Energy Change Quiz!
- 1.
Which of the following is an exothermic reaction?
- A.
Neutralisation
- B.
Photosynthesis
- C.
Melting
- D.
Dissolving of ammonium salts
Correct Answer
A. Neutralisation -
- 2.
On combustion, which fuel never produces pollutants?
- A.
Petrol
- B.
Diesel
- C.
Methane
- D.
Hydrogen
Correct Answer
D. Hydrogen -
- 3.
The formation of hydrogen iodide from hydrogen and iodine is an endothermic reaction. H - H + I - I → H - I + H - I What can you deduce from the above information?
- A.
The number of bonds broken is greater than the number of bonds formed.
- B.
The formation of H - I bonds absorbs energy.
- C.
The total energy change in bond formation is less than that in bond breaking
- D.
The products possess less energy than the reactants.
Correct Answer
C. The total energy change in bond formation is less than that in bond breaking -
- 4.
Why is the reaction H2 + Cl2 → 2HCl exothermic?
- A.
More bonds are broken than formed
- B.
More bonds are formed than broken
- C.
Energy involved in bond breaking is greater than energy involved in bond formation
- D.
Energy involved in bond formation is greater than energy involved in bond breaking
Correct Answer
D. Energy involved in bond formation is greater than energy involved in bond breaking -
- 5.
The equations for three reactions are given below 1. Na (s) → Na (l) 2. O2 (g) → 2O (g) 3. 2H (g) + O (g) → H2O (g) Which of these reaction(s) is/are endothermic?
- A.
1 only
- B.
1 and 2 only
- C.
2 and 3 only
- D.
1, 2 and 3
Correct Answer
B. 1 and 2 only -
- 6.
Which of the following change(s) is/are exothermic?
- A.
Process whereby plants make food
- B.
Change of state from gas to liquid
- C.
Reaction of potassium with water
- D.
Reaction of citric acid with sodium hydrogencarbonate
Correct Answer(s)
B. Change of state from gas to liquid
C. Reaction of potassium with water -
- 7.
Which of the following change (s) is/are endothermic?
- A.
Rusting of iron
- B.
Thermal decomposition of limestone
- C.
Thermite reaction
- D.
Change of state from solid to liquid
Correct Answer(s)
B. Thermal decomposition of limestone
D. Change of state from solid to liquid -
- 8.
Which of the following is an application of thermite reactions?
- A.
Make car batteries
- B.
Weld railway lines
- C.
Meat tenderiser
- D.
Fermentation of sugars
Correct Answer
B. Weld railway lines -
- 9.
Choose the pair of chemicals that can be use to make a cold pack
- A.
Hydrochloric acid + sodium hydroxide
- B.
Iron (III) oxide + aluminium
- C.
Zinc + copper (II) sulfate
- D.
Ammonium nitrate + water
Correct Answer
D. Ammonium nitrate + water -
- 10.
A thermometer is placed in water and gives an initial temperature of 43°C. An endothermic reaction takes place as a solid is dissolved in the water. The temperature changes by 4.5°C . What is the final temperature?
- A.
38.0°C
- B.
47.0°C
- C.
38.5°C
- D.
47.5°C
Correct Answer
C. 38.5°C -
- 11.
Which of the following does not involve a change in energy?
- A.
Mixing some iron filings with some sulfur
- B.
Adding hydrochloric acid to sodium hydroxide solution
- C.
Dissolving ammonium chloride in water
- D.
Burning a mixture of iron and sulfur
Correct Answer
A. Mixing some iron filings with some sulfur -
- 12.
Reaction 1: Solid cobalt (II) chloride turns from pink to blue when it is heated Reaction 2: When water is added to blue cobalt (II) chloride, paper, it turns pink and becomes warm Which pair of energy changes best describes these two reactions?
- A.
Reaction 1: endothermic; Reaction 2: endothermic
- B.
Reaction 1 :exothermic; Reaction 2: exothermic
- C.
Reaction 1: exothermic; Reaction 2: endothermic
- D.
Reaction 1: endothermic; Reaction 2: exothermic
Correct Answer
D. Reaction 1: endothermic; Reaction 2: exothermic -
- 13.
When solid sodium carbonate is added to water, the temperature of the mixture rises. What conclusion can be derived from this observation?
- A.
A large amount of sodium carbonate dissolves in water.
- B.
Dissolving sodium carbonate is exothermic.
- C.
The temperature rises when all solids dissolve in water.
- D.
Aqueous sodium carbonate has more energy than solid sodium carbonate
Correct Answer
B. Dissolving sodium carbonate is exothermic. -
- 14.
The equation for the extraction of iron in the blast furnace is: Fe2O3 + 3CO → 2Fe + 3CO2 (ΔH = -27kJ) Which of the following statements is true?
- A.
13.5 kJ of heat energy is absorbed
- B.
27 kJ of heat energy is absorbed
- C.
13.5 kJ of heat energy is released
- D.
27 kJ of heat energy is released
Correct Answer
C. 13.5 kJ of heat energy is released -
- 15.
The combustion of the fuel ethanol is given by the following equation: C2H5OH + 3O2 → 2CO2 + 3H2O What type of heat change occurs in the reaction?
Correct Answer
Exothermic
Exothermic heat change - 16.
The combustion of the fuel ethanol is given by the following equation: C2H5OH + 3O2 → 2CO2 + 3H2O Calculate the heat of reaction, ΔH, for the above reaction.
Correct Answer
-1380 kJ - 17.
Which statement is correct for all exothermic reactions?
- A.
A catalyst has to be added for the reaction to take place
- B.
Heat is required to start the reaction
- C.
The reactants of reaction have less energy than the products of reaction
- D.
Energy required for bond breaking is less than energy released from bond formation
Correct Answer
D. Energy required for bond breaking is less than energy released from bond formation -
- 18.
The following equation shows the direct combination of hydrogen and chlroine to produce hydrogen chloride. H2 (g) + Cl2 (g) → 2HCl (g) (ΔH = -184 kJ/mol) Which of the following occurs in this reaction?
- A.
H - H covalent bonds are broken
- B.
Cl - Cl covalent bonds are formed
- C.
Ionic bonds are formed in hydrogen chloride
- D.
H - Cl covalent bonds are formed
Correct Answer(s)
A. H - H covalent bonds are broken
D. H - Cl covalent bonds are formed -
- 19.
The equation below shows the combustion of methanol. 2CH3OH (l) +3O2 (g) → 2CO2 (g) + 4H2O (l) Which of the following bonds were broken in the combustion reaction?
- A.
Carbon-hydrogen single bond
- B.
Oxygen-oxygen double bond
- C.
Oxygen-hydrogen single bond
- D.
Carbon-carbon double bond
Correct Answer(s)
A. Carbon-hydrogen single bond
B. Oxygen-oxygen double bond
C. Oxygen-hydrogen single bond -
- 20.
The equation below shows the combustion of methanol. 2CH3OH (l) +3O2 (g) → 2CO2 (g) + 4H2O (l) Which of the following bonds were formed in the combustion reaction?
- A.
Carbon-oxygen double bond
- B.
Carbon-hydrogen single bond
- C.
Carbon-carbon double bond
- D.
Oxygen-hydrogen single bond
Correct Answer(s)
A. Carbon-oxygen double bond
D. Oxygen-hydrogen single bond -
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Mar 21, 2022Quiz Edited by
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Apr 30, 2011Quiz Created by
Caleblook
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