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The arrangements of particles in solids, liquids and gases are different.
Which statement about the molecules in ice, water or steam is correct?
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The melting points and boiling points of three elements, at 1 atm pressure, are shown. [Table_1: Melting and boiling points of argon, nitrogen, and oxygen] Separate samples of argon, nitrogen, and oxygen are stored at −200°C and at 1 atm pressure. How many samples are liquids?
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Which statement describes a compound?
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Which statement about elements in the Periodic Table is correct?
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Which statement about ions and ionic bonds is correct?
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Which molecule has only two shared pairs of electrons?
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Which statement about graphite explains why it is used as an electrode?
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Methane, CH₄, burns in air to form carbon dioxide and water. What is the balanced equation for this reaction?
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Magnesium reacts with steam.
$$ \text{Mg} + \text{H}_2\text{O} \rightarrow \text{MgO} + \text{H}_2 $$
When 2.43g of magnesium reacts with an excess of steam, the products are 4.03g of magnesium oxide and 0.20g of hydrogen. What is produced when 7.29g of magnesium reacts with an excess of steam?
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The diagram shows an electrolysis circuit. At which electrode is hydrogen formed?
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Which gases are used to generate electricity in a fuel cell?
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The reaction pathway diagram for a reaction is shown.
Which statements about the reaction are correct?
1 The reaction is endothermic.
2 The reaction is exothermic.
3 The diagram represents the combustion of methane.
4 The diagram represents the thermal decomposition of limestone.
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Which row describes a chemical change? [Table_1]
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Magnesium powder reacts with an excess of dilute hydrochloric acid to produce hydrogen gas. Which statements about this reaction are correct?
1. The smaller the particles of magnesium powder, the more slowly the hydrogen is produced.
2. The higher the temperature, the faster the magnesium powder disappears.
3. The lower the concentration of dilute hydrochloric acid, the faster the rate of reaction.
4. The faster the magnesium powder disappears, the faster the rate of reaction.
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Which statement about hydrated cobalt(II) chloride is correct?
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An aqueous solution reacts with a solid. The products are an alkaline gas, a salt and water. What are the aqueous solution and the solid?
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Both calcium oxide, CaO, and calcium hydroxide, Ca(OH)_2, are used to remove sulfur dioxide, SO_2, from flue gases in industrial plants.
Which row classifies calcium oxide, calcium hydroxide and sulfur dioxide?
[Table_1]
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Copper(II) sulfate is prepared by adding excess copper(II) carbonate to sulfuric acid. Why is an \textit{excess} of copper(II) carbonate added?
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Part of the Periodic Table is shown. Which element has two electrons in its outer shell and three electron shells?
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Some information about element X is given.
- melting point = 64\degree C
- density = 0.86\ \text{g/cm}^3
- vigorous reaction with water
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The properties of the element titanium, Ti, can be predicted from its position in the Periodic Table. Which row identifies the properties of titanium? [Table_1]
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Which description of brass is correct?
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What is the symbol of the metal used in the manufacture of aircraft because of its low density?
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Which property of stainless steel makes it suitable for making cutlery?
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Which substances react to form hydrogen gas? 1. calcium and water 2. silver and dilute hydrochloric acid 3. magnesium and steam 4. zinc and dilute hydrochloric acid
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Some statements about the reactions of the metals tin, lithium and manganese are listed. • Tin does not react with steam but does react with dilute hydrochloric acid. • Lithium reacts with cold water. • Manganese does not react with cold water but does react with steam. What is the order of reactivity of the three metals?
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Which substances are required for iron to rust?
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Coke (carbon) and limestone are two raw materials used in the extraction of iron from hematite. Which type of reaction occurs when each substance is heated during the process? [Table_1]
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Water is treated at a waterworks to make it safe to drink. What is present in the water when it leaves the waterworks?
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The formulae of four compounds, W, X, Y and Z, are given. Which compounds are mixed to create a fertiliser containing the three elements necessary for improved plant growth?
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Some combustion reactions produce pollutant gases. Which reactions produce a pollutant gas that is not present in clean air? 1. \(2\text{CH}_4 + 3\text{O}_2 \rightarrow 2\text{CO} + 4\text{H}_2\text{O}\) 2. \(2\text{H}_2 + \text{O}_2 \rightarrow 2\text{H}_2\text{O}\) 3. \(\text{C} + \text{O}_2 \rightarrow \text{CO}_2\) 4. \(\text{N}_2 + \text{O}_2 \rightarrow 2\text{NO}\)
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Which row identifies the homologous series to which the molecular structure belongs? [Table_1]
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Petroleum is fractionally distilled at an oil refinery.
The table shows some fractions and uses.
[Table_1]
Which rows identify a use for the fraction listed?
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What is the word equation for the preparation of ethanol?
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Which row describes properties of aqueous ethanoic acid? [Table_1]
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Which row describes the relative sizes of monomer and polymer molecules? [Table_1]
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2.00 g of powdered calcium carbonate is added to 50.0 cm^3 of hydrochloric acid.
Which apparatus is used to measure these quantities of calcium carbonate and hydrochloric acid?
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The diagram shows a chromatogram obtained from the colours of three different sweets, X, Y, and Z. How many different red dyes are present in the sweets?
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A mixture contains sand and an aqueous solution of sodium chloride. Which processes are used to obtain a sample of solid sand and a sample of solid sodium chloride from the mixture?
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A student tests an unknown compound M. The compound: - produces a lilac flame using a flame test - produces a gas which turns limewater cloudy when dilute hydrochloric acid is added. What is M?
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