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Energy Changes in Chemical Reactions - SS1 Chemistry Past Questions and Answers - page 1

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Which of the following best describes an exothermic reaction?

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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?

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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?

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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?

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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?

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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?

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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?

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Temperature

Concentration of reactants

Catalysts

All of the above

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The enthalpy change (∆H) for an exothermic reaction is:

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Positive

Negative

Zero

Variable, depending on the reaction

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The enthalpy change (∆H) for an endothermic reaction is:

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Positive

Negative

Zero

Variable, depending on the reaction

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Which of the following is a common example of an exothermic reaction?

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Rusting of iron

Photosynthesis

Melting of wax

Cooking an egg

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