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Which row describes what happens to the particles in solid iodine when it is heated and turned into a gas? [Table_1]
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A student put exactly 25.00 cm$^3$ of dilute hydrochloric acid into a conical flask. The student added 2.5 g of solid sodium carbonate and measured the change in temperature of the mixture. Which apparatus does the student need to use?
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A student separates sugar from pieces of broken glass by dissolving the sugar in water and filtering off the broken glass.
What is the filtrate?
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543
How many protons, neutrons and electrons are there in one atom of the isotope $^{27}_{13} ext{Al}$? [Table_1]
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567
Rubidium is in Group I and iodine is in Group VII of the Periodic Table. Which row describes what happens when rubidium and iodine react together to form rubidium iodide?
[Table_1]
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Which row shows the properties for an ionic compound? [Table_1]
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532
Which substance is described as a macromolecule?
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The formula of sodium chlorate(V) is $\text{NaClO}_3$. What is the relative formula mass of sodium chlorate(V), $\text{NaClO}_3$?
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Iron can be electroplated with zinc to make it resistant to corrosion.
Which row about electroplating iron with zinc is correct?
[Table]
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An energy level diagram for the reaction between substance X and substance Y to form substance Z is shown. Which statement is correct?
511
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Which reactions are exothermic?
1. $C + O_2 \rightarrow CO_2$
2. $CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O$
3. $2H_2 + O_2 \rightarrow 2H_2O$
500
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Solid copper(II) carbonate reacts with dilute sulfuric acid.
$$\text{CuCO}_3 + \text{H}_2\text{SO}_4 \rightarrow \text{CuSO}_4 + \text{CO}_2 + \text{H}_2\text{O}$$
The rate of the reaction can be changed by varying the conditions.
Which changes always increase the rate of this chemical reaction?
1. increasing the concentration of sulfuric acid
2. increasing the size of the pieces of copper(II) carbonate
3. increasing the temperature
4. increasing the volume of sulfuric acid
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When a piece of marble is added to hydrochloric acid, bubbles of carbon dioxide gas are given off. Which method is used to find the rate of the reaction?
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Solid X is heated strongly.
The colour of the solid changes from blue to white.
What is solid X?
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What happens to a chemical substance when it is reduced?
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Which statements about acids and bases are correct?
1. An acid reacts with a metal to give off hydrogen.
2. A base reacts with an ammonium salt to give off ammonia.
3. An acid reacts with a carbonate to give off carbon dioxide.
4. Alkaline solutions are orange in methyl orange.
599
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Oxide 1 is a solid that reacts with dilute hydrochloric acid.
Oxide 2 is a gas that reacts with sodium hydroxide solution.
What are the formulae of the oxides?
[Table_1]
539
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555
In the preparation of zinc sulfate crystals, excess zinc oxide is added to dilute sulfuric acid. Why is an excess of zinc oxide added?
525
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584
Which statement about aqueous sodium hydroxide is correct?
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583
A period of the Periodic Table is shown.
[Table_1]
The letters are not their chemical symbols.
Which statement is correct?
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Which statement about the elements in Group VII of the Periodic Table is correct?
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554
Part of the Periodic Table is shown.
Which element is a transition element?
533
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507
The noble gases are in Group VIII of the Periodic Table.
Which statement explains why noble gases are unreactive?
538
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575
Which statement is correct for all metals?
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502
Which row describes the method of extraction of aluminium and iron from their ores?
[Table_1]
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534
Which statement about metals and their uses is correct?
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The diagrams show some uses of water in the home.
[Image of methods 1, 2, and 3]
For which uses is it important for the water to have been treated?
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Four different test-tubes containing water and an iron nail are left for two weeks.
Which nail showed the least amount of rusting?
[Image_0: Image showing four test tubes labeled A to D with different water treatments.]
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Which process does not produce a greenhouse gas?
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Sulfur burns to make sulfur dioxide.
Which row describes a source of sulfur and a use of sulfur dioxide?
[Table_1]
524
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Lime (calcium oxide) is used to treat waste water from a factory.
Which substance is removed by the lime?
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584
A chemical equation for the complete combustion of methane is shown.
$2CH_4 + zO_2 \rightarrow 2CO_2 + 4H_2O$
What is the value of $z$?
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Fuel X produces carbon dioxide and water when it is burned in air. So does fuel Y. What could X and Y be? [Table_1]
559
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526
Which compound belongs to a different homologous series to the others?
540
559
598
What is a property of aqueous ethanoic acid?
576
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Which statements about unsaturated hydrocarbons are correct?
1. They contain both single and double bonds.
2. They turn aqueous bromine from colourless to brown.
3. They can be manufactured by cracking.
597
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524
Which substance is used to produce alcohol by fermentation?
551
513
572
Which statements are correct?
1. Polymers are large molecules built up from monomers.
2. Proteins are natural polymers.
3. Proteins and carbohydrates are constituents of food.
540
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545
