C3.3 Flashcards

1
Q

What can be measured by simple calorimetry

A

The relative amounts of energy released when substances burn

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2
Q

What two things can simple calorimetry be used for

A

Heating water in a glass or metal container

To compare the amount of energy released by fuels and foods

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3
Q

What is energy measured in

A

Joules

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4
Q

Where can the amount of energy released or absorbed by a chemical reaction in a solution be calculated from

A

The measured temperature change of the solution when the reagents are mixed in an insulated container

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5
Q

What method can be used for reactions of solids with water or for neutralisation reactions

A

Measuring the temperature change of the solution where the reagents are mixed in an insulated container.

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6
Q

What can simple energy level diagrams be used to show

A

The relative energies of reactants and products, the activation energy and the overall energy change of a reaction

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7
Q

What two things happens during a chemical reaction

A

Energy must be supplied to break bonds

Energy is released when bonds are formed

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8
Q

What is an exothermic reaction

A

The energy released from forming new bonds is greater than the energy needed to break existing bonds

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9
Q

What is an endothermic reaction

A

The energy needed to break existing bonds is greater than the energy released from forming new bonds

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10
Q

What do catalyst provide

A

A different pathway for a chemical reaction that has a lower activation energy

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11
Q

What can 3 things can hydrogen be used for

A

When burnt, as a fuel in a combustion engines

In fuel cells that produce electricity to power vehicles

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12
Q

Hydrogen + oxygen =

A

Water

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