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Chemistry > 5.2 Energetics > Flashcards

5.2 Energetics Flashcards

1
Q

What is an enthalpy change?

A

In a reaction the heat energy it release or absorbs per mole

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2
Q

What is endothermic?

A

Heat energy absorbed

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3
Q

What is exothermic?

A

Heat energy released

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4
Q

What does breaking bonds do?

A

Absorbs energy - endothermic

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5
Q

What does making bonds do?

A

Releases energy - exothermic

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6
Q

What happens to the products when an endothermic reaction occurs?

A

Products have more energy than reactants

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7
Q

What happens to the products in an exothermic reaction?

A

Products have less energy than reactants

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8
Q

What is a principle of calorimetry?

A

It is a reaction carried out near water

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9
Q

What is calorimetry?

A

An experimental method used to measure enthalpy change

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10
Q

What happens in calorimetry in an exothermic reaction?

A
  • Reaction releases heat energy
  • Heat energy is absorbed by nearby water
  • Temperature of water increases
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11
Q

What is the simplest type of calorimetry?

A

Combusting a fuel to heat up water

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12
Q

Calorimetry combustion method

A

1) Weigh out 50g of water and place in a can above burner
2) Measure initial mass of burner and initial water temp
3) Ignite burner, stir water for 30s, extinguish burner
4) Measure final mass of burner and final temp of water

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13
Q

What are the two significant sources of error in a calorimetry combustion experiment?

A
  • Heat loss - energy dissipates into air instead of water
  • Incomplete combustion - releases less heat energy than expected
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14
Q

What is solution calorimetry?

A

Reaction dissolved in water

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15
Q

What is the method for solution calorimetry?

A

1) Pipette of 25cm3 of CuSo4 into a polystyrene cup
2) Measure initial temp of suction
3) Add 1g of Mg and stir continuously
4) Measure the maximum temp of solution

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16
Q

What is a source of error in a solution calorimetry?

A

Water is no longer pure, meaning inaccurate specific heat capacity

17
Q

How do you do a calorimetry with an endothermic reaction?

A

In a solution

18
Q

What are the results of an endothermic calorimetry experiment?

A

Results in a negative temperature change for the water

18
Q

How does a calorimetry endothermic reaction work?

A

The reaction absorbs heat energy from the water, so the water cools down

Chemistry (18 decks)

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