Year 10 Energy changes

1

Identify the type of change for the reaction: NaCl(s) + H₂O(l) → NaCl(aq)
a salts dissolving in water b neutralisation reactions c displacement reactions d precipitation reactions

1

Identify the type of change for the reaction: NaOH + HCl → NaCl + H₂O
a salts dissolving in water b neutralisation reactions c displacement reactions d precipitation reactions

1

Identify the type of change for the following reaction: Cl₂ + 2NaBr → 2NaCl + Br₂
a salts dissolving in water
b neutralisation reactions
c displacement reactions
d precipitation reactions

1

Identify the type of change for the following reaction: Fe + CuSO₄ → FeSO₄ + Cu
a salts dissolving in water b neutralisation reactions c displacement reactions d precipitation reactions

1

Identify the type of change for the reaction: AgNO₃(aq) + NaCl(aq) → NaNO₃(aq) + AgCl(s)
Hint - look at the state symbols

a) salts dissolving in water

b neutralisation reactions

c) neutralisation reactions

d precipitation reactions

1

In an exothermic reaction, heat energy is:_________________ to the surroundings.

Given out

Taken in

Unchanged

1

In an endothermic reaction, heat energy is:________________________ from the surroundings.

Given out

Taken in

Unchanged

1

Bond breaking is:

Endothermic

Exothermic

1

Bond forming is:

Endothermic

Exothermic

1

In an exothermic reaction:

Bond breaking energy > bond making energy

Bond breaking energy < bond making energy

1

In an endothermic reaction:

Bond breaking energy > bond making energy

Bond breaking energy < bond making energy

1

Mmuae Afoforo a Wobɛpaw:

activation

4

Mmuae Afoforo a Wobɛpaw:

exothermic

products

reactants

endothermic

activation

1

Mmuae Afoforo a Wobɛpaw:

activation

products

exothermic

reactants

endothermic

1

Which letter represents the activation energy? A, B, or C? (1 Point)

A

B

C

1

Which letter represents the overall energy change? (1 Point)

1

Which letter represents the energy change for breaking bonds? A, B, or C? (1 Point)

A

B

C

1

Which letter represents the energy change for making bonds?
Note the arrow should be going downwards but this was a multiple choice question.

A

B

C

1

The energy change is endothermic or exothermic. (1 Point)

1

In this change, would the surroundings get hotter or cooler?
exothermic

1

In this change, the temperature of the surroundings would (1 Point) increase or decrease?

increase

decrease

1

Mmuae Afoforo a Wobɛpaw:

decrease

B

increase

exothermic

A

endothermic

B

1

Which letter represents the activation energy?

A

B

C

D

1

Which letter represents the energy needed to break the bonds in the reactants? A, B, or C? (1 Point)

A

B

C

1

Which letter represents the energy needed to form the bonds in the products? (1 Point)

A

B

C

1

Which letter represents the energy change for the reaction? (1 Point)

1

The temperature of the surroundings will:

Increase

Decrease

Remain the same

1

Please choose the correct statement.

Energy taken in to break bonds in the reactants is greater than the energy released when new bonds form in the products.

Energy taken in to break bonds in the reactants is less than the energy released when new bonds form in the products.

6

1

Draggable item		Corresponding Item
Sum of energy to make bonds		4 x C-H + Cl-Cl
Bond broken =		= 4 x 413 + 243
Energy change formula		= 1895 kJ / mol
Energy to make bonds		3 x C-H + 1 x C-Cl + H-Cl
Energy change calculation		= 3 x 413 + 327 + 432
Reaction is		= 1998
Bonds made =		= bonds broken - bonds made
Energy change value		1895 - 1998
Energy to break bonds		-103 kJ/mol
Sum of energy to break bonds		exothermic

Year 10 Energy changes

Identify the type of change for the reaction: NaCl(s) + H₂O(l) → NaCl(aq)a salts dissolving in water b neutralisation reactions c displacement reactions d precipitation reactions

Identify the type of change for the reaction: NaOH + HCl → NaCl + H₂Oa salts dissolving in water b neutralisation reactions c displacement reactions d precipitation reactions

Identify the type of change for the following reaction: Cl₂ + 2NaBr → 2NaCl + Br₂a salts dissolving in waterb neutralisation reactionsc displacement reactions d precipitation reactions

Identify the type of change for the following reaction: Fe + CuSO₄ → FeSO₄ + Cua salts dissolving in water b neutralisation reactions c displacement reactions d precipitation reactions

Identify the type of change for the reaction: AgNO₃(aq) + NaCl(aq) → NaNO₃(aq) + AgCl(s)Hint - look at the state symbols

In an exothermic reaction, heat energy is:_________________ to the surroundings.

In an endothermic reaction, heat energy is:________________________ from the surroundings.

