IG Chemistry-7 Chemical energetics (7.1/7.2)

IG Chemistry-7 Chemical energetics (7.1/7.2)

Assessment

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Chemistry

9th - 12th Grade

Hard

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15 questions

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1.

FLASHCARD QUESTION

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases heat energy to the surroundings, resulting in an increase in temperature of the surroundings.

2.

FLASHCARD QUESTION

Front

What is an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs heat energy from the surroundings, resulting in a decrease in temperature of the surroundings.

3.

FLASHCARD QUESTION

Front

What is the enthalpy change (ΔH) in a chemical reaction?

Back

The enthalpy change (ΔH) is the heat content change of a system at constant pressure, indicating whether a reaction is exothermic (negative ΔH) or endothermic (positive ΔH).

4.

FLASHCARD QUESTION

Front

What happens to energy during combustion reactions?

Back

During combustion reactions, energy is released in the form of heat and light, making them exothermic.

5.

FLASHCARD QUESTION

Front

What is the significance of the negative sign in ΔH = -572 kJ/mol for the combustion of hydrogen?

Back

The negative sign indicates that the reaction releases 572 kJ of energy per mole of hydrogen burned, confirming it is an exothermic reaction.

6.

FLASHCARD QUESTION

Front

How do you calculate the total energy released in a reaction?

Back

To calculate the total energy released, multiply the enthalpy change (ΔH) by the number of moles of reactant used.

7.

FLASHCARD QUESTION

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

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