Multiple choice questions

Which compound contains the smallest bond angle?

A bromoethane

B ethanol

C ethane

D ethene

B - ethanol (due to the lone pairs repelling than bonded pairs in ethanol)

What is the number of unsaturated isomers (structural and stereoisomers) that have the molecular formula C4H8?
A 3

B 4

C 5

D 6

B 4

Which element has atoms with the largest number of unpaired p-electrons?

A aluminium

B oxygen

C chlorine

D phosphorus

D

Which sequence has elements in order of increasing first ionisation energy?

A Na < Mg < Al

B Mg < Al < Si

C Al < Si < P

D Si < P < S

C Al < Si < P

After delivering a solution from a pipette, a droplet remains in the tip of the pipette. How should a student ensure that the pipette delivers the volume of solution stated on the pipette?

A Fill the pipette just above the graduation line to compensate for the volume of the droplet that remains in the tip.

B Leave the droplet in the tip.

C Shake the pipette to force out the droplet left in the tip.

D Use a pipette filler to force the droplet out of th

B Leave the droplet in the tip.

A student mixes 250.0 cm3 of 0.100 mol dm–3 KOH with 750.0 cm3 of 0.100 mol dm–3 Ca(OH)2. What is the OH– concentration, in mol dm–3, in the resulting mixture?

A 0.0250

B 0.100

C 0.150

D 0.175

D 0.175

Some Group 2 compounds can be used to neutralise acid soils and to treat acid indigestion.

Which Group 2 compound would not be suitable for either use?

A BaSO4

B CaCO3

C Ca(OH)2

D Mg(OH

A. BaSO4

Potassium ferrate(VI) contains two potassium ions for every ferrate(VI) ion.

What is the formula of the ferrate(VI) ion?

A FeO3 2−

B FeO4 2−

C FeO5 2−

D FeO6 2−

B FeO4 2−

The unbalanced equation for the reaction of copper with concentrated nitric acid is shown below. .........Cu + .........HNO3 → .........Cu(NO3) 2 + .........NO2 + .........H2O

What is the number of moles of HNO3 that react with 1 mole of Cu?

A 2

B 3

C 4

D 6

C 4

2.0 dm3 of Cl 2 gas reacts with 2.0 dm3 of Cl F3 gas to form 6.0 dm3 of a gaseous compound. The reaction has 100% atom economy and all volumes are measured at the same temperature and pressure.

What is the molecular formula of the compound formed?

A Cl F

B Cl 2F3

C Cl 3F2

D Cl 3F3

A Cl

A student plans to prepare a solution of Ba(OH)2 from barium by two different reaction routes.

Outline 2 reaction routes for preparing a solution of Ba(OH)2 from barium in the laboratory.

Include relevant equations - 4m

Route 1

Reactant: Add water (to Ba) OR H2O in equation

Balanced equation: Ba + 2H2O → Ba(OH)2 + H2

Route 2

Balanced equation with O2 : 2Ba + O2 → 2BaO

Balanced equation with H2O : BaO + H2O → Ba(OH)2

8.0 dm3 of NO is mixed with 6.0 dm3 of O2 at room temperature and pressure (RTP). The reaction below takes place until one of the reactants is used up. 2NO(g) + O2(g) → 2NO2(g) What is the volume of the mixture at RTP after the reaction has taken place?

A 8.0 dm3

B 10.0 dm3

C 12.0 dm3

D 14.0 dm3

A 8.0 dm3

What is the volume of 0.0100 mol of N2 at 350 °C and 200 kPa?

A 145 cm3

B 259 cm3

C 145 dm3

D 259 d

B 259 cm3

Hydrogen and chlorine react as shown below. H2(g) + Cl 2(g) → 2HCl (g) ∆H o = −184.6 kJ mol−1 Which statement about this reaction is correct?

A Less energy is released on bond making than is taken in during bond breaking.

B The enthalpy change for the reverse equation is +184.6 kJ mol−1.

C The enthalpy change of formation of HCl (g) is –184.6 kJ mol−1.

D The temperature decreases during the reaction.

B The enthalpy change for the reverse equation is +184.6 kJ mol−1.

(according to the law of conservation of energy, if a forward reaction is exothermic, the reverse reaction must be endothermic by the exact same magnitude)

Which statement about infrared radiation is not correct?

A The energy from IR radiation causes some covalent bonds to vibrate more.

B Absorption of IR radiation by some atmospheric gases is linked by some scientists to global warming.

C IR radiation is used to monitor gases causing air pollution.

D The action of IR radiation on CFCs in the upper atmosphere leads to the formation of chlorine radicals.

D The action of IR radiation on CFCs in the upper atmosphere leads to the formation of chlorine radicals.

Calcium nitride reacts with water to form a solution containing two alkaline compounds. Write an equation for this reaction

Ca3N2 + 6H2O → 3Ca(OH)2 + 2NH3

what is the equation for the reaction of Ammonium and NaOH

NH4 + + OH– → NH3 + H2O

write the equation for the dehydration of cyclohexanol

what are standard conditions?

pressure = 100kPa

temperature = 25 degrees celcius or 298K

Explain what is meant by the term relative atomic mass of an element.

(Weighted) mean mass of an atom,

compared with 1/12th mass of carbon-12

Describe two observations which would be different if the student had used calcium in place of strontium. 2m

1.less vigorous fizzing/bubbling/effervescence

2. dissolves more slowly/slower reaction

3. solution has a lower pH/less alkaline

4. precipitate forms/less soluble

Suggest two properties of CCl2F2, explain with reason -4m

• non- flammable

• non-toxic

• propellants in aerosol : because they are volalatile/easily compressed

• blowing polymers: because it us unreactive

• dry cleaning : because it is a good solvent for organic material

• fire extinguisher: non flammable

what is the structure for a phosphoric acid catalyst

H3PO4

what is the product when an alcohol is dehydrated.

an ALKENE and water

explain what is meant by low volatility

• high boiling point

• not easily vapourised

explain what is meant by intermolecular bonds

forces of attraction between molecules

this fc is o remind you to go to quetstion 7 on cognito for alcohols

The disposal of polymers causes environmental damage.

Research chemists are developing polymers that will reduce this environmental damage and increase sustainability.

describe 2 was in which chemists can reduce his environmental damage.

developing photodegradable polymers

developing biodegradable polymers

developing use as feedstock

developing was of sorting and recycling polymers

what is meant by the term fractional distillation?

separation by (differences in) boiling point