CHEM 11042-Fundamentals of Chemistry Report – Chemistry Assignment Help

Assignment Task

Task 

Question 1: (Week 3 – Topics 8 & 9 of Foundations of Chemistry Study Guide)     
Since iron is more reactive than copper, it displaces the copper ions from the aqueous solution of copper sulphate. This is called a single displacement reaction of one metal by another metal. To experimentally test this, Joel reacted 0.9845 g of iron fillings with an excess ofcopper sulphate solution. When the reaction was complete the solution had changed from blue to green and a copper deposit weighing 1.024 g had formed in the solution. In this reaction, metallic iron is converted into ferrous ion (Fe2+) and cupric ion (Cu2+) is converted into metallic copper. 

a) Calculate the number of moles of iron used and the number of moles of copper formed.
b) Calculate the theoretical mass of copper that was expected to be produced and hence determine the percentage yield of Joel’s experiment.
c) How many molecules of iron are present in 0.9845 g of iron fillings?
    
Fiona prepared a solution by dissolving 1.35 g of silver nitrate in a 250 mLvolumetric flask and diluting it up to the volume. 

d) Calculate the molarity of the silver nitrate solution.
e) What volume of this solution is required to prepare 100 mL of 0.01 M of silver nitrate solution? 

Question 2: (Week 4 – Topics 10 & 11 of Foundations of Chemistry Study Guide) 
Methanol, also known as methyl alcohol, is a toxic alcohol and isbecoming a popular alternative fuel source. Globally, the use of methanol as a fuel now accounts for 10% of all fuel use (about 7 million tonnes per year) but is expected to increase in the future. Methanol can be produced by the reaction of carbon monoxide and hydrogen in the presence of a catalyst. 

a) Writethe balanced equation for this reversible reaction. In your answer, consider the states of matter of the reactants and products and the type of reaction arrow that should be used. 
Suppose that 456 g of carbon monoxide is reacted with 75.0 g of hydrogen in the presence of catalyst.
b) Determine the limiting reactant of the above reaction. Provide full workings and explanations using stoichiometry.
c) Calculate the mass of methanol produced in the reaction? 
d) Calculate the mass of the excess reactant that remains after the reaction.
e) Why is the above reaction considered a reversible reaction? Explain why the reaction is a chemical reaction rather than a physical reaction. 

Question 3: (Week 5 – Topic 12 of Foundations of Chemistry Study Guide)     
a) Write an expression for the equilibrium constant for this reaction.  
2Al(s) + 3MnSO4(aq) ? Al2(SO4)3(aq) + 3Mn(s)

b) At equilibrium, the concentration of the reactants and products for the reaction in (a) above are determined as follows: [MnSO4] = 0.35 M and [Al2(SO4)3] = 0.040 M. What is the value of the equilibrium constant (Kc)? Predict whether the products or reactants will be favoured at equilibrium.

c) Given that the concentrations of the reactants and products for the reaction in (a) above at a particular time are [MnSO4] = 0.111 M and [Al2(SO4)3] = 0.119 M, determine the reaction quotient (Qc). Compare the Kc and Qc values and predict the favoured direction of the reaction.
d) In ultraviolet light, methane reacts with bromine to produce an organic product (bromomethane) and hydrobromic acid, as shown by reaction below. 

Question 4: (Week 6 – Topics 13 & 14 of Foundations of Chemistry Study Guide) 

a) Is ethanoic acid a weak electrolyte or a strong electrolyte, give a reason for your answer.Show the dissociation of ethanoic acid in water. 
b)Given that the hydroxide ion concentration of a solution is [OH-] = 2.1 × 10-4 M, calculate the pH and state whether the solution is acidic, basic or neutral. 
c) What two processes are required for a chemical to become an electrolyte? Explain the two processes with appropriate examples. 
d) Gastric acid plays a key role in the digestion of proteins by activating digestive enzymes and often has a pH value in the range of 1.5 to 3.5.If the pH of the acid at a given time is found to be 1.25, calculate the molarity of the gastric acid juice.
e) Isocyanic acid, also known as Hydrogen cyanate, is a weak acid and a potentially toxic atmospheric pollutant. Write down the equation for the dissociation of isocyanic acid in water. Explain the term conjugate base and state the correct conjugate base of isocyanic acid. Give a reason for your answer. 

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