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1

When there is no wind, the scent of flowers can be detected more easily on a warm evening than on a cold evening. This is because the molecules of the scent ……1…… ……2…… than in colder conditions. Which words correctly complete gaps 1 and 2?

10. Chemistry of the environment  →  10.3. Air quality and climate

1. States of matter  →  1.2. Diffusion

8. The Periodic Table  →  8.1. Arrangement of elements

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2

A student investigates if, at 30 oC, the concentration of acid affects how rapidly it reacts with a known mass of magnesium. The student has a beaker, concentrated acid, water and the apparatus below. P a balance Q a clock R a measuring cylinder S a thermometer Which of these pieces of apparatus does the student use?

12. Experimental techniques and chemical analysis  →  12.1. Experimental design

9. Metals  →  9.4. Reactivity series

12. Experimental techniques and chemical analysis  →  12.5. Identification of ions and gases

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3

The boiling point of liquid X is lower than that of water. To test a student, a teacher covers up the numbers on a thermometer. The student places the thermometer in boiling liquid X. The diagram represents part of the stem of this thermometer. mercury What could the temperature on the thermometer be?

10. Chemistry of the environment  →  10.1. Water

1. States of matter  →  1.1. Solids, liquids and gases

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4

Which mixture can be separated by adding water, stirring and filtering?

12. Experimental techniques and chemical analysis  →  12.4. Separation and purification

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5

An atom has the symbol X p q . Which value determines the position of the element in the Periodic Table?

8. The Periodic Table  →  8.1. Arrangement of elements

2. Atoms, elements and compounds  →  2.2. Atomic structure and the Periodic Table

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6

Element Y is in the second Period of the Periodic Table. An atom of element Z has six more protons than an atom of element Y. Which statement must be correct?

8. The Periodic Table  →  8.1. Arrangement of elements

2. Atoms, elements and compounds  →  2.2. Atomic structure and the Periodic Table

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7

The diagram shows the structure of methane. H H H H C What is the total number of electrons used for bonding in this molecule?

2. Atoms, elements and compounds  →  2.5. Simple molecules and covalent bonds

2. Atoms, elements and compounds  →  2.2. Atomic structure and the Periodic Table

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8

The diagram shows the structure of a substance. What is represented?

2. Atoms, elements and compounds  →  2.6. Giant covalent structures

11. Organic chemistry  →  11.8. Polymers

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9

In the diagrams, circles of different sizes represent atoms of different elements. Which diagram can represent hydrogen chloride gas?

8. The Periodic Table  →  8.1. Arrangement of elements

8. The Periodic Table  →  8.4. Transition elements

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10

Boron, B, forms an oxide. Which equation is correctly balanced?

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11

Students are asked to state • the number of atoms in one molecule of ethanoic acid, • the relative molecular mass, Mr, of this acid. Which line is correct?

3. Stoichiometry  →  3.2. Relative masses of atoms and molecules

3. Stoichiometry  →  3.3. The mole and the Avogadro constant

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12

A molten compound is electrolysed. Two atoms of X are deposited at the negative electrode at the same time as three atoms of Y are deposited at the positive electrode. These results show that: X is a …1…; Y is a …2…; the formula of the compound is …3… . How are gaps 1, 2 and 3 correctly completed?

4. Electrochemistry  →  4.1. Electrolysis

8. The Periodic Table  →  8.1. Arrangement of elements

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13

In which electrolyses are chlorine, hydrogen and sodium hydroxide all produced?

4. Electrochemistry  →  4.1. Electrolysis

12. Experimental techniques and chemical analysis  →  12.5. Identification of ions and gases

7. Acids, bases and salts  →  7.3. Preparation of salts

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14

The diagram shows a match. By striking the match, a chemical reaction takes place. Which statements about the chemical reaction are correct?

5. Chemical energetics  →  5.1. Exothermic and endothermic reactions

6. Chemical reactions  →  6.2. Rate of reaction

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15

Which process is not exothermic?

5. Chemical energetics  →  5.1. Exothermic and endothermic reactions

6. Chemical reactions  →  6.3. Reversible reactions and equilibrium

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16

Three reactions used in the manufacture of sulphuric acid are shown...

6. Chemical reactions  →  6.4. Redox

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17

In an experiment using dilute acid and a metal, the speed at which hydrogen is released is measured (curve X on graph). The experiment is repeated but with one of the conditions changed (curve Y on graph). Y X total volume of hydrogen time Which changes in condition could result in curve Y?

6. Chemical reactions  →  6.2. Rate of reaction

1. States of matter  →  1.1. Solids, liquids and gases

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18

Aqueous sodium hydroxide and aqueous ammonia each give a white precipitate when added to aqueous zinc sulphate. What happens when an excess of each of these reagents is added?

12. Experimental techniques and chemical analysis  →  12.5. Identification of ions and gases

7. Acids, bases and salts  →  7.3. Preparation of salts

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19

Aqueous sodium hydroxide is added to two different solutions with the results shown...

