UCL CENTRE FOR LANGUAGES
& INTERNATIONAL EDUCATION (CLIE)

UPC Placement Tests

Test: Chemistry 1



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1.

Potassium hydroxide solution is mixed with an excess of hydrochloric acid solution. After reaction is completed, 0.010 moles of acid has been found in 200 cm3 volume. What is the concentration of H+ ions at the end of neutralisation? 

0.05 mol dm-3

0.05 mol cm-3

5 × 10-5 mol dm-3

2 × 10-3 mol dm-3

2 mol dm-3

2.

What is the general formula of the alkene homologous series?

CnH2n

  CnH2(n+2) 

CnH2n+2

CnH2n-2

C2H2n+4 

3.

Which of the following statements is true about alkenes?

alkenes can undergo an incomplete combustion reaction to give water, carbon monoxide and carbon

alkenes can undergo a complete combustion reaction to give water and carbon monoxide

alkenes can undergo an incomplete combustion reaction to give water and carbon dioxide

alkenes can undergo a complete combustion reaction to give water, carbon dioxide and soot

alkenes can undergo a complete combustion reaction to give water, carbon monoxide and oxygen

4.

What is the bonding between the water molecules and the metal ion in [Cu(H2O)6]2+?

dative covalent

ionic

metallic

hydrogen

intermediate

5.

What is the name and molecular formula of the organic molecule shown below?

benzene, C6H12

benzene, C6H6

phenol, C6H

toluene, C6H6

toluene, C6H12 

6.

What are the correct names of the four pieces of glassware shown below?



I beaker, II volumetric flask, III measuring cylinder, IV burette

I conical flask, II beaker, III measuring cylinder, IV burette

I beaker, II volumetric flask, III measuring cylinder, IV pipette

I beaker, II conical flask, III measuring cylinder, IV burette

I beaker, II conical flask, III measuring cylinder, IV pipette

7.

What mass of sodium chloride is needed to make 500 cm3 of a solution of concentration 0.25 mol dm-3?

3.65  g

58.5 g

29.2 g

0.0342 g

7.31 g

8.

When a solution of sodium hydroxide is electrolysed using platinum electrodes which of the following takes place?

Hydrogen gas is formed at the cathode and oxygen at the anode

Hydrogen gas is formed at the anode (+) and oxygen at the cathode (-)

Sodium is produced at the cathode and oxygen is liberated at the anode

Sodium is produced at the anode and hydrogen is produced at the cathode

Sodium is produced at the cathode and hydrogen is produced at the anode

9.

A volatile compound containing C, H, and O was found to contain 41.4% carbon and 3.45% H by mass. What was the empirical formula of the compound?

C2H2O2

C2H4O4

CHO

C2H4O2

CH2O

10.

If 1.6 g of zinc were mixed with 1.6 g of sulfur and the two elements reacted as fully as possible to form zinc sulfide (ZnS) how much sulfur would be left over?

none

813 mg

320 mg

330 mg

600 mg

11.

What is the correct formula of ammonium nitrate?

NH3NO3

NH4NO2

NH4(NO3)2

(NH4)2NO3

NH4NO3

12.

Which method is used in oil refining to separate the components of crude oil?

fractional distillation

filtration

chromatography

extraction

cracking

13.

What volume of hydrogen would be obtained at room temperature and pressure from the reaction of 0.24 g of magnesium with excess hydrochloric acid? (The molar volume at RTP is 22.7 dm3)

11.35 cm3

2270 cm3

227 cm3

1135 cm3

113.5 cm3

14.

A substance melts at 770 °C. It is odorless and has a white or colorless vitreous crystal appearance. The solid dissolves readily in water. What type of structure is it most likely to have when solid?

ionic lattice

giant covalent lattice

simple molecular

metallic lattice

none of these

15.

Which solution will produce a white precipitate when mixed with sodium sulfate solution?

sodium chloride

potassium chloride

ammonium chloride

barium chloride

copper(II) chloride

16.

How many structural isomers does pentane have?

None

1

2

3

4

17.

Which atom is not an isotope of iodine?

76 neutrons and mass number of 129

72 neutrons and mass number of 125

74 neutrons and mass number of 127

75 neutrons and mass number of 128

77 neutrons and mass number of 129

18.

Silicon can be made by heating silicon tetrachloride, SiCl4, with zinc.


SiCl4(l) + 2 Zn(s) → Si(s) + 2 ZnCl2(s) 


8.50 g of SiCl4 is reacted with an excess of zinc. The percentage yield of silicon is 90%. What is the mass of silicon made? 

1.26 g

1.31 g

1.40 g

1.55 g

1.38 g

19.

When hexane is mixed with water, what do you expect to see?

formation of precipitate

formation of a purple layer above a colourless layer

homogeneous, colourless solution

homogeneous, pale yellow solution

formation of two colourless layers

20.

Which organic acid is a major component of vinegar?

ethanoic acid

methanoic acid

propanoic acid

carbonic acid

phosphoric acid

21.

Which sodium compound contains the highest percentage by mass of sodium?

sodium nitrate

sodium chloride

sodium hydroxide

sodium bromide

sodium sulfate

22.

Ammonia gas can be prepared by the following reaction:


CaO(s) +  2 NH4Cl(s)  →   2 NH3(g)   +  H2O(g)  + CaCl2(s)


If 112 g of CaO and 224 g of NH4Cl are mixed the theoretical yield of NH3 is 68.0 g.

If only 16.3 g of NH3 is actually obtained, what is its percent yield?

24.0 %

16.3 %

4.17 %

0.236 %

68.0 %

23.

What effect would using powdered calcium carbonate, instead of lumps, have on the rate of reaction between the carbonate and hydrochloric acid?

rate would increase, but not significantly

rate would increase significantly

rate would decrease

no effect

no reaction is observed between calcium carbonate and hydrochloric acid

24.

Which does not increase rate by affecting the number or nature of collisions?

adding a homogeneous catalyst

increasing the pressure

increasing the surface area

increasing the temperature

none of these

25.

The displacement reaction between chlorine and potassium bromide can be represented by the ionic redox equation:


Cl2(aq)  +  2Br-(aq)  →  2 Cl-(aq)  +  Br2(aq)


Which statement is correct?

chlorine is oxidized

chlorine is the reducing agent

bromine is the oxidising agent

bromide is oxidised

bromine is reduced

26.

Which of the solutions would be considered as a strongly alkali solution?

sodium hydroxide

distilled water

ammonia

ammonium chloride

aluminium hydroxide

27.

Which of the following best describes the structure of solid iodine?

ionic lattice

metallic lattice

giant covalent lattice

layer lattice

simple molecular

28.

In a titration reaction 24.0 cm3 of 0.10 M solution of sulfuric acid, H2SO4 was found to neutralize 25.0 cm3 of a solution of sodium

hydroxide, NaOH.  What was the concentration of the sodium hydroxide solution in mol dm-3?

0.192

0.048

0.096

0.104

0.208

29.

What type of reaction is the following chemical change?


N2O(g)     →      NO(g)    +     ½ N2(g)

dehydration

hydrolysis

redox

neutralization

formation

30.

How many valence electrons do atoms of elements in Group V have?

5

4

3

2

1