Energetics questions

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Energetics question collection

Review Energetics questions for Chemistry, with correct answers shown and coverage across energy changes on melting, boiling and freezing; exothermic reactions and their effect on the surroundings; endothermic reactions and their effect on the surroundings.

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Question 1

Where does an exothermic reaction transfer energy?
  1. To the surroundings
  2. From the surroundings
  3. Into the reactants
  4. Into the catalyst

Question 2

Where does an endothermic reaction take energy from?
  1. The surroundings
  2. The products
  3. A catalyst
  4. New atoms

Question 3

What usually happens to the surroundings during an exothermic reaction?
  1. Temperature increases
  2. Temperature decreases
  3. Temperature stays unchanged
  4. Temperature first falls then rises

Question 4

What usually happens to the surroundings during an endothermic reaction?
  1. Temperature decreases
  2. Temperature increases
  3. Temperature stays unchanged
  4. Temperature first rises then falls

Question 5

Which process is typically exothermic?
  1. Combustion
  2. Thermal decomposition
  3. Photosynthesis
  4. Melting

Question 6

Which process is typically endothermic?
  1. Thermal decomposition
  2. Condensation
  3. Freezing
  4. Neutralisation

Question 7

What energy change usually occurs when an acid reacts with an alkali?
  1. Exothermic
  2. Endothermic
  3. No overall energy change
  4. A physical change

Question 8

How is photosynthesis classified?
  1. Endothermic because it absorbs light energy
  2. Exothermic because it releases oxygen
  3. Exothermic because glucose stores energy
  4. Endothermic because it absorbs carbon dioxide

Question 9

How is cellular respiration classified?
  1. Exothermic reaction
  2. Endothermic reaction
  3. Physical change
  4. Reversible change

Question 10

What happens to energy when chemical bonds break?
  1. Energy is absorbed
  2. Energy is released
  3. Energy is unchanged
  4. Energy becomes a catalyst

Question 11

What happens to energy when chemical bonds form?
  1. Energy is released
  2. Energy is absorbed
  3. Energy is unchanged
  4. Energy becomes a reactant

Question 12

Where are products shown on an exothermic reaction profile?
  1. Lower than the reactants
  2. Higher than the reactants
  3. Level with the reactants
  4. At the activation-energy peak

Question 13

What is activation energy?
  1. The minimum energy needed for particles to react
  2. The total energy released in all reactions
  3. The energy stored in products
  4. The energy needed to cool a reaction

Question 14

Which setup best measures a reaction's temperature change?
  1. Insulated cup, lid and thermometer
  2. Uninsulated beaker and thermometer
  3. Insulated cup and stopwatch
  4. Metal tray and balance

Question 15

Which change of state is endothermic?
  1. Melting
  2. Freezing
  3. Condensation
  4. Deposition

Question 16

Which change of state is exothermic?
  1. Condensation
  2. Boiling
  3. Sublimation
  4. Melting

Question 17

What is the symbol equation for the burning of methane?
  1. \(\mathrm{CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O}\)
  2. \(\mathrm{CH_4 + O_2 \rightarrow CO + H_2}\)
  3. \(\mathrm{CH_4 + 2O_2 \rightarrow C + 2H_2O}\)
  4. \(\mathrm{2CH_4 + O_2 \rightarrow 2CO_2 + 2H_2O}\)

Question 18

Where are products shown on an endothermic reaction profile?
  1. Higher than the reactants
  2. Lower than the reactants
  3. Level with the reactants
  4. At the activation-energy peak

Question 19

What does the vertical difference between reactants and products show?
  1. The overall energy change
  2. The activation energy
  3. The reaction rate
  4. The catalyst mass

Question 20

Which energy store supplies energy when a fuel burns?
  1. Chemical store
  2. Thermal store
  3. Kinetic store
  4. Gravitational store

Question 21

Why put a lid on a reaction calorimeter?
  1. Reduce thermal transfer to the surroundings
  2. Increase the reaction's activation energy
  3. Make the thermometer respond faster
  4. Prevent the reactants forming bonds

Question 22

Why repeat a reaction temperature experiment?
  1. Identify anomalies and calculate a mean
  2. Increase the reaction's energy change
  3. Lower the activation energy each time
  4. Make the products more stable

Question 23

A reaction warms from 18 °C to 25 °C. What is the temperature change?
  1. 7 °C
  2. 43 °C
  3. −7 °C
  4. 1.4 °C

Question 24

If a forward reaction is exothermic, how is its reverse reaction classified?
  1. Endothermic
  2. Exothermic
  3. No energy change
  4. A physical change

Question 25

What does the rise from reactants to the peak of a reaction profile show?
  1. The activation energy
  2. The overall energy change
  3. The reaction temperature
  4. The product mass

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Review Energetics questions for Chemistry, with correct answers shown and coverage across energy changes on melting, boiling and freezing; exothermic reactions and their effect on the surroundings; endothermic reactions and their effect on the surroundings.

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