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GCSE Chemistry (Edexcel) Quiz sobre Edexcel (9-1) Topic 5, criado por https:// revisechemistry.uk em 24-03-2018.

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Edexcel (9-1) Topic 5

Questão 1 de 15

1

Where are the transition metals found in the periodic table?

Selecione uma das seguintes:

  • On the left of the periodic table, in groups 1 and 2

  • In the middle of the periodic table, between groups 2 and 3

  • On the right of the periodic table, in groups 7 and 8

Explicação

Questão 2 de 15

1

What two things must be present for iron to rust?

Selecione uma ou mais das seguintes:

  • oxygen

  • water

  • carbon dioxide

  • ethanol

  • calcium carbonate

Explicação

Questão 3 de 15

1

Why are alloys typically stiffer than pure metals?

Selecione uma das seguintes:

  • The metallic bonding is stronger in alloys

  • The metal atoms are all very regularly arranged in an alloy

  • The layers of metal atoms in the alloy cannot slide over each other very easily

Explicação

Questão 4 de 15

1

Preencha o espaço em branco para completar o texto.

A student had calculated the theoretical yield of a product was 8 g. The actual yield obtained was 6 g. What was the percentage yield?

%

Explicação

Questão 5 de 15

1

Which of the following could explain why the percentage yield in a chemical reaction was less than 100%?

Selecione uma das seguintes:

  • The top pan balance was faulty

  • The reaction forms more than one product

  • Some of the product was lost during pouring liquids

Explicação

Questão 6 de 15

1

Preencha o espaço em branco para completar o texto.

The RFM of the desired product in a reaction is 95. The sum of the RFM values for the reactants is 113. What is the atom economy for this reaction?

%

Explicação

Questão 7 de 15

1

Preencha o espaço em branco para completar o texto.

A solution has a volume of 650 cm3. What is the volume of this solution in dm3?

dm3

Explicação

Questão 8 de 15

1

Preencha o espaço em branco para completar o texto.

A solution of NaOH has a concentration of 0.2 mol/dm3. Calculate its concentration in g/dm3. The RFM of NaOH is 40.

g/dm3

Explicação

Questão 9 de 15

1

Preencha o espaço em branco para completar o texto.

A sample of methane gas has a volume of 120 cm3 at room temperature and pressure. The molar volume is 24 dm3. How many moles of methane are present in the sample?

moles

Explicação

Questão 10 de 15

1

Preencha os espaços em branco para completar o texto.

What does NPK stand for in terms of fertilisers?
N -
P - phosphorous
K -

Explicação

Questão 11 de 15

1

Which of the following statements about dynamic equilibrium is true?

Selecione uma das seguintes:

  • The reaction has finished

  • The forwards and reverse reactions occur at the same rate

  • The concentration of reactants is the same as the concentration of products

Explicação

Questão 12 de 15

1

Which of these factors does not affect the choice of reaction pathway in an industrial chemical manufacturing process?

Selecione uma das seguintes:

  • The yield of product formed

  • The relative formula mass of the products

  • The uses for any by-products formed

Explicação

Questão 13 de 15

1

Preencha o espaço em branco para completar o texto.

What is the only chemical product when hydrogen and oxygen are reacted together in a fuel cell?

Explicação

Questão 14 de 15

1

Rusting is a specific example of corrosion, and requires both and water for iron to rust. There are three ways to prevent iron from rusting:
- exclusion of (by either using an atmosphere of or argon)
- exclusion of (by storing with a desiccant)
- sacrificial protection (when a more reactive than iron is attached to the object to prevent from rusting)

Arraste e solte para completar o texto.

    air
    oxygen
    nitrogen
    water
    metal
    iron

Explicação

Questão 15 de 15

1

Fuel cells will produce a voltage continuously, provided they have a constant supply of fuel and oxygen (from the air).

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

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