Q1. The diagrams show some pieces of apparatus used in the lab. .(a) Choose from the letters A, B, C, D, E and F to identify the apparatus in the tablebelow.

Name of the apparatusLetters

Balance

Measuring cylinder

Beaker

Thermometer

Test tube

(Total Marks 5)

Q2. Complete the given table (5)

Reactants Products

CH4 + Cl2 .+ HCl

...............................+ Cl2

CH2 Cl2 + HCl

CH2 Cl2 +

CH Cl3 +

CH Cl3 + Cl2

+ HCl

(Total Marks 5)

Q3.(a) Complete the given word equation and chemical equation

(i) Word Equation :

Magnesium + Zinc Oxide .+ (1)

(ii) Chemical Equation:

(2)

(b) The reaction between Zinc and copper(II) Sulphate is a displacement reaction.

Zn(s) + CuSO4(aq) ZnSO4(aq) + Cu(s)

(i)Define the term displacement reaction

(1)

(ii) From the above given reaction write the colour change of

Solid fromto..

Solution fromto (4)

(c) Consider a redox reaction between calcium and Magnesium Oxide. The chemical equation for this reaction is

MgO + Ca CaO + Mg

(i) Name the substance oxidized in terms of oxygen

(1)

(ii) What is meant by redox reaction

.(1)

(iii) Write an ionic equation for the above reaction

(2)

(d ) Observe the given ionic equation and answer the following questions Cl2 + 2Br - 2 Cl - + Br2

(i) Name the substance that is reduced

(1)

(ii) Name the reducing agent

(1)

(Total Marks 14)

Q4. The table shows the structures of six organic compounds, A to F.

(a) The letter of the compound in the table that is not shown as a displayed formula is ................................................................................................................................................(1).

(b) (i) State what is meant by the term hydrocarbon, and give the letter of one compound in the table that is not a hydrocarbon Hydrocarbon .........................................................................................................................................................

...................................................................................................................................................(2).Letter ...................................................................................................................................................(1).

(ii) State what is meant by the term unsaturated, and give the letter of one compound in the table that is unsaturated.

Unsaturated .........................................................................................................................................................

....................................................................................................................................................(2)Letter ...................................................................................................................................................(1).

(iii) State what is meant by the term isomers, and give the letters of two compounds in the table that are isomers of each other.

Isomers ........................................................................................................................................................

...................................................................................................................................................(2).Letters ...................................................... and ....................................................................... (2)

(c) Some of the compounds in the table are members of the same homologous series.(i) One feature of a homologous series is that adjacent members have formulae that differ by CH2

State two other features of members of the same homologous series.

1......................................................................................................................................................

.........................................................................................................................................................2.......................................................................................................................................................

...................................................................................................................................................(2).(ii) Give the letters of two adjacent members of the same homologous series shown in the table.

Letters ........................................... and .................................................................................. .(2)

(iii) Name the compound A

(1)

(iv) Write the molecular formula of compound C

..(1)

(v) Write the structural formula of compound E

..(1)

(Total Marks 18)

Q5.(a) Carbon monoxide and hydrogen are used in the manufacture of methanol (CH3OH).The reaction is reversible and its an exothermic reaction CO(g) + 2H2(g) CH3OH(g) H = 91 kJ/mol

The reaction is carried out at a pressure of about 100 atmospheres and a temperatureof 250 C.

(i) What do you mean by the term Exothermic reaction

.(1)

(b) Methanol (CH3OH) can be converted into methanal (H2CO).

A mixture of methanol and oxygen is passed over an iron oxide catalyst at 250C.

Methanol and water are the only two products.

(i)What is meant by the term catalyst?

....(2)

(ii)Explain how a catalyst works.

....

..

.

.

(4)

(iii)Draw the energy level diagram for the above reaction showing the activation energyFor exothermic reaction (2)

(iv)Draw an energy level diagram showing activation energy for exothermic reaction using catalyst (2)

(Total Marks 11 )

Q6. (a)The order of reactivity of three metals are Most reactive

Zinc Iron Tin

Least reactive Iron objects can be prevented from rusting by coating them with Zinc or tin.Some of these objects may be scratched when used, so the coating may come off.(i)Use the order of reactivity of the metals to suggest why coating these objects with Zinc is more effective than coating them with tin... .(3). (ii) Name the above process of coating iron with zinc (1)

(b) Some students followed these instructions to investigate how changing the temperature alters the rate of rusting. Weigh an empty watch glass Place some iron fillings on the watch glass Reweigh the watch glass with iron filings Set up the apparatus as shown in the diagram Leave the apparatus at a known temperature After three weeks reweigh the watch glass with its contents Repeat each step at different temperatures

(i) Three of the students described their results as follows

Student-A Temperature in fridge was 6 C , in this run the empty watch glass weighed 20.23 , it weighed 29.34 g with the iron fillings and at the end it weighed 20.42 g. Student B The one that I left in a warm room weighed 30.76 g at the end, the empty watch glass was 21.12 g and with the iron it weighed 30.52 g. The temperature of the room was 27 C Student C I used an oven to heat the last one. The watch glass with iron went up from 28.34 g to 28.84 g. The temperature of the oven was 60 C and the empty watch glass weighed 17.24 g

