Year 9 Advanced Science – Chemistry Trial test

Name: ______

Part A: Multiple Choice Questions [ 30 marks ]

  1. Which one of the following processes are examples of a chemical reaction?

AIron rusts when in a damp environment.

BSquashing up a soft drink can

CA mist forms when you breathe onto cold glass.

DIce melts as you hold it in the palm of your hand.

  1. When a metal reacts with hydrochloric acid, the products are:

Aa salt and oxygen gas.

Ba salt and hydrogen gas.

Ca salt and water.

Dwater and carbon dioxide.

  1. When an acid and base react together, which substances would you always expect to be produced?

AA salt and oxygen gas

BA salt and hydrogen gas

CA salt and water

DWater, a salt and carbon dioxide

  1. A reaction in which an acid reacts completely with a base to produce water is called:

Aan acidic reaction

Ba decomposition reaction

Ca neutralisation reaction

Da precipitation reaction.

  1. Adding liquid X to water decreases its pH. This shows that the liquid X is:

Aan acid.

Ba base.

Cneutral.

Dwater.

  1. Acids generally:

Ataste sour.

Btaste bitter.

Cfeel slippery.

Dare coloured.

  1. Which one of the following statements about bases is true? Bases:

Aunlike dangerous acids, are generally quite safe.

Bare just a stronger type of acid.

Care found in citrus fruits.

Dare used in many cleaning products.

  1. Which one of the following compounds is an acid?

AKOH

BNaCl

CHNO3

DNa2CO3

  1. Which of the following lists the metals sodium (Na), gold (Au), iron (Fe) and copper (Cu), in order of increasingreactivity?

A Na, Fe, Cu, AuBAu, Cu, Fe, Na

CFe, Na, Au, CuDCu, Au, Na, Fe

  1. Non-metals like oxygen and chlorine are very reactive because they have:

Amany outer-shell electrons, and they are readily accepted

Ba few outer-shell electrons, and they are readily donated

Cmany outer-shell electrons, and they are readily donated

D a few outer-shell electrons, and they are readily donated

  1. A precipitate:

Amay form when two clear solutions are mixed

Bis a soluble salt

Cforms because the ions in a solution repel each other

Dcollects at the surface when two solutions are mixed

  1. A strong acid is an acid which:

Aeasily donates its hydrogen ion to a base

Bdoes not easily donate its hydrogen ion to a base

Chas few solute particles dissolved in the solvent

Dmeans a concentrated acid

  1. When solutions of sodium chloride (NaCl) and silver nitrate (AgNO3) are mixed, solid silver chloride (AgCl) forms. Which ions remain dissolved
    in the solution?

A Na+ and ClBAg+ and Cl

CNa+ and DAg+ and

  1. An acid reacting with a metal hydroxide to produce salt and water is an example of a:

A combustion reactionBdisplacement reaction

Cneutralisation reaction Ddecomposition reaction

  1. Making Iron sulphide by heating a mixture of Iron filings and sulphur powder

A combustion reactionBdisplacement reaction

Ccombination reaction Ddecomposition reaction

Part B – Short-answered Questions [ 70 marks]

1. Write the chemical formulas for these compounds. [ 9 marks ]

awater ______

bcarbon dioxide (dry ice)______

chydrogen gas ______

dhydrochloric acid ______

e sulphuric acid ______

enitric acid ______

fcaustic soda (sodium hydroxide) ______

gcommon salt (sodium chloride) ______

h ammonia ______

2. The table below shows the symbol or formula of several ions. [ 8 marks ]

Name of ion / Symbol or formula
calcium / Ca2+
aluminium / Al3+
sulphate / SO42-
hydroxide / OH–
phosphate / PO43–
ammonium / NH4-
sodium / Na+
bromide / Br–

Write the chemical formula for:

calcium bromide______

ammonium hydroxide______

ammonium sulphate______

sodium phosphate______

aluminium bromide______

calcium sulphate______

aluminium phosphate______

aluminium sulphate______

3. Complete the table - how many atoms of each element and the total number of atoms are there in these compounds? [ 24 marks ]

Compounds / Name / List all elements / Total number of atoms
eg. Ca Cl2 / Calcium chloride / 1 calcium, 2 chlorine / 3
MgI
Li2SO4
Fe2O3
SiO2
Ba3(PO4)2
NH4NO3
Zn(OH)2
HgCO3

Zn(NO3)2

4. Predict the missing chemicals in these equations: [ 8 marks ]

aHCl + NaOH  NaCl + ______

bHNO3 + Zn  Zn(NO3)2 + ______

cHCl + ______ CaCl2 + H2O

d CH4 + O2 ______+ H2O

e HNO3 + Na2CO3 NaNO3 + H2O + ______

f Zn + CuCO3 ZnCO3 + ______

gNa2SO4 + Pb(NO3)2 NaNO3 + ______

hH2SO4 + ______ K2SO4 + H2O

5. Use any of the terms in the list below to label each of the reactions shown in a to d.

decomposition, precipitation, displacement, combustion [ 4 marks ]

aPb(NO3)2(aq) + 2KCl(aq) PbCl2(s) + 2KNO3(aq) ______

bC6H12O6(aq) + 6O2(g) 6CO2(g) + 6H2O(1) ______

cMg(s) + ZnCl2(aq)MgCl2(aq) + Zn(s) ______

d2MgO(s)  2Mg(s) + O2(g) ______

6. In a solution of pH 7, what colour is:[ 8 marks ]

ared litmus? ______

bblue litmus? ______

Use numbers from the list below to give the approximate pH of the solutions described in c to e.
1, 5, 7, 8, 13

ca concentrated solution of a strong acid ______

da neutral solution ______

ea dilute solution of a weak base ______

f Name an indicator that would show the same colour at pH 3 and pH 5.
______

gName an indicator that would show different colours for solutions of pH 9 and pH 11.

______

hWhich two indicators would give exactly the same results at both pH 3 and pH 10?
______

7.Complete the table below: [10 marks ]
Neutron number = Mass number – Proton number

Symbol / Element / Atomic
number / Mass
number / Proton / Neutron / Electronic
configuration
Na / sodium / 11 / 23 / 11 / 12 / [2, 8, 1]
C / 6 / 6
Argon / 40 / 18
P / 15 / 16
B / 11 / [2, 3]
unknown element / 39 / 19

Draw an atomic structure of the unknown element