Energetics Revision Lesson

Presentation

•

Chemistry

•

9th - 12th Grade

•

Easy

Mike Litchfield

Used 3+ times

FREE Resource

9 Slides • 37 Questions

Energetics
Revision

Defintions

Topic 8 Energetics 1

Standard Enthalpy Changes of:
Reaction
Formation
Combustion
Neutralisation

Drag and Drop

The enthalpy change,

\Delta H

, is the heat energy change measured at constant pressure and that standard conditions are

and a specified temperature, usually

Drag these tiles and drop them in the correct blank above

100 kPa

298 K

100 Pa

0 K

Drag and Drop

Standard enthalpy change of formation is the enthalpy change measured at standard conditions, when

of a substance is formed from its

in their

Drag these tiles and drop them in the correct blank above

one mole

elements

standarded states

Drag and Drop

Standard enthalpy change of combustion is the enthalpy change measured at standard conditions when

of a substance is

burned in

Drag these tiles and drop them in the correct blank above

one mole

completely

oxygen

incompletely

Drag and Drop

Standard enthalpy change of neutralisation is the enthalpy change measured at standard conditions when

is produced by neutralisation of an acid with an alkali.

Drag these tiles and drop them in the correct blank above

one mole

water

Drag and Drop

Standard enthalpy change of atomization is the. enthalpy change measured at standard conditions when

atoms is formed from an

in its standard state.

Drag these tiles and drop them in the correct blank above

one mole

gaseous

element

Multiple Choice

For which equation is the enthalpy change correctly described as an enthalpy change of formation?

2NO(g) $\rightarrow$ N2(g) + O2 (g)

2CO(g) + O2(g) $\rightarrow$ 2CO2(g)

H2O(l) + NaCl (s) $\rightarrow$ NaCl(aq)

K(s) + Mn(s) +2O2(g) $\rightarrow$ KMnO4(s)

Multiple Choice

Which equation has an. enthalpy change of reaction which corresponds to the standard enthalpy change of atomization of chlorine?

1/2 Cl₂(g) $\rightarrow$ Cl(g)

1/2 Cl₂(l) $\rightarrow$ Cl(g)

Cl₂(g) $\rightarrow$ 2Cl(g)

Cl₂(l) $\rightarrow$ 2Cl(g)

Labelling

Label the following profile for the reaction:

CaCO₃ --> CaO + CO₂

Drag labels to their correct position on the image

Activation Energy

Products

Reactants

ΔH (negative)

ΔH (positive)

CaO + CO₂

CaCO₃

Labelling

Label the following profile for the reaction:

N₂ + 3H₂--> 2NH₃

Drag labels to their correct position on the image

ΔH (negative)

Reactants

Products

2NH₃

N₂ + 3H₂

ΔH (positive)

Activation Energy

Multiple Select

The equation for a reaction is shown.

H₂(g) + 1/2 O₂(g) → H₂O (l) ; ΔH = x kJ mol ^-1

Tick all that are correct.

It represents enthalpy change of formation only.

It represents enthalpy change of formation and combustion.

x is positive

x is negative

Multiple Choice

Which of the following processes is endothermic?

the condensation of steam

the freezing of water

the decomposition of calcium carbonate into calcium oxide and carbon dioxide

the reaction between hydrogen ions and hydroxide ions

Multiple Choice

The enthalpy change for the neutralization reaction below is − 114 kJ mol ^-1.

2NaOH (aq) + H₂SO₄(aq) ----> Na₂SO₄(aq) + 2H₂O(l)

Use this information to suggest the most likely value for the enthalpy change for the following neutralization reaction.

Ba(OH)₂ (aq) + 2HCl(aq) ----> BaCl₂(aq) + 2H₂O(l)

− 57 kJ mol ^-1

− 76 kJ mol ^-1

− 114 kJ mol ^-1

− 228 kJ mol ^-1

Multiple Choice

The enthalpy change for the neutralization reaction below is − 114 kJ mol ^-1.

2NaOH (aq) + H₂SO₄(aq) ----> Na₂SO₄(aq) + 2H₂O(l)

Use this information to suggest the most likely value for the enthalpy change for the following neutralization reaction.

NaOH (aq) + HCl(aq) ----> NaCl(aq) + H₂O(l)

− 57 kJ mol ^-1

− 76 kJ mol ^-1

− 114 kJ mol ^-1

− 228 kJ mol ^-1

Hess Cycles

Key Principle

The energy change for a reaction is the same, irrespective of the route taken, assuming the starting conditions are unaltered

Multiple Choice

-570

-790

-860

-1080

Draw

The enthalpy changes of formation of gaseous ethene and gaseous ethane are +52 kJ mol ^-1and − 85 kJ mol ^-1 respectively at 298 K.

What is the enthalpy change of reaction at 298 K for the following process?

C₂H₄(g) + H₂(g) ---> C₂H₆(g)

Construct a Hess cycle and calculate.

Making an approximation for the enthalpy change of a reaction

Uses:

The heat energy required to break a mole of gaseous bonds homolytically in the gaseous state.

Definition

Bond Enthalpies

Limitations:

-bond enthalpies are averaged for all similar bonds
- energies are all in gaseous state

Drag and Drop

Mean bond enthalpy is the enthalpy change when

of a bond in the

state, averaged out over many

molecules, is

Drag these tiles and drop them in the correct blank above

one mole

gaseous

different

broken

formed

Multiple Choice

Which one of the following statements about an endothermic reaction is correct?

