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Chemistry > M4 topic 1: Energy Changes in Chemical Reactions > Flashcards

M4 topic 1: Energy Changes in Chemical Reactions Flashcards

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1
Q

what is a exothermic reaction

A

when heat energy is released from the system into the surroundings

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2
Q

what is a endothermic reaction

A

when heat energy is absorbed from the surroundings

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3
Q

what is temperature

A

the degree of hotness or coldness of a body

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4
Q

what is temperature measured in

A

kelvin or Celsius

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5
Q

what is heat

A

the transfer of thermal energy between objects

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6
Q

what is heat measured in

A

joules

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7
Q

what is enthalpy

A

a measure of the total energy possessed by a substance or a group of substances

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8
Q

what is the symbol for change in enthalpy

A

ΔH

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9
Q

what is the change of enthalpy in a chemical reaction

A

the heat absorbed per mole of a specified reactant or product

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10
Q

what is the equation for change in enthalpy

A

change in enthalpy(ΔH) = enthalpy of products(Hₚ ) - enthalpy of reactants (Hᵣ)

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11
Q

what is the value of ΔH in a endothermic reaction

A

positive

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12
Q

what is the value of ΔH in a exothermic reaction

A

negative

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13
Q

what is specific heat capacity

A

the amount of energy needed to increase the temperature of a specific quantity of a substance by one degree kelvin

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14
Q

what does specific heat capacity allow us to calculate

A

the quantity of heat flow from one substance to another

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15
Q

what is the equation for heat flow

A

q=mcΔT

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16
Q

what is q

A

heat energy

17
Q

what is c

A

specific heat capacity

18
Q

what is ΔT

A

change in temperature

19
Q

what happens when ΔT and q are positive (3)

A

the substance gained heat
increased in temperature
Exothermic reaction

20
Q

what happens when ΔT and q are negative (3)

A

the substance lost heat
decreased in temperature
Endothermic reaction

21
Q

what is the relationship between heat and the enthalpy of combustion

A

q= ΔH𝒸

22
Q

what is calorimetry

A

the amount of heat released or absorbed by any chemical process

Chemistry (12 decks)

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