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Chemistry(: > 17 - 1 > Flashcards

17 - 1 Flashcards

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0
Q

Define heat

A

Sum total of the KE of all particles in a sample of matter

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1
Q

What is thermochemistry?

A

The study of heat changes that accompany chemical rxns & physical changes

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2
Q

Where does heat flow from?

A

High concentration to low concentration

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3
Q

What is heat measured with?

A

Calorimeter

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4
Q

What is a calorimeter?

A

Contains water in an insulated vessel

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5
Q

Where does a rxn occur?

A

In a known mass of H2O

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6
Q

Heat absorbed or released by H2O is equal to what?

A

That absorbed OR released by a rxn

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7
Q

Define tempature?

A

Measures the average KE of particles in a sample of matter

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8
Q

What unit is tempature in?

A

Joules

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9
Q

What is KE formula?

A

1J=(n)(m)

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10
Q

What is one newton equal to?

A

1N=(kg)(m)/sec^2

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11
Q

What is 1J equal to?

A

(Kj)(m^2)/sec^2

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12
Q

Define specific heat

A

Amount of heat beg required to raise T of a substance by 1 degree Celsius or kelvin

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13
Q

What is the symbol for specific heat?

A

Cp

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14
Q

What are the units for Cp?

A

Joules/(g)(k)

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15
Q

What substance has the highest specific heat?

A

Water

16
Q

What is waters specific heat?

A

4.18 joules/(g)(k)

17
Q

Define heat capacity

A

The ability of a material to absorb heat

18
Q

What is one I the specific heat calcs?

A

Cp=q/(m) TRIANGLE T

19
Q

q=

A

(Cp)(m)(TRIANGLE T)

20
Q

Triangle T=

A

Q/m•Cp

21
Q

What heat of rxn AKA?

A

Enthalpy

22
Q

Define heat of rxn

A

Amount of heat absorbed or released in a chem rxn

23
Q

Heat of rxn is the difference…

A

In heat between the stored nrg of the reactions & that of the products

24
Q

Define exothermic

A

Heat is released & feels hot

25
Q

What is TRIANGLE H when exothermic?

A

Negative as heat is lost

26
Q

Exothermic reactants have what?

A

Higher heat content than products

27
Q

Define endothermic

A

Heat is absorbed

28
Q

What is TRAINGLE H when endothermic?

A

Positive as heat is gained

29
Q

Endothermic products have what?

A

Higher heat content than reactants

30
Q

How do you determine endothermic heat?

A

TRIANGLE H is negative as heat is lost

31
Q

When TRIANGLE H is a high negative value what’s formed & how?

A

A stable compound

Vigorously & spontaneously

32
Q

What is released when a product is formed?

A

Nrg released

33
Q

What do reactants most commonly do?

A

Gain stability

34
Q

When TRIANGLE H is a + or low negative what is true?

A

Unstable compound may form & may decompose violently

35
Q

Define heat of combustion

A

Heat released by the complete combustion of 1 mol of a substance

Chemistry(: (5 decks)

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