Year 10 Energy changes

Last updated 10 months ago

31 questions

1

4

1

6

1

Library

Year 10 Energy changes

Last updated 10 months ago

31 questions

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

What is the minimum energy needed to break the bonds in the reactants is called _______________energy.

Other Answer Choices:

activation

4

Combustion of methane
This is a reaction profile diagram for an _______________  reaction. (1 Point)
Energy needed to break the bonds in the ______________(the  _______________energy) 
is less than the energy released when the bonds form in the _____________. 
Copy this diagram and explanation into your exercise books.

Other Answer Choices:

reactants

products

exothermic

endothermic

activation

1

Respiration
This is a reaction profile diagram for an _______________  reaction. (1 Point)
Energy needed to break the bonds in the ______________(the  _______________energy) 
is less than the energy released when the bonds form in the _____________. 

Other Answer Choices:

exothermic

endothermic

products

activation

reactants

1

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

1

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

1

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

1

Calculate the energy change. 

Total energy taken in to break bonds in the reactants

 = 4 x C-H + 2 x O=O
= 4 x 414 + 2 x 498 = 2652_______ kJ / mol
Total energy given out when bonds form in products

= 2x C=O + 4 x O-H
= 2 x 803 + 4 x 464
= _______ kJ/mol
Energy change = energy to break bonds - energy to make bonds
= 2652 - 3462 = sign _______ value _______ kJ/mol.
Note this is an _______ reaction so energy is released to the surroundings and the temperature of the surroundings _______ 

1

Other Answer Choices:

A

exothermic

decrease

endothermic

B

increase

1

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

1

6

Energy needed to break the bonds in the reactants
= 1 x N=N + 1 x O=O
= 945 + 498
= _______ kJ/mol
Energy given out when bonds form in the products
= 2 x N=O
= 2x 630
= _______ kJ/mol
Energy change = energy needed to break bonds - energy released when bonds form
= 1413 - 1260
= sign _______ value _______  
The energy change is positive so the reaction is _______ and the temperature of the surroundings will _______ 

1

Draggable item		Corresponding Item

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

a) salts dissolving in water

b neutralisation reactions

c) neutralisation reactions

d precipitation reactions

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

Given out

Taken in

Unchanged

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

Given out

Taken in

Unchanged

Bond breaking is:

Endothermic

Exothermic

Bond forming is:

Endothermic

Exothermic

In an exothermic reaction:

Bond breaking energy > bond making energy

Bond breaking energy < bond making energy

In an endothermic reaction:

Bond breaking energy > bond making energy

Bond breaking energy < bond making energy

What is the minimum energy needed to break the bonds in the reactants is called _______________energy.

Other Answer Choices:

activation

Combustion of methane
This is a reaction profile diagram for an _______________  reaction. (1 Point)
Energy needed to break the bonds in the ______________(the  _______________energy) 
is less than the energy released when the bonds form in the _____________. 
Copy this diagram and explanation into your exercise books.

Other Answer Choices:

reactants

products

exothermic

endothermic

activation

Respiration
This is a reaction profile diagram for an _______________  reaction. (1 Point)
Energy needed to break the bonds in the ______________(the  _______________energy) 
is less than the energy released when the bonds form in the _____________. 

Other Answer Choices:

exothermic

endothermic

products

activation

reactants

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

A

B

C

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

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

A

B

C

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

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?

increase

decrease

Calculate the energy change. 

Total energy taken in to break bonds in the reactants

 = 4 x C-H + 2 x O=O
= 4 x 414 + 2 x 498 = 2652_______ kJ / mol
Total energy given out when bonds form in products

= 2x C=O + 4 x O-H
= 2 x 803 + 4 x 464
= _______ kJ/mol
Energy change = energy to break bonds - energy to make bonds
= 2652 - 3462 = sign _______ value _______ kJ/mol.
Note this is an _______ reaction so energy is released to the surroundings and the temperature of the surroundings _______ 

This reaction profile shows an ________________  reaction.
Activation energy  = ______
Energy needed to break bonds in reactants =  ______ 
Energy released when new bonds form in the products = ______ 
Energy change in the reaction = ______ 
Energy in to break bonds is less than energy released to make bonds so the reaction is ________________.
The reaction takes in energy so the surrounding will lose energy and the temperature will _____________  

Other Answer Choices:

A

exothermic

decrease

endothermic

B

increase

Which letter represents the activation energy?

A

B

C

D

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

A

B

C

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

A

B

C

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

The temperature of the surroundings will:

Increase

Decrease

Remain the same

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.

Energy needed to break the bonds in the reactants
= 1 x N=N + 1 x O=O
= 945 + 498
= _______ kJ/mol
Energy given out when bonds form in the products
= 2 x N=O
= 2x 630
= _______ kJ/mol
Energy change = energy needed to break bonds - energy released when bonds form
= 1413 - 1260
= sign _______ value _______  
The energy change is positive so the reaction is _______ and the temperature of the surroundings will _______ 

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

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

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

Given out

Taken in

Unchanged

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

Given out

Taken in

Unchanged

Bond breaking is:

Endothermic

Exothermic

Bond forming is:

Endothermic

Exothermic

In an exothermic reaction:

Bond breaking energy > bond making energy

Bond breaking energy < bond making energy

In an endothermic reaction:

Bond breaking energy > bond making energy

Bond breaking energy < bond making energy

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

A

B

C

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

A

B

C

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

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

increase

decrease

This reaction profile shows an ________________  reaction.
Activation energy  = ______
Energy needed to break bonds in reactants =  ______ 
Energy released when new bonds form in the products = ______ 
Energy change in the reaction = ______ 
Energy in to break bonds is less than energy released to make bonds so the reaction is ________________.
The reaction takes in energy so the surrounding will lose energy and the temperature will _____________  

Which letter represents the activation energy?

A

B

C

D

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

A

B

C

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

A

B

C

The temperature of the surroundings will:

Increase

Decrease

Remain the same

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.

Reaction is 

4 x C-H + Cl-Cl

Sum of energy to make bonds

= 4 x 413 + 243

Energy change calculation

= 1895 kJ / mol

Energy to break bonds 

3 x C-H + 1 x C-Cl + H-Cl

Bonds made =

= 3 x 413 + 327 + 432

Bond broken =

= 1998

Sum of energy to break bonds

= bonds broken - bonds made

Energy to make bonds 

1895 - 1998

Energy change formula

-103 kJ/mol

Energy change value

exothermic

Year 10 Energy changes

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

Combustion of methane

Respiration

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

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

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

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

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:

Combustion of methane

Respiration

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

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