OCR B A Level Chemistry Specimen Papers Questions

Questão 1 de 14

1

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A flame test should be carried out using a wire and HCl. If it was calcium that was being tested the flame would be .

Explicação

Questão 2 de 14

1

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To test for the presence of iron(III) chloride in a sample of limestone you would add a solution of nitrate to the sample and a precipitate will be formed for the chloride ions. You would also do a test for the Fe(III) by adding giving a precipirate.

Explicação

Questão 3 de 14

1

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The reagent used with sodium iodide to produce purer hydrogen iodide is .

Explicação

Questão 4 de 14

1

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The absorption of UV radiation by ozone is important for human life since UV radiation causes damage to .

Explicação

Questão 5 de 14

1

The shape of an ozone molecule is ❌ because there are ❌ groups of electrons around a central O atom. The bond angle could be ❌.

Arraste e solte para completar o texto.

bent

triangular planar

pyrimidal

3

4

120°

109.5°

107°

Explicação

Questão 6 de 14

1

First ionisation enthalpy ❌ across a period since the atoms ❌ in size meaning there are ❌ in the nucleus. The outer shell electrons are roughly the same distance from the nucleus since they are in the same shell so the attraction to the electrons is ❌ to they are ❌ to remove.

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increases

decreases

increase

decrease

more protons & neutrons

less protons & neutrons

greater

weaker

more difficult

easier

Explicação

Questão 7 de 14

1

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Rate of reaction decreases as temperature decreases since the molecules have kinetic energy so there will be fewer collisions with sufficient acitvation and also fewer collisions per second.

Explicação

Questão 8 de 14

1

An equilibrium reaction is exothermic, increasing the temperature will shift the position of equilibrium in the ❌ direction (to the ❌) which will mean the concentration of product will ❌.

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endothermic

exothermic

left

right

decrease

increase

Explicação

Questão 9 de 14

1

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% yield may be low if the reaction gone to completion or if there was of materials when transfering between vessels.

Explicação

Questão 10 de 14

1

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Reactions go at higher temperatures since the particles have kinetic energy and a larger proportion have enough kinetic energy for collisions to take place therefore the rate of reaction is .

Explicação

Questão 11 de 14

1

When doing recrystallisation you must ensure the solute has a ❌ solubility in your chosen solvent at a high temperature & a ❌ solubility in cold. You must dissolve the ❌ amount of solute in the hot solvent. ❌ the hot solution to remove insoluble impurities and leave to ❌ so soluble impurities are removed then filter off the crystals and ❌ them.

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high

low

minimum

maximum

cool

Filter

dry

Explicação

Questão 12 de 14

1

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Nuclear is when to light nuclei form a heavier nucleus. It must be done at a temperature and pressure to overcome the repulsion between the nuclei.

Explicação

Questão 13 de 14

1

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A reason for an enthalpy change of combustion to be much less than the predicted value is combustion or evapouration of fuel from the .

Explicação

Questão 14 de 14

1

Dynamic equilibrium is where the rate of the forward reaction ❌ to rate of the backward reaction so that the overall concentrations of substances ❌.

Arraste e solte para completar o texto.

is equal

is faster

is slower

is constant

changes

	Criado por Alex Lyes aproximadamente 8 anos atrás

A-Level Chemistry Quiz sobre OCR B A Level Chemistry Specimen Papers Questions, criado por Alex Lyes em 24-05-2016.

OCR B A Level Chemistry Specimen Papers Questions

Questão 1 de 14

Preencha os espaços em branco para completar o texto.

A flame test should be carried out using a wire and HCl. If it was calcium that was being tested the flame would be .

Explicação

Questão 2 de 14

Preencha os espaços em branco para completar o texto.

To test for the presence of iron(III) chloride in a sample of limestone you would add a solution of nitrate to the sample and a precipitate will be formed for the chloride ions. You would also do a test for the Fe(III) by adding giving a precipirate.

Explicação

Questão 3 de 14

Preencha o espaço em branco para completar o texto.

The reagent used with sodium iodide to produce purer hydrogen iodide is .

Explicação

Questão 4 de 14

Preencha o espaço em branco para completar o texto.

The absorption of UV radiation by ozone is important for human life since UV radiation causes damage to .

Explicação

Questão 5 de 14

The shape of an ozone molecule is ❌ because there are ❌ groups of electrons around a central O atom. The bond angle could be ❌.

Arraste e solte para completar o texto.

Explicação

Questão 6 de 14

First ionisation enthalpy ❌ across a period since the atoms ❌ in size meaning there are ❌ in the nucleus. The outer shell electrons are roughly the same distance from the nucleus since they are in the same shell so the attraction to the electrons is ❌ to they are ❌ to remove.

Arraste e solte para completar o texto.

Explicação

Questão 7 de 14

Preencha os espaços em branco para completar o texto.

Rate of reaction decreases as temperature decreases since the molecules have kinetic energy so there will be fewer collisions with sufficient acitvation and also fewer collisions per second.

Explicação

Questão 8 de 14

An equilibrium reaction is exothermic, increasing the temperature will shift the position of equilibrium in the ❌ direction (to the ❌) which will mean the concentration of product will ❌.

Arraste e solte para completar o texto.

Explicação

Questão 9 de 14

Preencha os espaços em branco para completar o texto.

% yield may be low if the reaction gone to completion or if there was of materials when transfering between vessels.

Explicação

Questão 10 de 14

Preencha os espaços em branco para completar o texto.

Reactions go at higher temperatures since the particles have kinetic energy and a larger proportion have enough kinetic energy for collisions to take place therefore the rate of reaction is .

Explicação

Questão 11 de 14

Arraste e solte para completar o texto.

Explicação

Questão 12 de 14

Preencha os espaços em branco para completar o texto.

Nuclear is when to light nuclei form a heavier nucleus. It must be done at a temperature and pressure to overcome the repulsion between the nuclei.

Explicação

Questão 13 de 14

Preencha os espaços em branco para completar o texto.

A reason for an enthalpy change of combustion to be much less than the predicted value is combustion or evapouration of fuel from the .

Explicação

Questão 14 de 14

Dynamic equilibrium is where the rate of the forward reaction ❌ to rate of the backward reaction so that the overall concentrations of substances ❌.

Arraste e solte para completar o texto.

Explicação