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Chemistry > C3.3 Calculating And Explaining Energy Change > Flashcards

C3.3 Calculating And Explaining Energy Change Flashcards

0
Q

How can you change calorimetry to be better?

A

Put heat proof mats up

Copper cup

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1
Q

What’s calorimetry?

A

Testing fuels for heat exchanges

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2
Q

How do you find the energy?

A

Q=MC^T

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3
Q

What does Q=MC^T stand for?

A

Energy= mass of water x specific heat capacity (4.18) x temperature change

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4
Q

How do you find energy per mole?

A

Divide by mass

Times by Mr

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5
Q

In the reaction A+B=C+D if it’s exothermic which has a greater enthalpy?

A

Products

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6
Q

In the reaction A+B=C+D if it’s endothermic which has a greater enthalpy?

A

Reactants

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7
Q

Is a exothermic reaction a positive or negative enthalpy change?

A

Negative

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8
Q

Is a endothermic reaction a positive or negative enthalpy change?

A

Positive

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9
Q

What happens in a exoteric reaction?

A

Heat lost so temperature increase

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10
Q

In a energy change diagram which are higher products or reactants in an exothermic reaction?

A

Reactants

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11
Q

In a energy change diagram which are higher products or reactants in an endothermic reaction?

A

Products

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12
Q

Name 2 examples of exoteric reactions?

A

Combustion

Respiration

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13
Q

Give 2 examples of an endothermic reaction?

A

Thermal decomposition

Photosynthesis

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14
Q

How do you work out energy released from a reaction?

A

Bonds broken-bonds formed

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15
Q

What do catalysts do?

A

Reduce Ea

16
Q

How does a hydrogen fuel cell work?

A

Turns the hydrogen and oxygen to ions then puts an electric current through do they react and water and energy comes out

17
Q

Advantages of hydrogen fuel cells?

A 
Renewable
Cheap
Sustainable
Efficient 
No waste products
18
Q

Disadvantages of hydrogen fuel cells?

A 
Cars are more expensive
Have to get a new car
Hard to store gas
Explosive
No infrastructure

Chemistry (11 decks)

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