introduction 3.1

Question 1

what is a physical change

Answer 1

create no new substances
easy to reverse
absorb or release small amounts of energy

Question 2

what is a chemical change

Answer 2

creates new substances
difficult to reverse
absorb or release large amounts of energy

Question 3

chemical test for water

Answer 3

anhydrous copper(II) sulphate turns from white to blue

Question 4

test for pure water

Answer 4

Mp = 0
Bp = 100

Question 5

metal properties

Answer 5

high MP/BP
electrical conductors
malleable
shiny

Question 6

non-metal properties

Answer 6

low MP/BP
electrical insulators
brittle
dull

Question 7

7 diatomic molecules

Answer 7

hydrogen
nitrogen
fluorine
oxygen
iodine
chlorine
bromine

Question 8

what is a compound

Answer 8

a substance containing more than one type of atom chemically bonded together

Question 9

how are compounds formed

Answer 9

heating elements together

Question 10

3 types of compounds

Answer 10

metallic, ionic, covalent

Question 11

solute

Answer 11

substance which is going to be dissolved

Question 12

solvent

Answer 12

liquid which is going to do the dissolving

Question 13

solution

Answer 13

resulting mixture of solute dissolved in solvent

Question 14

saturated

Answer 14

a solution in which no more solute can be dissolved in

Question 15

suspension

Answer 15

a solid floating in a liquid because it cannot dissolve

Question 16

how is solubility measured

Answer 16

g per 100g of solvent

Question 17

what does the line of a solubility curve show

Answer 17

saturation, the max mass of a solid which can be dissolved at each temp

Question 18

what does the area below the solubility curve show

Answer 18

soluble, it will dissolve

Question 19

what does the area above the solubility curve show

Answer 19

insoluble, some will dissolve and some wont