PHYSICAL SCIENCES CHEMISTRY JULY 2021 ASSESSMENT

Last updated about 1 year ago

50 questions

Note from the author:

2 HOURS  - 100 MARKS
Wherever the question requires you to use the "show your work" feature, you must answer the question on paper. DO NOT COMPLETE THESE QUESTIONS ON FORMATIVE. 
At the end of the assessment you will attach a scanned pdf of your written answers to the assignment in Google classroom.

Instructions

2 HOURS  - 100 MARKS
Wherever the question requires you to use the "show your work" feature, you must answer the question on paper. DO NOT COMPLETE THESE QUESTIONS ON FORMATIVE. 
At the end of the assessment you will attach a scanned pdf of your written answers to the assignment in Google classroom.

PHYSICAL SCIENCES CHEMISTRY JULY 2021 ASSESSMENT

PHYSICAL SCIENCES CHEMISTRY JULY 2021 ASSESSMENT

SECTION A: ORGANIC CHEMISTRY (30 Marks)

Which one of the following will rapidly decolourise bromine water?

Identify the two reactants needed to make ethyl butanoate

Organic reactions

SECTION B: ENERGY, RATES AND EQUILIBRIUM (30 Marks)

X represents the potential energy of the products formed during the reverse reaction

The role of a catalyst in a chemical reaction is to increase the ....

What is the change in enthalpy for the forward reaction in kJ.mol-1? Write only the number, no units.

What is the change in enthalpy for the reverse reaction in kJ.mol-1? Write only the number, no units.

Write a Kc expression for this reaction

Redraw and complete the following rate graph illustrating the effect of reducing the volume of the container on reaction rate as the system adjusts to reach a new equilibrium. Be sure to complete the key. (if you don't have coloured pens then use solid line and dotted line)

Chemical equilibrium 1

Write the balanced chemical equation for the forward reaction

Chemical equilibrium 2

Calculate the equilibrium concentration of the COBr2(g). Show ALL working out.

SECTION C: ACIDS AND BASES (40 Marks)

Consider HSO-4 and select all the statements which apply.

Which one of the following solutions has the highest pH? All of the solutions have a concentration 0,1 mol.dm-3

Order the following Ka values in order from strongest acid to weakest acid:

Calculate the concentration of hydronium ions if originally [H2SO4] = 0,1 mol.dm-3.

pH and Kw

In pure water [H3O+] = [OH-] at any temperature

Titrations

What is the name of the chemical reaction that takes place during a titration?

a) Redraw and complete the following table. b) Calculate the average volume of barium hydroxide used.

SECTION A: ORGANIC CHEMISTRY (30 Marks)

Which one of the following will rapidly decolourise bromine water?

Identify the two reactants needed to make ethyl butanoate

Organic reactions

Identify the functional group of Compound P.

Identify the general type of reaction and the specific type of reaction occuring for A - F

To which homologous series does compound X belong?

Using STRUCTURAL FORMULAE, write down the balanced equation for reaction B.

Write down the IUPAC name of compound X

Write down the molecular formula of the inorganic reactant needed for reaction D

Write down the IUPAC name of compound Z.

Using molecular formulae, write a balanced equation for the complete combustion reaction of compound P

SECTION B: ENERGY, RATES AND EQUILIBRIUM (30 Marks)

X represents the potential energy of the products formed during the reverse reaction

This graph could represent the change in potential energy for the following reaction:

This graph could represent the change in potential energy for the combustion of methane

The role of a catalyst in a chemical reaction is to increase the ....

Is this reaction exothermic or endothermic?

What is the change in enthalpy for the forward reaction in kJ.mol-1? Write only the number, no units.

What is the change in enthalpy for the reverse reaction in kJ.mol-1? Write only the number, no units.

What is the change in enthalpy for the reverse reaction in kJ? Write only the number, no units.

Write a Kc expression for this reaction

More HgO(s) is now added to the container at constant temperature. How will the forward and reverse reaction rates be affected?

Now the volume of the container is decreased. How will the concentration of O2 (g) have changed once the new equilibrium has been reached?

Redraw and complete the following rate graph illustrating the effect of reducing the volume of the container on reaction rate as the system adjusts to reach a new equilibrium. Be sure to complete the key. (if you don't have coloured pens then use solid line and dotted line)

Chemical equilibrium 1

Write the balanced chemical equation for the forward reaction

How do the rates of the forward and reverse reactions compare at the following times?

Chemical equilibrium 2

Calculate the equilibrium concentration of the COBr2(g). Show ALL working out.

Which one of the following correctly describes the Kc value when the equilibrium is reached at a lower temperature?

SECTION C: ACIDS AND BASES (40 Marks)

Consider HSO-4 and select all the statements which apply.

Which one of the following solutions has the highest pH? All of the solutions have a concentration 0,1 mol.dm-3

Order the following Ka values in order from strongest acid to weakest acid:

What is the concentration of hydronium ions?

What is the concentration of hydroxide ions?

What is the pH?

Describe sulphuric acid as strong/weak acid/base

Calculate the concentration of hydronium ions if originally [H2SO4] = 0,1 mol.dm-3.

Hence, calculate the concentration of hydroxide ions at equilibrium.

What will happen to the pH if concentrated NaOH is added?

What will happen to the pH if water is added?

pH and Kw

In pure water [H3O+] = [OH-] at any temperature

At 98 º C, the Kw for water will likely be:

The pH of pure water at 18 ºC is closer to:

How will Kw be affected if a few drops of KOH is added?

Titrations

What is the name of the chemical reaction that takes place during a titration?

Write a balanced chemical equation for this reaction

Which solution is the standard solution?

Identify glassware A

a) Redraw and complete the following table.
b) Calculate the average volume of barium hydroxide used.

a) Redraw and complete the following table.
b) Calculate the average volume of barium hydroxide used.