The energy absorbed in bond breaking is greater than the energy released in bond forming

The energy absorbed in bond breaking is less than the energy released in bond forming

The energy released in bond breaking is greater than the energy absorbed in bond forming

The energy released in bond breaking is less than the energy absorbed in bond forming

Drag and Drop

Bond enthalpy is the heat

required to break a

of bonds

in the gaseous state.

Drag these tiles and drop them in the correct blank above

energy

mole

homolytically

heterolytically

typcial

entropy

Multiple Choice

221.5

463.5

588

927

Multiple Choice

-95

-208

-1080

-93

Drag and Drop

The enthalpy of formation of Ammonia is given as -46.1kJ/mol, the last answer (-93kJ/mol) is different for several reasons...

1) The energy change is for

moles of ammonia forming, the enthalpy of

is for

mole forming.

2) The bond enthalpies are

bond enthalpies and not

to ammonia

Drag these tiles and drop them in the correct blank above

two

one

formation

mean

specific

three

hydrogenation

gaseous

vague

Multiple Choice

4.9

6.5

8.7

13.0

Multiple Choice

In an experiment, 1.000 g of a hydrocarbon, A, was burned completely in oxygen to produce 3.143 g of carbon dioxide and 1.284 g of water.

In a different experiment, the molar mass of the hydrocarbon, A, was found to be 84.0 g mol^–1.

A spirit burner was filled with the liquid hydrocarbon, A. The burner was weighed, lit and then used to raise the temperature of a quantity of water in a beaker, as shown in the diagram. The burner was then reweighed.

Calculate the Enthalpy of Combustion - to an appropriate number of significant figures

-2790

-1860

-3650

-8670

Multiple Choice

Using 150ml of water, and 0.717g of methanol the heat transferred to the water was 9860J, calculate the enthalpy of combustion of methanol, include a sign and appropriate number of significant figures

-205

-450

-400

+320

+150

Dropdown

The burner lid increases the

of the experiment by

the amount of pentane

Lattice Enthalpy

Defintion

The change in heat energy when one mole of an ionic lattice is formed from its constituent gaseous ions.

e.g. Na⁺_(g) + Cl^-_(g) --> NaCl_(s)

Multiple Choice

Na⁺ (g) + Cl^- (g) --> NaCl (s)

Ionisation

Combustion

Lattice enthalpy

Atomisation

Multiple Choice

Mg (s) --> Mg (g)

Ionisation

Combustion

Formation

Atomisation

Multiple Choice

Cl (g) + e- --> Cl- (g)

Ionisation

Electron Affinity

Combustion

Formation

Multiple Choice

Mg (g) --> Mg+ (g) + e-

Ionisation

Combustion

Formation

Hydration

Multiple Choice

Na+ (g) + Cl- (g) --> Na+ (aq) + Cl- (aq)

Formation

Solution

Combustion

Hydration

Multiple Choice

½ H2 (g) + ½ Cl2 (g) --> HCl (g)

Formation

Combustion

Atomisation

Ionisation

Multiple Choice

O^- (g) + e- --> O^2- (g)

1st electron affinity

2nd electron affinity

3rd electron affinity

4th electron affinity

Multiple Choice

C (g)+ O2 (g)--> CO2 (g)

Ionisation

Combustion

hydration

solution

Multiple Choice

First electron affinity of an element is usually ________ and second electron affinity is ____________.

exothermic, endothermic.

exothermic, exothermic.

endothermic, endothermic.

endothermic, exothermic.

Multiple Choice

What enthalpy change does the number 4 represent?

Formation

1^st ionisation energy of Na

1^st electron affinity of Na

Atomisation of Na

Multiple Choice

Identify the enthalpy change represented by letter g.

Enthalpy of formation

Lattice Enthalpy

Electron affinity of bromine

Enthalpy of atomisation of zinc

Multiple Choice

Enthalpy change is represented by step y ?

Enthalpy of formation calcium bromide

Enthalpy of atomisation of calcium

1^st electron affinity of bromine

Enthalpy of atomisation of bromine

Energetics
Revision

Show answer

Auto Play

Slide 1 / 46

SLIDE

Similar Resources on Wayground

40 questions

Mixtures, Solutions, and Chemical Equations

Presentation

•

9th - 12th Grade

41 questions

Covalent Bonding

Presentation

•

8th - 12th Grade

44 questions

Introduction to Moles

Presentation

•

9th - 12th Grade

41 questions

Lewis Dot Structures

Presentation

•

9th - 12th Grade

42 questions

Chapter 13 Vocab Review - Thermochemistry

Presentation

•

10th - 12th Grade

41 questions

Arrhenius & Bronsted Lowry Acids & Bases

Presentation

•

9th - 12th Grade

43 questions

4/22 Solutions in Chemistry

Presentation

•

9th - 12th Grade

Popular Resources on Wayground

24 questions

PBIS-HGMS Day 10

Quiz

•

6th - 8th Grade

10 questions

HCS SCI 03 Summer School Review 3

Quiz

•

3rd Grade

11 questions

Home Scope

Quiz

•

7th - 8th Grade

15 questions

HCS SCI 05 Summer School Assessment 3 Review

Quiz

•

5th Grade

35 questions

Lufkin Road Middle School Student Handbook & Policies Assessment

Quiz

•

7th Grade

18 questions

Geo 11.3 Area of Circles and Sectors

Quiz

•

9th - 11th Grade

Discover more resources for Chemistry

18 questions

Geo 11.3 Area of Circles and Sectors

Quiz

•

9th - 11th Grade

Energetics Revision Lesson

EnergeticsRevision

Defintions

Hess Cycles

Bond Enthalpies

Lattice Enthalpy

EnergeticsRevision

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Chemistry

Energetics
Revision

Energetics
Revision