carbon atom forms three bonds with other carbon atoms and they form layers that are able to slide over each other. This makes graphite a soft material that feels

Graphene: This is a single layer of carbon atoms. Strong good conductor of electricity