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Fiziks😌 > Energy & Chemical Change > Flashcards

Energy & Chemical Change Flashcards

1
Q

What is enthalpy

A

Measurement of energy in a thermodynamic system

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2
Q

What is the formula for ∆H

A

Hf(enthalpy of products) - Hi(enthalpy of reactants)

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3
Q

What is an Endothermic reaction

A

Reaction in which heat is absorbed by system

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4
Q

What is an Exothermic reaction

A

Reaction in which heat is released in a system

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5
Q

Why do we measure the change in heat energy instead of the total amount of energy available in a system

A

It’s close to impossible to find the exact amount of heat present in a system

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6
Q

What is the relationship between reactants and products of an Endothermic reaction

A

The products have higher energy than the reactants

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7
Q

Why is the ∆H of an Endothermic reaction positive

A

Products have higher energy than the reactants

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8
Q

What is the relationship between reactants and products of an Exothermic reaction

A

The energy of the products is lower than the energy of the reactants

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9
Q

Why is ∆H of an Exothermic reaction negative

A

Products have less energy than reactants

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10
Q

What type of reaction is Condensation

A

Exothermic

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11
Q

What type of reaction is melting

A

Endothermic

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12
Q

What type of reaction is evaporation

A

Endothermic

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13
Q

What type of reaction is Combustion

A

Exothermic

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14
Q

Define thermodynamics

A

Science of relationship between heat, work, temperature and energy

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15
Q

What type of reaction occurs when bonds are formed. Why?

A

Exothermic [when bonds are formed energy is released]

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16
Q

What type of reaction occurs when bonds are broken. Why?

A

Exothermic [to break a bond, heat energy must be added]

17
Q

Name one poisonous gas produced by combustion

A

Carbon monoxide

18
Q

What is activation energy

A

Minimum amount of energy required for compound to result in chemical reaction

19
Q

What is activated complex

A

Stage where bonds in reactants are breaking while new ones are forming to create new products

20
Q

What is the formula for activation energy [Ea]

A

Ea =Activated complex - E.reactants

21
Q

When you sketch an Endothermic energy diagram at which two points does Activation energy lie in-between

A

It lies in between reactants and activated complex or between reactants and catalysts (if given)

22
Q

On an Endothermic energy diagram at which two points does ∆H lie in between

A

Reactants and products

23
Q

What is a catalyst

A

Chemical substance that lowers activation energy required without taking part in the reaction

24
Q

How do you measure energy released in an energy diagram

A

Energy released = Activated complex - products

25
Q

How do you determine energy absorbed in an energy diagram

A

Energy absorbed= Products

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