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Review Energetics questions for Chemistry, with correct answers shown and coverage across where does an exothermic reaction transfer energy; where does an endothermic reaction take energy from; what usually happens to the surroundings during an exothermic reaction.

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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

Which bond-energy balance makes a reaction exothermic?
  1. Making bonds releases more than breaking bonds absorbs
  2. Breaking bonds absorbs more than making bonds releases
  3. Making and breaking bonds transfer equal energy
  4. Activation energy is greater than product energy

Question 13

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 14

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 15

How does a catalyst speed up a reaction?
  1. It provides a lower-activation-energy pathway
  2. It increases the mass of reactants
  3. It raises the energy of products
  4. It is used up to release extra heat

Question 16

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 17

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

Question 18

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

Question 19

Why does an instant cold pack feel cold?
  1. Its reaction absorbs thermal energy from the skin
  2. Its reaction releases thermal energy to the skin
  3. Its contents evaporate from the skin
  4. Its insulation prevents energy transfer

Question 20

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 21

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 22

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 23

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

Question 24

Why can a catalyst be reused?
  1. It remains chemically unchanged
  2. It becomes one of the products
  3. It stores the activation energy
  4. It increases in mass during reaction

Question 25

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 26

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 27

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 28

Why does a chemical hand warmer feel hot?
  1. An exothermic reaction transfers energy to the skin
  2. An endothermic reaction takes energy from the skin
  3. Melting absorbs energy from the skin
  4. Insulation creates thermal energy inside it

Question 29

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 30

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 where does an exothermic reaction transfer energy; where does an endothermic reaction take energy from; what usually happens to the surroundings during an exothermic reaction.

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