classifying materials

Question 1

an element:

Answer 1

is a pure substance that cannot be broken down into simpler substances be chemical means

Question 2

compound

Answer 2

a pure substance made of two or more different elements that are chemically combined

Question 3

mixture

Answer 3

made of two or more different types of particle mingled together

Question 4

atom

Answer 4

is the smallest particle of an element that can exist

Question 5

physical change,2.e.g ?

Answer 5

is one in which no new substance is made. e.g. ice melting, crushing a can.

Question 6

chemical change, 2 e.g.?

Answer 6

chemical changes cause new substances to form. e.g. fireworks exploding, milk turning sour.

Question 7

2 example of elements

Answer 7

oxygen, gold

Question 8

2 e.g. of compounds

Answer 8

water, carbon dioxide

Question 9

2 e.g. of mixtures

Answer 9

air, salt+water

Question 10

4 properties of metal element or compounds

Answer 10

strong,
solid,
ductile,
shiny

Question 11

4 properties of non metallic elements of compounds

Answer 11

dull,
poor conductor of heat,
poor conductor of electricity ,
low boiling + melting points