chemical changes

Question 1

what are metal oxides formed from

Answer 1

metal + oxygen

Question 2

what is oxidation

Answer 2

gain oxygen loss of hydrogen
loss of electrons

Question 3

reduction

Answer 3

loss of oxygen gain of hydrogen#
gain of electrons

Question 4

how does calicum react with dilute acid

Answer 4

very quick

Question 5

how does magnesuim react with dilute acid

Answer 5

quick

Question 6

how does zinc react with dilute acid

Answer 6

fairly slow

Question 7

what can a more reactive metal displace

Answer 7

a less reactive metal from a compound

Question 8

what happens when an ionic substance is melted or dissolved

Answer 8

the ions are free to move within the liquid

Question 9

what is electroyisis

Answer 9

passing a current through substances that are molten and can be broken down into elements

Question 10

what happens during electrolysis

Answer 10

positively charged ions moved to the negative cathode and negatively charged ions move to the positive electrode the anode

Question 11

what happens to ions

Answer 11

ions are discharges at the electrodes producing elements

Question 12

what are acids neutralised by

Answer 12

an alkali

Question 13

what are acids neautalised by

Answer 13

metal carbonates to produce salts

Question 14

what is a base

Answer 14

as base can neutralise an acid and produce a salt

Question 15

what does an acid and alkail produce

Answer 15

salt + water

Question 16

acid ion

Answer 16

h+

Question 17

alkali ion

Answer 17

OH-