Name:……………( ) 2013 T3W1 Test(Word Equations, separating mixtures) Date:…...Section A : Multiple Choice Question (5 marks)Circle the most appropriate answer to each of the respective questions on page 3

1. Which statement about the change in properties of the elements from left to right across a Period is incorrect?

A The number of protons in an atom increases.B The elements changes from being metals to being non-metals.C The number of valence electrons decreases across the period.D The number of electron shell remains the same and is the same as the period number.

2. A liquid ester is used to flavour food. Which test could be used to show that the liquid ester is pure?A When it evaporates, it leaves no residue.B When distilled, it gives two fractions.C It boils over the range 60oC to 80oC.D It freezes at exactly 45oC.

3. The graph below shows the solubility of different substances in 100 g of water at different temperature.

Which of the following statements is correct?A The higher the temperature, the solubility of all solutes in the same amount of water

increases.B The lower the temperature, the solubility of ammonia gas (NH3) in water increases.C At 40 oC, less ammonium chloride (NH4Cl) can dissolve in 100 g of water than

ammonia gas.D At 100oC, 20 g of common table salt (NaCl) will dissolved in 100 g of water to form a

saturated solution.

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4. An alloy is a mixture of a transition metal with either a metallic or a non-metallic element. Which constituent of the alloy is incorrect?

Alloy Main constituents of the alloyA Brass copper and zincB Bronze copper and tinC Duraluminium aluminium , magnesium and copperD Steel iron and sulfur

5. The apparatus below was used to separate a miscible liquid mixture. The boiling points of the two liquids were 78oC and 100 oC. Which graph would be obtained if the temperature at point T was plotted against the total volume of distillate obtained?

A Temperature/oC

Total volume of liquid distilled/cm3

B Temperature/oC

Total volume of liquid distilled/cm3

C Temperature/oC

Total volume of liquid distilled/cm3

D Temperature/oC

Total volume of liquid distilled/cm3

T

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Answers to Section A: Circle the most appropriate answer for each question.

1. A B C D

2. A B C D

3. A B C D

4. A B C D

5. A B C D

Structured Question (15 marks)Answer all questions in the spaces provided.

1. The Periodic Table below shows some elements. The code letters do not represent the atomic symbols of the elements.

A D

E G J L M

Q R T

X Z

Use the above code letters to answer the questions that follow:

(a) Q is a soft metal that reacts vigorously with cold water to produce hydrogen gas and an alkaline solution. Predict, giving reason, the letter that represent the element that has similar chemical properties as element Q.

[2]

(b) State the code letter of an element, found in Period 1 that exists as a monatomic gas.

[1] 47 – 17 = 30g will crystallise out and remain as precipitate.

(c) Give the Group number and Period number of the element that exist as a diatomic molecule at room temperature and will relight a glowing splint.

[1]

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2. Write the word equation including state symbols for the following reactions.a) White silver chloride will be precipitated in sodium nitrate solution when sodium

chloride solution reacts with silver nitrate solution.

[2]

b) Antacid tablets that contains magnesium hydroxide is used to neutralise excess hydrochloric acid in the stomach to produce neutral magnesium chloride solution and water

[2]

3. A mixture of two solids can be separated according to the nature of the solids. Refer to the table below and complete by writing the procedure of obtaining the solid from the mixture X and statethe name of a suitable solid in mixture Y .

Mixture Solid 1 Solid 2

Procedure to recover the components

Solid 1 Solid 2

X TableSalt

Chalk powder

Chalk powder which is insoluble in water, will be collected as residue on the filter paper after filtration

[2]

Y sand Heat the mixture and solid 1 will sublime and then deposit as solid on the inverted filter funnel

Sand is left on the evaporating dish

[1]

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4. Chromatography is used to test for the presence of drugs in urine sample.A concentrated sample of urine is spotted onto chromatography paper on the start line. Alongside this, known drugs are spotted. The chromatogram is run using methanol as the solvent. When finished, the paper is read by placing under ultra-violet light.A chromatogram of four urine samples from four runners A to D is shown.

a) Calculate the Rf value for caffeine.[1]

b) From the results, the urine sample from one runner contains a drug.State which runner, and name the drug present.

[2]

d) Explain why ultra-violet light was used to read the chromatogram.

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[1]

~~END OF CHEMISTRY PAPER~~

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