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Chemistry 30 > 11.1 - 11.2 > Flashcards

11.1 - 11.2 Flashcards

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1
Q

What does the law of conservation of energy state?

A

Energy is neither created or destroyed, only converted from one form to another

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2
Q

What is thermochemistry?

A

The study of energy changes produced by a chemical reaction

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3
Q

What is an isolated system?

A

A system where neither matter nor energy can move out

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4
Q

What is calorimetry?

A

The technological process of measuring energy changes of an isolated system called a calorimeter

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5
Q

What is the chemical system?

A

The reactants and the products

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6
Q

What are the surroundings?

A

The water in the beaker

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7
Q

What is thermal energy?

A

The total kinetic energy of the entities of a substance

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8
Q

What is the formula for the quantity of thermal energy transferred (Q)?

A

Q = mcΔt

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9
Q

What is c is the chemical formula for the quantity of thermal energy transferred?

A

c = specific heat capacity

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10
Q

What is specific heat capacity?

A

The quantity of energy required to raise the temperature of the unit mass of a substance by one degree celcius

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11
Q

What are the units for specific heat capacity?

A

J/(gC)

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12
Q

What are examples of kinetic energy?

A

Moving electrons within atoms
The vibrations of atoms connected by chemical bonds
The rotation and translation of molecules that are made of atoms

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13
Q

What are examples of chemical potential energy?

A

Covalent and ionic bonds between entities

Intermolecular forces between entities

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14
Q

What is enthalpy?

A

The total kinetic and potential energy within a chemical system

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15
Q

What does an enthalpy change communicate?

A

The difference between enthalpy of the products and enthalpy of reactants

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16
Q

What is the formula for the change in enthalpy?

A

Enthalpy of products - Enthalpy of reactants

17
Q

What is Enthalpy change equal to?

A

The quantity of thermal energy transferred (Q)

18
Q

What is an exothermic reaction?

A

A change that produces energy, the enthalpy change is negative

19
Q

What is an endothermic reaction?

A

A reaction that absorbs energy, the enthalpy change is positive

20
Q

What is enthalpy of reaction?

A

The energy change for a whole chemical system when reactants change to products

21
Q

What is molar enthalpy of reaction?

A

The enthalpy change in a chemical system per unit chemical amount (mole)

22
Q

What is enthalpy change measured in?

A

kJ per mole

23
Q

What is the formula for enthalpy change of a reaction?

A

ΔH = nΔHm

24
Q

What is the change in enthalpy of a chemical system equal to?

A 
ΔH = Q
nΔHm = mcΔt

Chemistry 30 (25 decks)

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