Energy Changes in Chemical Reactions - SS1 Chemistry Past Questions and Answers - page 1
Which of the following best describes an exothermic reaction?
A reaction that absorbs heat from the surroundings
A reaction that releases heat to the surroundings
A reaction that involves a change in temperature
A reaction that occurs spontaneously
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Which of the following is an example of an exothermic process?
Melting ice to form liquid water
Photosynthesis in plants
Electrolysis of water
Dissolving salt in water
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In an exothermic reaction, which of the following is true?
The products have a higher energy than the reactants
The reaction absorbs heat from the surroundings
The reaction feels cold to the touch
The enthalpy change (∆H) is negative
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Which of the following best describes an endothermic reaction?
A reaction that absorbs heat from the surroundings
A reaction that releases heat to the surroundings
A reaction that involves a change in temperature
A reaction that occurs spontaneously
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Which of the following is an example of an endothermic process?
Combustion of gasoline
Condensation of water vapour
Freezing of water to form ice
Mixing an acid and a base to form water and salt
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In an endothermic reaction, which of the following is true?
The products have a higher energy than the reactants
The reaction releases heat to the surroundings
The reaction feels hot to the touch
The enthalpy change (∆H) is positive
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Which of the following factors can influence the extent of heat released or absorbed in a reaction?
Temperature
Concentration of reactants
Catalysts
All of the above
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The enthalpy change (∆H) for an exothermic reaction is:
Positive
Negative
Zero
Variable, depending on the reaction
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The enthalpy change (∆H) for an endothermic reaction is:
Positive
Negative
Zero
Variable, depending on the reaction
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Which of the following is a common example of an exothermic reaction?
Rusting of iron
Photosynthesis
Melting of wax
Cooking an egg
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