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GCSE (Edexcel) Chemistry Test sobre Edexcel (9-1) Topic 5, creado por https:// revisechemistry.uk el 24/03/2018.

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Edexcel (9-1) Topic 5

Pregunta 1 de 15

1

Where are the transition metals found in the periodic table?

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 2 de 15

1

What two things must be present for iron to rust?

Selecciona una o más de las siguientes respuestas posibles:

  • oxygen

  • water

  • carbon dioxide

  • ethanol

  • calcium carbonate

Explicación

Pregunta 3 de 15

1

Why are alloys typically stiffer than pure metals?

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 4 de 15

1

Rellena el espacio en blanco para completar el 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?

%

Explicación

Pregunta 5 de 15

1

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

Selecciona una de las siguientes respuestas posibles:

  • The top pan balance was faulty

  • The reaction forms more than one product

  • Some of the product was lost during pouring liquids

Explicación

Pregunta 6 de 15

1

Rellena el espacio en blanco para completar el 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?

%

Explicación

Pregunta 7 de 15

1

Rellena el espacio en blanco para completar el texto.

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

dm3

Explicación

Pregunta 8 de 15

1

Rellena el espacio en blanco para completar el 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

Explicación

Pregunta 9 de 15

1

Rellena el espacio en blanco para completar el 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

Explicación

Pregunta 10 de 15

1

Rellena los espacios en blanco para completar el texto.

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

Explicación

Pregunta 11 de 15

1

Which of the following statements about dynamic equilibrium is true?

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 12 de 15

1

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

Selecciona una de las siguientes respuestas posibles:

  • The yield of product formed

  • The relative formula mass of the products

  • The uses for any by-products formed

Explicación

Pregunta 13 de 15

1

Rellena el espacio en blanco para completar el texto.

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

Explicación

Pregunta 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)

Arrastra y suelta para completar el texto.

    air
    oxygen
    nitrogen
    water
    metal
    iron

Explicación

Pregunta 15 de 15

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

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