Bond breaking is:

Bond forming is:

In an exothermic reaction:

In an endothermic reaction:

Which letter represents the activation energy? A, B, or C? (1 Point)

Which letter represents the overall energy change? (1 Point)

Which letter represents the energy change for breaking bonds? A, B, or C? (1 Point)

Which letter represents the energy change for making bonds? Note the arrow should be going downwards but this was a multiple choice question.

The energy change is endothermic or exothermic. (1 Point)

In this change, would the surroundings get hotter or cooler?exothermic

In this change, the temperature of the surroundings would (1 Point) increase or decrease?

Which letter represents the activation energy?

Which letter represents the energy needed to break the bonds in the reactants? A, B, or C? (1 Point)

Which letter represents the energy needed to form the bonds in the products? (1 Point)

Which letter represents the energy change for the reaction? (1 Point)

The temperature of the surroundings will:

Please choose the correct statement.

Identify the type of change for the reaction: NaCl(s) + H₂O(l) → NaCl(aq)a salts dissolving in water b neutralisation reactions c displacement reactions d precipitation reactions

Identify the type of change for the reaction: NaOH + HCl → NaCl + H₂Oa salts dissolving in water b neutralisation reactions c displacement reactions d precipitation reactions

Identify the type of change for the following reaction: Cl₂ + 2NaBr → 2NaCl + Br₂a salts dissolving in waterb neutralisation reactionsc displacement reactions d precipitation reactions

Identify the type of change for the following reaction: Fe + CuSO₄ → FeSO₄ + Cua salts dissolving in water b neutralisation reactions c displacement reactions d precipitation reactions

Identify the type of change for the reaction: AgNO₃(aq) + NaCl(aq) → NaNO₃(aq) + AgCl(s)Hint - look at the state symbols

In an exothermic reaction, heat energy is:_________________ to the surroundings.

In an endothermic reaction, heat energy is:________________________ from the surroundings.

Bond breaking is:

Bond forming is:

In an exothermic reaction:

In an endothermic reaction:

Which letter represents the activation energy? A, B, or C? (1 Point)

Which letter represents the overall energy change? (1 Point)

Which letter represents the energy change for breaking bonds? A, B, or C? (1 Point)

Which letter represents the energy change for making bonds? Note the arrow should be going downwards but this was a multiple choice question.

The energy change is endothermic or exothermic. (1 Point)

In this change, would the surroundings get hotter or cooler?exothermic

In this change, the temperature of the surroundings would (1 Point) increase or decrease?

Which letter represents the activation energy?

Which letter represents the energy needed to break the bonds in the reactants? A, B, or C? (1 Point)

Which letter represents the energy needed to form the bonds in the products? (1 Point)

Which letter represents the energy change for the reaction? (1 Point)

The temperature of the surroundings will:

Please choose the correct statement.

Identify the type of change for the reaction: NaCl(s) + H₂O(l) → NaCl(aq)
a salts dissolving in water b neutralisation reactions c displacement reactions d precipitation reactions

Identify the type of change for the reaction: NaOH + HCl → NaCl + H₂O
a salts dissolving in water b neutralisation reactions c displacement reactions d precipitation reactions

Identify the type of change for the following reaction: Cl₂ + 2NaBr → 2NaCl + Br₂
a salts dissolving in water
b neutralisation reactions
c displacement reactions
d precipitation reactions

Identify the type of change for the following reaction: Fe + CuSO₄ → FeSO₄ + Cu
a salts dissolving in water b neutralisation reactions c displacement reactions d precipitation reactions

Identify the type of change for the reaction: AgNO₃(aq) + NaCl(aq) → NaNO₃(aq) + AgCl(s)
Hint - look at the state symbols

Which letter represents the energy change for making bonds?
Note the arrow should be going downwards but this was a multiple choice question.

In this change, would the surroundings get hotter or cooler?
exothermic

Identify the type of change for the reaction: NaCl(s) + H₂O(l) → NaCl(aq)
a salts dissolving in water b neutralisation reactions c displacement reactions d precipitation reactions

Identify the type of change for the reaction: NaOH + HCl → NaCl + H₂O
a salts dissolving in water b neutralisation reactions c displacement reactions d precipitation reactions

Identify the type of change for the following reaction: Cl₂ + 2NaBr → 2NaCl + Br₂
a salts dissolving in water
b neutralisation reactions
c displacement reactions
d precipitation reactions

Identify the type of change for the following reaction: Fe + CuSO₄ → FeSO₄ + Cu
a salts dissolving in water b neutralisation reactions c displacement reactions d precipitation reactions

Identify the type of change for the reaction: AgNO₃(aq) + NaCl(aq) → NaNO₃(aq) + AgCl(s)
Hint - look at the state symbols

Which letter represents the energy change for making bonds?
Note the arrow should be going downwards but this was a multiple choice question.

In this change, would the surroundings get hotter or cooler?
exothermic