Past Paper Wrong Answers

Question 1

What forms a basic oxide with the formula X2O

Answer 1

Lithium

Question 2

What is a main componemnt of fertilizers used to improve crop growth

Answer 2

Nitrogen

Question 3

What is a gas that has a high rate of diffusion at room temperature

Answer 3

Neon

Question 4

What is the ion responsible for alkalinity in a solution

Answer 4

Hydroxide

Question 5

What is an experimental technique used when salts are made by reacting dilute acid with an aqueous alkali

Answer 5

Titration

Question 6

What is a way to describe an alkali

Answer 6

A base that can dissolve in water

Question 7

What is the raw material from which nitrogen is obtained

Answer 7

Air

Question 8

What is a saturated solution

Answer 8

A solution that can contain no more solute at a given temperature

Question 9

What forms when a metal and oxygen react

Answer 9

Metal oxide

Question 10

What is the volume of one mol of gas at room temp and pressure

Answer 10

24 dm3
DECIMETRES

Question 11

What are the lines of graduated/measuring cylinders called

Answer 11

Graduation lines

Question 12

What is the difference between miscible and immiscible

Answer 12

Miscible liquids mix together completely to form a homogenous mixture, immiscible forms a heterogeneous mixture

Question 13

What is the formula for matter

Answer 13

Matter=Mass/volume (density formula)

Question 14

What is the difference between a molecule and a compound

Answer 14

2 atoms bonded together=molecule
2 different atoms bonded=compound

Question 15

2NO + O^2 -> 2NO^2
How does this equation show that NO is oxidised?

Answer 15

Oxygen is added

Question 16

Cr2O3 + 2Al -> Al2O3+ 2Cr
How does this equation show that chromium(III) oxide is reduced?

Answer 16

It has lost an oxygen

Question 17

Describe how you could prepare a pure sample of crystals of hydrated cobalt(II) sulfate using dilute
sulfuric acid and an excess of cobalt(II) carbonate

Answer 17

heat cobalt carbonate with dilute sulfuric acid
filtering off the excess cobalt carbonate
Heat the filtrate to point of crystallisation
dry the crystals between filter paper

Question 18

Describe how you could prepare a pure sample of crystals of hydrated zinc sulfate using dilute
sulfuric acid and an excess of zinc

Answer 18

Heat zinc with sulfuric acid
Filter off excess zinc
Heat to point of crystallization
Dry between filter paper

Question 19

Diffusion

Answer 19

the random movement of particles from a region of their high concentration to a region of their low concentration down the concentration gradient

Question 20

non-metal cation that produces ammonia when warmed with sodium hydroxide solution

Answer 20

Ammonium

Question 21

Process used to manufacture sulfuric acid

Answer 21

Contact process

Question 22

What do alkenes do to bromine water

Answer 22

Decolourise it
DOES NOT MAKE IT CLEAR

Question 23

Markovnikov’s rule

Answer 23

The major product is where the hydrogen is added to the carbon with the most hydrogens already attached

Question 24

Solubility of alkanes

Answer 24

Insoluble in water
Soluble in non polar solvents

Question 25

Reducing agent in blast furnaces

Answer 25

Carbon monoxide

Question 26

Main impurity in iron ore

Answer 26

Silicon (IV) oxide

Question 27

Change in melting in boiling point of an impure substance compared to the pure substance

Answer 27

Melting point decreases
Boiling point increases