12. Experimental techniques and chemical analysis  →  12.5. Identification of ions and gases

9. Metals  →  9.4. Reactivity series

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20

In which experiment does the limewater not turn milky?

12. Experimental techniques and chemical analysis  →  12.5. Identification of ions and gases

12. Experimental techniques and chemical analysis  →  12.1. Experimental design

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21

Two indicators, bromophenol blue and Congo red, show the following colours in acidic solutions and in alkaline solutions. indicator acid alkali bromophenol blue yellow blue Congo red violet red A few drops of each indicator are added to separate samples of a solution of pH 2. What are the colours of the indicators in this solution?

7. Acids, bases and salts  →  7.1. The characteristic properties of acids and bases

8. The Periodic Table  →  8.3. Group VII properties

12. Experimental techniques and chemical analysis  →  12.2. Acid-base titrations

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22

Aqueous lead(nitrate is added to a solution containing iodide ions. Lead(iodide is formed. Which type of reaction takes place?

4. Electrochemistry  →  4.1. Electrolysis

6. Chemical reactions  →  6.4. Redox

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23

The diagram shows an outline of part of the Periodic Table. W Y X Z Which two elements could form a covalent compound?

2. Atoms, elements and compounds  →  2.5. Simple molecules and covalent bonds

8. The Periodic Table  →  8.1. Arrangement of elements

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24

Which substances react with aqueous potassium bromide to form bromine?

8. The Periodic Table  →  8.3. Group VII properties

11. Organic chemistry  →  11.5. Alkenes

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25

Why are some weather balloons filled with helium rather than hydrogen?

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26

The table shows the densities of some Group I metals. Which of these metals sinks in benzene (density = 0.88 g / cm3) but floats in nitrobenzene (density = 1.2 g / cm3)?

8. The Periodic Table  →  8.2. Group I properties

8. The Periodic Table  →  8.3. Group VII properties

8. The Periodic Table  →  8.1. Arrangement of elements

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27

The diagram shows the properties of four substances. Which one could be magnesium?

9. Metals  →  9.4. Reactivity series

9. Metals  →  9.1. Properties of metals

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28

In ‘native’ copper, the element occurs as the metal, not as a compound. Gold is below copper in the reactivity series. Which can be deduced about the properties of gold?

9. Metals  →  9.4. Reactivity series

9. Metals  →  9.1. Properties of metals

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29

The diagram shows a method for displacing a metal from its oxide. hydrogen metal oxide heat excess of hydrogen burning Which metal can be displaced from its oxide by using this method?

9. Metals  →  9.4. Reactivity series

9. Metals  →  9.6. Extraction of metals

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30

Stainless steel is used to make cutlery. Aluminium is used to make food containers. Which property do both metals have that makes them suitable for these uses?

9. Metals  →  9.3. Alloys and their properties

9. Metals  →  9.2. Uses of metals

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31

Which process takes place in the conversion of iron into steel?

9. Metals  →  9.6. Extraction of metals

9. Metals  →  9.5. Corrosion of metals

6. Chemical reactions  →  6.3. Reversible reactions and equilibrium

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32

In which industrial process is the presence of water not essential?

11. Organic chemistry  →  11.6. Alcohols

10. Chemistry of the environment  →  10.1. Water

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33

The pie chart represents the composition of air. X What is gas X?

10. Chemistry of the environment  →  10.3. Air quality and climate

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34

The diagram shows an experiment in which ammonia is released. heat ammonia mixture of solution X and aqueous ammonium sulphate damp litmus paper Which line in the table is correct?

12. Experimental techniques and chemical analysis  →  12.5. Identification of ions and gases

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35

A bag of fertiliser ‘Watch it grow’ contains ammonium sulphate and potassium sulphate. Which of the three elements N, P and K does ‘Watch it grow’ contain?

10. Chemistry of the environment  →  10.2. Fertilisers

7. Acids, bases and salts  →  7.3. Preparation of salts

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36

When limestone is heated very strongly in air, lime is made. What is the formula of limestone and of lime?

7. Acids, bases and salts  →  7.1. The characteristic properties of acids and bases

3. Stoichiometry  →  3.1. Formulae

12. Experimental techniques and chemical analysis  →  12.5. Identification of ions and gases

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37

Bromine and steam each react with ethene. Which of these reactions need a catalyst?

11. Organic chemistry  →  11.5. Alkenes

11. Organic chemistry  →  11.6. Alcohols

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38

What are formed when glucose is fermented?

11. Organic chemistry  →  11.6. Alcohols

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39

Which formula represents a compound that dissolves in water to form an acidic solution?

7. Acids, bases and salts  →  7.1. The characteristic properties of acids and bases

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40

Butane reacts as shown...

11. Organic chemistry  →  11.5. Alkenes

11. Organic chemistry  →  11.6. Alcohols

6. Chemical reactions  →  6.2. Rate of reaction

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