slop 4

Question 1

how many atoms of each element are present in MgCl2 (small 2)

Answer 1

1 atom of magnesium 2 atoms of chlorine

Question 2

how many atoms of each element are present in CO2

Answer 2

1 atom of carbon 2 atoms of oxygen

Question 3

how many atoms of each element are present in FeO?

Answer 3

1 atom of iron 1 atom of oxygen

Question 4

what is the relative formula mass of CaCO3 [40 Ca, 12 C, 16 O]

Answer 4

40 + 12 + (3 x 16) = 100

Question 5

What may be the cause if the mass of products is less than the mass of reactants?

Answer 5

One of the products was a gas which escaped during the chemical reaction

Question 6

what is he formula linking to concentration, mass and volume?

Answer 6

Concentration = mass / volume

Question 7

How do we convert cm cubed to dm cubed?

Answer 7

divide by 1000

Question 8

how to we convert dm cubed to cm cubed

Answer 8

multiply by 1000

Question 9

state the reactivity series of metals in order, starting with the most reactive

Answer 9

Potassium , sodium , lithium , calcium , magnesium , carbon , zinc , iron , (hydrogen NOT METAL) , copper

Question 10

do metals form positive or negative ions

Answer 10

positive

Question 11

what forms when metals react with water

Answer 11

metal hydroxide and hydrogen

Question 12

sodium + water —> _______ + ________

Answer 12

sodium + water —-> sodium hydroxide + hydrogen

Question 13

what forms when metals react with dilute acid

Answer 13

a salt and hydrogen

Question 14

magnesium + hydrochloric acid —–> ______ + _______

Answer 14

magnesium + hydrochloric acid —–> magnesium chloride + hydrogen

Question 15

metal + oxygen —>

Answer 15

metal oxide

Question 16

define ‘oxidation’ and ‘reduction’ in terms of oxygen

Answer 16

reduction is loss of oxygen, oxidation is gain

Question 17

a ________ reactive metal can displace a ______ reactive metal from its compound

Answer 17

a MORE reactive metal can displace a LESS reactive metal from its compound

Question 18

Define ‘an ore’

Answer 18

a rock that contains enough of a metal or a metal compound to make extracting the metal worthwhile

Question 19

Which element is used to extract metals from their compounds

Answer 19

Carbon

Question 20

What. is the main advantage of extracting a metal by heating with carbon, rather than using electrolysis

Answer 20

much cheaper and uses less energy

Question 21

why must electrolysis be used to extract aluminium from its compounds

Answer 21

aluminium is more reactive than carbon

Question 22

what is an alkali? give an example

Answer 22

a soluble substance that neutralises an acid - e.g hydroxides

Question 23

what is a base? give an example

Answer 23

an insoluble substance that neutralises an acid - e.g oxides and carbonates

Question 24

what ion do acids produce

Answer 24

H+

Question 25

what ion do alkalis produce

Answer 25

OH-

Question 26

acid + metal —->

Answer 26

salt + hydrogen

Question 27

acid + base —->

Answer 27

salt + water

Question 28

acid + metal carbonate —>

Answer 28

salt + water + carbon dioxide

Question 29

state the chemical formula for water

Answer 29

h20

Question 30

Magnesium + hyrdrochloric acid —->

Answer 30

Magnesium chloride + hydrogen

Question 31

zinc + sulfuric acid

Answer 31

zinc sulphate + hydrogen

Question 32

state the pH range for an acid

Answer 32

0 <7

Question 33

state the pH range of a neutral

Answer 33

7

Question 34

state the pH range of an alkali

Answer 34

7 > 14