greenwich literacy and numeracy centre1Chemical and Metal Reactions exam question booklet levels 5-7 (2006-2007)Level 51.An alloy is a mixture of elements.The table shows the mass of each element present in 100 g of five different alloys, bronze, solder, steel, stainless steel and brass.

mass of each element in 100 g of alloyalloylead(g)tin(g)copper(g)zinc(g)carbon(g)iron(g)chromium(g)nickel(g)bronze

4951

solder6238

steel

199

stainless steel

702010brass

6733

(a)Which alloy in the table above contains an element which is a non-metal?.............................................................1 mark(b)Which two alloys in the table contain only two metals?........................................................ and .........................................................1 mark(c)Another alloy called nichrome contains only the elements chromium and nickel. 100 g of nichrome contains 20 g of chromium.How much nickel does it contain? g1 mark(d)Before 1992, two-pence coins were made of bronze.Steel rusts but bronze does not rust.(i)Why does bronze not rust?Use information in the table above to help you...............................................................................................................................................................................................................................1 mark

(ii)Rusting requires water and a gas from the air.Give the name of this gas..............................................................1 markmaximum 5 marksLevel 62.Shuli investigated differences between physical and chemical changes.She put three chemicals in separate crucibles and weighed each one. She heated each crucible as shown below. She weighed each crucible again when it had cooled down.

She recorded her observations in a table as shown below.experimentname of chemicalobservationschange in mass Amagnesium (a silvery solid)The silvery magnesium burned brightly in air.A white powder was formed.increaseBpotassium permanganate(purple crystals)The purple crystals crackled and turned black.A colourless gas was given off.decreaseCzinc oxide(a white powder)The white powder turned pale yellow on heating.It turned white again on cooling.no change

(a)(i)In experiment A, magnesium reacts with a gas in the air.Complete the word equation for the reaction in experiment A.magnesium + ..................................... ...................................................2 marks(ii)Explain the increase in mass in experiment A. Use your word equation to help you...........................................................................................................................................................................................................................1 mark(b)The gas given off in experiment B re-lit a glowing splint.Give the name of this gas. ................................................................1 mark(c)Name the white powder left at the end of experiment C...................................................................1 mark (d)In each experiment, did a chemical change or a physical change take place?Tick one box for each experiment.experimentchemical changephysical changeA

B

C

1 markMaximum 6 marks

Level 63.A science teacher showed her class three experiments, A, B and C.The experiments and the word equations for the reactions that took place are shown below.All the experiments were done in a fume cupboard.

(a)From the substances in experiments A, B and C, above, give the name of:(i)one metallic element;.............................................................1 mark

(ii)one non-metallic element;.............................................................1 mark(iii)two compounds.................................................... and ...................................................1 mark(b)In experiment B, the iron filings weighed 2.0 g at the beginning of the experiment and the iron sulphide produced weighed 2.8 g.Explain this increase in mass...................................................................................................................................................................................................................................................1 mark(c)Complete the word equation for the chemical reaction in experiment C.copper + chlorine .............................................................1 markmaximum 5 marksLevel 74.(a)Sasha placed small samples of four different metals on a spotting tile.She added drops of calcium nitrate solution to each metal.

Sasha repeated the experiment with:fresh samples of the four metals and copper nitrate solutionfresh samples of the four metals and iron nitrate solution.Will a reaction take place when each of the metals is added to each ofthe solutions?Use the reactivity series below to help you.most reactivecalciummagnesiumaluminiumzincironleadleast reactivecopper

In the table below:place a tick, , to show that a reaction took placeplace a cross, X, to show that no reaction took place.Two have been done for you.

salt solutionmetal

copperironmagnesiumzinccalcium nitrate

copper nitrateX

iron nitrate

X

3 marks(b)Three pairs of chemicals are listed below.A reaction only takes place with two of the pairs.Draw a line from each reaction to the correct result.Draw only three lines.pair of chemicalsresultcalcium carbonate + hydrochloric acid

no reaction

magnesium + hydrochloric acid

a chloride, carbon dioxide and water are formed

copper + hydrochloric acid

a chloride and hydrogenare formed2 marksmaximum 5 marks

Level 75.(a)The diagrams below show the arrangement of atoms or molecules in five different substances A, B, C, D and E.Each of the circles , and represents an atom of a different element.

Give the letter of the diagram which represents:(i)a mixture of gases;..............1 mark(ii)a single compound...............1 mark(b)The diagram below shows a model of a chemical reaction between two substances.

(i)How can you tell from the diagram that a chemical reaction took place between substance P and substance Q?..........................................................................................................................................................................................................................1 mark

(ii)Substance P is carbon.Suggest what substances Q and R could be.substance Q .......................................................................................substance R .......................................................................................1 mark(iii)How does the diagram show that mass has been conserved in this reaction?..........................................................................................................................................................................................................................1 markmaximum 5 marks