UCL CENTRE FOR LANGUAGES
& INTERNATIONAL EDUCATION (CLIE)

UPC Practice Entry 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
Incorrect - Acid-bases titrations calculations

2.	What is the general formula of the alkene homologous series?

	C_nH_2n
	C_nH_2(n+2)
	C_nH_2n+2
	C_nH_2n-2
	C₂H_2n+4
Incorrect - Homologous series

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
Incorrect - Combustion

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

	dative covalent
	ionic
	metallic
	hydrogen
	intermediate
Incorrect - Complex metal ions

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

	benzene, C₆H₁₂
	benzene, C₆H₆
	phenol, C₆H₆
	toluene, C₆H₆
	toluene, C₆H₁₂
Incorrect

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
Incorrect - Titrations

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
Incorrect - Formula mass and mole calculations

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
Incorrect - Electrolysis

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
Incorrect - Formulae and equations

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
Incorrect - Formula mass and mole calculations

11.	What is the correct formula of ammonium nitrate?

	NH₃NO₃
	NH₄NO₂
	NH₄(NO₃)₂
	(NH₄)₂NO₃
	NH₄NO₃
No, try again - Naming compounds

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

	fractional distillation
	filtration
	chromatography
	extraction
	cracking
Incorrect - Crude oil, hydrocarbons and alkanes

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
No, use Avogadro's law

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
Incorrect - Bonding, structure and the properties of matter

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
Incorrect - Making salts

16.	How many structural isomers does pentane have?

	None
	1
	2
	3
	4
Incorrect - Isomers

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
No, think about the connection between number of neutrons, mass number and atomic number

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
Incorrect - Formula mass and mole calculations

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
No, try again. Think about polar versus non-polar liquids

20.	Which organic acid is a major component of vinegar?

	ethanoic acid
	methanoic acid
	propanoic acid
	carbonic acid
	phosphoric acid
Incorrect - Carboxylic acids

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

	sodium nitrate
	sodium chloride
	sodium hydroxide
	sodium bromide
	sodium sulfate
Incorrect - Formula mass and mole calculations

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 %
Incorrect - Percentage yield calculations

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
Incorrect - Rates of reactions

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
Incorrect - Rates of reactions

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
Incorrect - Redox reactions

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

	sodium hydroxide
	distilled water
	ammonia
	ammonium chloride
	aluminium hydroxide
No, try again

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

	ionic lattice
	metallic lattice
	giant covalent lattice
	layer lattice
	simple molecular
Incorrect - Bonding, structure and the properties of matter

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
Incorrect - Acid-bases titrations calculations

29.	What type of reaction is the following chemical change? N₂O(g) → NO(g) + ½ N₂(g)

	dehydration
	hydrolysis
	redox
	neutralization
	formation
Incorrect - Redox reactions

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

	5
	4
	3
	2
	1
No, try again. The group number corresponds to the number of valence electrons.