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
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:
What is the minimum energy needed to break the bonds in the reactants is called energy.
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.
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 .
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?
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
Total energy given out when bonds form in products
= 2x C=O + 4 x O-H
= 2 x 803 + 4 x 464
=
Energy change = energy to break bonds - energy to make bonds
= 2652 - 3462 = sign
Note this is an
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?
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.
Energy needed to break the bonds in the reactants
= 1 x N=N + 1 x O=O
= 945 + 498
=
Energy given out when bonds form in the products
= 2 x N=O
= 2x 630
=
Energy change = energy needed to break bonds - energy released when bonds form
= 1413 - 1260
= sign
The energy change is positive so the reaction is
| Draggable item | arrow_right_alt | Corresponding Item |
|---|---|---|
Sum of energy to make bonds | arrow_right_alt | 4 x C-H + Cl-Cl |
Bond broken = | arrow_right_alt | = 4 x 413 + 243 |
Energy change formula | arrow_right_alt | = 1895 kJ / mol |
Energy to make bonds | arrow_right_alt | 3 x C-H + 1 x C-Cl + H-Cl |
Energy change calculation | arrow_right_alt | = 3 x 413 + 327 + 432 |
Reaction is | arrow_right_alt | = 1998 |
Bonds made = | arrow_right_alt | = bonds broken - bonds made |
Energy change value | arrow_right_alt | 1895 - 1998 |
Energy to break bonds | arrow_right_alt | -103 kJ/mol |
Sum of energy to break bonds | arrow_right_alt | exothermic |