Complete the following table by entering the data obtained by the students. (5)

TemperatureMass of empty Watch glassMass of watch glass with iron filings at start of experimentMass of watch glass with iron filings at the end of the experimentChange in mass

(ii)Define the term Rusting...(1) (iii)Which of the student iron filings rusted the most (1) Reason.(2)(iv)Which of the student result is the most least reliable (1) Reason.. (2)(v)Write the chemical formula of the hydrated iron (iii) oxide (1)(vi)State any one method of prevention of rusting of iron materialsl and explain the process of itMethod(1)Explanation....(3)

(vii)Name any two things needed for the iron to rust.and..(2)

(Total Marks 23)

Q7. The diagrams shows the displayed formula of five hydrocarbons A, B, C ,D and E

Give the letter of a hydrocarbon to answer these questionsYou may use each letter once, more than once or not at all.(i)Which hydrocarbon is the main component of natural gas ?.(1) (ii)Which hydrocarbon can undergo an addition reaction with hydrogen to form B?(1)(iii)Give the molecular and structural formula of EMolecular formula. .(1)Structural formula. .(1)(b)Hydrocarbons A,B, D and E all belong to the same homologous series.(i) Give the name and general formula of this homologous seriesName (1)General formula(1) (c ) Two reactions that can occur when hydrocarbon A is burned in air are represented by these equations.Equation for reaction 1 CH4 + 2O2 CO2 + 2H2OEquation for reaction 2 CH4 + 1 O2 CO + 2H2O(i)Explain why a different product is formed in reaction 2 and why that product is dangerous (3)(ii)Compound A,B,D and E are alkanes.Explain why the melting and boiling point of alkanes increases down the homologous series..(3)

(iii)Compound C is an unsaturated hydrocarbon.How can we test the given compound is a unsaturated hydrocarbonTest : (1)

Result .(2)

(iv)Chemical equation for the above reaction...(2)

(v)Displayed formula of the product formed (2)

(Total Marks 19)Q.8 A group of students investigated the reaction between marble chips (calcium carbonate) and dilute hydrochloric acid.

The equation for this reaction is CaCO3 + 2HCl CaCl2 + H2O + CO2They wanted to find the effect of changing the concentration of hydrochloric acid on the rate of reaction. The teacher provided a solution that she had labelled 100% hydrochloric acid.The teacher told them to do all their experiments

using different concentrations of hydrochloric acid made by diluting the 100% hydrochloric acid by timing how long it took to collect carbon dioxide at room temperatureThe students used this apparatus.

(a) The students tried to keep the amount of calcium carbonate constant by using the same number of marble chips in each experiment.

(i)State two other properties of the marble chips that should be the same in each experiment.

1.......................................................................................................................................................2.............................................................................................................................................. (2).

(b)The students repeated the experiment to make sure that it was a fair test. They used a different supply of hydrochloric acid. They all measured the time to collect 100 cm3 of carbondioxide and calculated the rate of each reaction.

Their results are shown in the table.

(i) Plot these results on the grid and draw a straight line of best fit. (3)(ii) One of the points is anomalous. Circle this point on the graph. (1)

(iii) Suggest two errors in the experiment that could have caused this anomalous result.

1.......................................................................................................................................................

.........................................................................................................................................................

2.......................................................................................................................................................

.................................................................................................................................................. .(2)

(iv) Use your graph to estimate the rate of reaction using an acid concentration of 46%.

Show on your graph how you obtained your answer. (2)

.............................................................................................................................................. (c) Some students investigated the rate of the reaction between marble chips (calcium carbonate) and dilute hydrochloric acid. The equation for the reaction is

CaCO3 (..........) + 2HCl (..........) CaCl2 (..........) + H2O (..........) + CO2 (..........)

(i)Insert state symbols after each formula. (2)

One of the students used this apparatus.

(ii)What is the purpose of the cotton wool and how would this improve the accuracy of the result?

...(3)

He recorded the total mass of the conical flask and contents every 30 seconds for several minutes.

(iii)Why does the mass of the flask and contents decreases during this experiment?

.. (3)

He plotted the resultsas a graph of total mass (y-axis) against time.

(iv)Which of the graphs could represent his results?Put a cross () in a box to indicate your answer. (1)

(c) Another student carried out three experiments to investigate the effect of changing the concentration and temperature ofhydrochloric acid on the rate of reaction.

She kept the number and size of marble chips the same in each experiment.The marble chips were in excess.In each In each experiment she measured the volume of gas collected at different times, using this apparatus.

The graph shows the results of her experiments

Experiments A and B represent experiments using the same concentration of hydrochloric acid but at different temperatures.

(i) Which letter represents the experiment at the higher temperature?

Give a reason for your choice.

Letter .................................................................................................................................................. (1)Reason .........................................................................................................................................................

........................................................................................................................................................

(2)Experiments B and C represent experiments at the same temperatures and using the same volumes of hydrochloric acid.The concentration of hydrochloric acid used in experiment B is 0.20 mol/dm3.

(ii)What is the concentration of hydrochloric acid used in experiment C?Explain how you worked out your answer.

Concentration .................................................................................................................................................(1).Explanation .........................................................................................................................................................

.......................................................................................................................................................

(2)

(Total Marks 25)

13