IG Chemistry-7 Chemical energetics (7.1/7.2)

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Chemistry
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9th - 12th Grade
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Hard
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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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