Standard Grade Revision

Units 1 and 2.

Q.1 When green copper carbonate is added to hydrochloric acid solution a rapid reaction takes place in which a gas is given off and a blue solution is formed.

Give two pieces of information which would prove that a chemical reaction had taken place.

Answer:- 1) In the reaction a gas is formed.

2) In the reaction there is a colour change – the

green copper carbonate changes to a blue

solution..Standard Grade Chemistry

Units 1 and 2 Revision

Q2. When silvery magnesium ribbon is burned in air the

magnesium combines with oxygen in the air to form

white magnesium oxide. In the reaction heat and

light energy are given out.

(a) Give two pieces of information that shows that a chemical reaction has taken place.

(b) What word is used to describe a reaction in which energy is given out?

(c) Write a word equation for the reaction.

Answers:-

(a) 1. Colour change (Silver magnesium to white powder). 2. Energy given out.

(b) Exothermic.

(c) Magnesium + Oxygen Magnesium oxideBurning magnesium in air

Q3. Barium chloride and sodium sulphate solutions are both

colourless. When the two solutions are mixed a white solid

called barium sulphate is formed.

(a) Give one piece of information which shows that a chemical

reaction had taken place.

(b) Which of the chemicals mentioned is the precipitate?

Units 1 and 2 Revision

Answers:-

(a) Solid being formed in the reaction when the chemicals

present in the two solutions react together.

(b) The barium sulphate is the precipitate. A precipitate is

an insoluble solid formed when two solutions are mixed.

Mixing solutions of barium chloride

and sodium sulphate

Units 1 and 2 Revision.

Q4. Write the symbol for each of the following elements.

(a) Potassium (b) Phosphorus (c) Sulphur

(d) Sodium (e) Calcium (f) Copper

Answers:-

(a) K (b) P (c) S

(d) Na (e) Ca (f) Cu

Q5. What are the names of the elements whose symbols are

shown below?

(a) Zn (b) O (c) F

(d) He (e) Fe (f) Cr

Answers:-

(a) Zinc (b) Oxygen (c) Fluorine

(d) Helium (e) Iron (f) Chromium

H

Li

Na

K

Rb

Cs

Fr

Be

Mg

Ca

Sr

Ba

Ra

Sc

Y

La

Ti

Zr

Hf

V

Nb

Tl

Cr

Mo

W

Mn

Tc

Rh

Fe

Ru

Os

Co

Rh

Ir

Ni

Pd

Pt

Cu

Ag

Au

Zn

Cd

Hg

B

Al

Ga

In

Tl

C

Si

Ge

Sn

Pb

N

P

As

Sb

Bi

O

S

Se

Te

Po

F

Cl

Br

I

At

Ne

Ar

Kr

Xe

Rn

He

Ce

Th

La

Pr

Pa

Hf

Nd

U

Tl

Pm

Np

W

Sm

Pu

Rh

Eu

Am

Os

Gd

CmRhIr

Tb

Bk

Pt

Dy

Cf

Au

Ho

Es

Hg

Er

Fm

Ga

Tm

Md

Ge

Yb

No

As

Lu

Lr

Se

Use your data booklet.

Units 1 and 2 Revision.

Q6. Name the elements present in the following compounds.

(a) Lead sulphide (b) Calcium carbide

(c) Copper sulphate (d) Sodium hydrogencarbonate.

Answers:-

(a) Lead and sulphur (b) Calcium and carbon

(c) Copper, sulphur and oxygen (d) Sodium, hydrogen, carbon

and oxygen

Q7. Name the compounds which contain the following

elements.

(a) Oxygen and iron. (b) Barium, oxygen and carbon

(c) Lead, nitrogen and oxygen (d) Chlorine and copper.

Answers:-

(a) Iron oxide (b) Barium carbonate

(c) Lead nitrate (d) Copper chlorideStandard Grade Chemistry

Q8. Use the word box below to answer the following

solute solution solvent dilute concentrated saturated

(a) When sodium chloride is dissolved in water the water is described as being the …………………(b) When sodium chloride is dissolved in water the sodium

chloride is described as being the ………………….(c) When no more sodium chloride will dissolve in water the sodium chloride solution is said to be ……………………(d) A solution which contains a lot of sodium chloride

dissolved in a small volume of water is said to be …………………………

Units 1 and 2 Revision.

Answers:-

(a) solute (b) solvent (c) saturated

(d) concentratedStandard Grade Chemistry

Units 1 and 2 Revision.

Q9.

(a) Identify the two experiments which can be used to investigate the

effect of concentration on the rate of the reaction.

(b) Identify the experiment with the fastest reaction rate.

Answers

(a) C and D. (b) F

Standard Grade Chemistry

Units 1 and 2 Revision.

Q10. Matthew added manganese dioxide to hydrogen peroxide solution, oxygen was produced. Manganese dioxide is a catalyst. 

(a) What is the purpose of a catalyst?

(b) What will be the mass of the manganese dioxide at the end

of the reaction?

(c) What would happen to the rate at which oxygen gas is given off

if the temperature was raised to 35oC?

Answers: (a) A catalyst speeds up a reaction.

(b) 0.1 g (A catalyst is not used up in a reaction).

(c) The rate of oxygen gas production will increase.Standard Grade Chemistry

Units 1 and 2 Revision.

Q11. Zinc reacts with dilute sulphuric acid. 

 

Identify the two factor which will speed up the reaction.

A Using a larger volume of acidB Diluting the acid with waterC Using a larger beakerD Heating the acidE Using a catalyst

Answers:- D and E.

Standard Grade Chemistry

Units 1 and 2 Revision.

Complete the following sentences.

1. All chemical reactions involve the formation of one, or more ……………… substances.

2. Everything in the world is made from about

……………. elements.

3. When elements join together they form

…………………………..

4. A mixture is formed when two, or more,

substances come together but do …… react.

new

100

compounds

not

Standard Grade Chemistry

Units 1 and 2 Revision.

Complete the following sentences.

1. ………………. the temperature will speed

up a reaction.

2. Changing from a lump to a powder increases the ………………. ………………. of a solid

and ………….. ………… a reaction.

3. 2 mol/l acid is ……………. concentrated

than 1 mol/l acid. The more concentrated acid reacts more ………………… with

marble chips than the dilute acid.

surface area

speeds up

more

quickly

Increasing

Standard Grade Chemistry