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AS-level Chemistry (Energetics) Quiz on Calorimetry quiz, created by s_phie5 on 18/03/2014.

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Calorimetry quiz

Calorimetry quiz

Question 1 of 17

1

Is an exothermic reaction, is heat given out to the surroundings or taken in heat to the surroundings?

Select one of the following:

  • given out

  • taken in

Explanation

Question 2 of 17

1

What symbol is used to show an endothermic reaction?

Select one of the following:

  • +

  • -

Explanation

Question 3 of 17

1

Do reactants have more or less chemical energy than products in an exothermic reaction?

Select one of the following:

  • more

  • less

Explanation

Question 4 of 17

1

Enthalpy change is the heat change at a constant temperature

Select one of the following:

  • True
  • False

Explanation

Question 5 of 17

1

in enthalpy changes why are standards used?

Select one or more of the following:

  • so it doesnt affect the amount of energy of the reation taken which can affect the temp

  • so it doesnt affect the amount of energy of the reation lost which can affect the temp

  • the standard enthaply change measured depends on the reaction not on the conditions

  • so it doesnt affect the amount of energy of the reation created which can affect the temp

Explanation

Question 6 of 17

1

What are calorimeters designed for?

Select one of the following:

  • to contain reactions where all the heat produced can be exchanged with the surroundings in a measurable and accurate way

  • to contain reactions where all the energy produced can be lost to the surroundings in a measurable and accurate way

  • to start reactions, providing energy which can be exchanged with the surroundings in a measurable and accurate way

Explanation

Question 7 of 17

1

What is the equation for heat produced?

Select one of the following:

  • Heat produced= mass x specific heat capacity of water x temp rise

  • Heat produced= mass x specific heat capacity of water /temp rise

  • Heat produced= mass / specific heat capacity of water x temp rise

Explanation

Question 8 of 17

1

How do you convert J to KJ?

Select one of the following:

  • / 1000

  • x 1000

  • / 10000

Explanation

Question 9 of 17

1

what are errors in calorimetry?

Select one or more of the following:

  • heat loss to the surroundings, by the apparatus, to the solid reactant

  • the concentration/ volume of the measurement

  • incomplete reaction

  • impure reactants

  • timings

  • inaccurate stirring

Explanation

Question 10 of 17

1

How do you work out percentage error?

Select one or more of the following:

  • (difference between my value and true value/ true value) x 100

  • (difference between my value and true value/ true value) x 1000

  • ( true value/ difference between my value and true value) x 100

Explanation

Question 11 of 17

1

How do you convert q to ^_H?

Select one or more of the following:

  • ^_= q / no. moles

  • ^_= no. moles / q

  • ^_= q x no.moles

Explanation

Question 12 of 17

1

How do you convert q to ^_H?

Select one or more of the following:

  • ^_= q / no. moles

  • ^_= no. moles / q

  • ^_= q x no.moles

Explanation

Question 13 of 17

1

What is the definition of standard enthalpy change?

Select one of the following:

  • when 1 mole of compound is formed from its constituent elements under standard conditions with all substances in their standard states

  • normal states, stable under standard conditions

  • heat change at a constant pressure

Explanation

Question 14 of 17

1

sodium hydroxide reacts with HCL and the container becomes really quite warm- what kind of reaction is this?

Select one of the following:

  • endothermic

  • exothermic

Explanation

Question 15 of 17

1

What is another name for the conservation of energy?

Select one of the following:

  • Hess' Law

  • Boyle's Law

  • Heis' Law

Explanation

Question 16 of 17

1

what kind of working out would you have to use to work out ^_H implying Hess' law

Select one of the following:

  • enthalpy cycles

  • mechanisms

  • equations

Explanation

Question 17 of 17

1

In bond enthalpies bonds broken is an exothermic reaction

Select one of the following:

  • True
  • False

Explanation

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