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Chemistry Grade 12 > Thermochemistry > Flashcards

Thermochemistry Flashcards

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1
Q

What is Thermochemistry?

A

the study of the energy changes that
accompany physical or chemical changes in
matter

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2
Q

What are the 3 changes that can occur in matter?

A

physical, chemical, or nuclear.

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3
Q

What is Potential Energy?

A

is described as stored energy, or energy ready to be

used.

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4
Q

What is Kinetic Energy?

A

is the energy of motion ­­it’s ability to do work.

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5
Q

Nuclear Energy is ______

A

Energy Stored

within the nucleus.

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6
Q

Intramolecular Bonds

A

Bonds between
atoms within a
molecule.

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7
Q

Intermolecular Bonds

A

Bonds between

seperate molecules

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8
Q

ΔHc Heat of Combustion is ______

A

the energy released as heat when a compound undergoes complete combustion with oxygen under standard conditions.

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9
Q

Heat Capacity is _____

A

The amount of Heat needed to raise the
temperature of an object by one degree
Celsius

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10
Q

Specific Heat Capacity of Water?

A

4.186 J/g°C

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11
Q

How Does Calorimetry Work?

A

A Bomb­Calorimeter is used to measure the heat created by a sample burned under an oxygen atmosphere in a closed vessel, which is surrounded by water, under controlled conditions (isolated system). The heat created by the combustion process is transferred into the surrounding water, and then the temperature change of the water is recorded.

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12
Q

Four Natural Forces are?

A

Gravity, Electromagnetic, Strong Nuclear and Weak Nuclear

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13
Q

Fission is ____

A

The splitting of large nuclei

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14
Q

Fusion is _____

A

The merging of two small nuclei (of Hydrogen)

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15
Q

ΔHr is ____

A

Enthalpy or Heat of Reaction is the difference in Enthalpy (Heat Content) of reactants (HR) and products (HP).

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16
Q

Exothermic is _____

A

The energy released during a reaction and raises the temperature of the surroundings. (Feels hot)

17
Q

Endothermic is _____

A

Energy is absorbed during a reaction and lowers the temperature of the surroundings. (Feels cold)

18
Q

The calculation of the Energy Change formula is ___

A 
Q= mcΔT
Q = quantity of heat ( J)
m = mass of absorbing medium (g)
c = specific heat capacity (J/g°C )
T= change in temperature of medium (°C)
19
Q

What is an Open System?

A

-can exchange both energy and

matter with its surroundings

20
Q

What is a Closed System?

A

-­No matter can enter or leave.

­-energy may be exchanged

21
Q

What is an Isolated System?

A

-No energy or matter can enter or leave

Chemistry Grade 12 (1 decks)

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