Section 4. States of matter for Chemistry, A Level - revisedeck

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4. States of matter

A section of Chemistry, 9701

Listing 10 of 260 questions

Which solid-line curve most accurately represents the distribution of molecular speeds in a gas at 500 K if the dotted-line curve represents the corresponding distribution for the same gas at 300 K?

9701_w11_qp_13

MCQ

2011

Paper 1, Variant 3

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Which diagram shows the correct graph of V against p for a fixed mass of an ideal gas at constant temperature?

9701_w12_qp_13

MCQ

2012

Paper 1, Variant 3

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Use of the Data Booklet is relevant to this question. The volume of a sample of ammonia was measured at a temperature of 40 °C and a pressure of 95 kPa. The volume measured was 4.32 × 10–5 m3. What is the mass of the sample of ammonia?

9701_w12_qp_13

MCQ

2012

Paper 1, Variant 3

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An element X and compound YZ react separately with acid as shown...

9701_w12_qp_13

MCQ

2012

Paper 1, Variant 3

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Use of the Data Booklet is relevant to this question. The approximate percentage composition of the atmosphere on four different planets is given in the table below. The density of a gas may be defined as the mass of 1 dm3 of the gas measured at s.t.p. Which mixture of gases has the greatest density?

9701_w13_qp_11

MCQ

2013

Paper 1, Variant 1

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Use of the Data Booklet is relevant to this question. The approximate percentage composition of the atmosphere on four different planets is given in the table below. The density of a gas may be defined as the mass of 1 dm3 of the gas measured at s.t.p. Which mixture of gases has the greatest density?

9701_w13_qp_12

MCQ

2013

Paper 1, Variant 2

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Measured values of the pressure, volume and temperature of a known mass of a gaseous compound are to be substituted into the equation pV = nRT. The measurements are used to calculate the relative molecular mass, Mr, of a compound. Which conditions of pressure and temperature would give the most accurate value of Mr?

9701_w13_qp_13

MCQ

2013

Paper 1, Variant 3

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Use of the Data Booklet is relevant to this question. When an evacuated fluorescent light tube of volume 300 cm3 is filled with a gas at 300 K and 101 kPa, the mass of the tube increases by 1.02 g. The gas obeys the ideal gas equation pV = nRT. What is the identity of the gas?

9701_w13_qp_13

MCQ

2013

Paper 1, Variant 3

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State two assumptions of the kinetic theory of gases, as applied to ideal gases. State the conditions of temperature and pressure under which real gases behave least like an ideal gas. Explain why real gases do not behave ideally under these conditions. Gaseous aluminium chloride is dimeric at low temperatures, but the dimer dissociates on heating. Al 2Cl 62Al Cl 3State whether this dissociation is endothermic or exothermic. Explain your answer. Choose one reaction in organic chemistry that is catalysed by Al Cl 3, and write the structural formulae of the reactants and products in the boxes below. Al Cl 3

9701_w13_qp_43

THEORY

2013

Paper 4, Variant 3

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Which solid-line curve most accurately represents the distribution of molecular energies in a gas at 500 K if the dotted-line curve represents the corresponding distribution for the same gas at 300 K?

9701_w14_qp_11

MCQ

2014

Paper 1, Variant 1

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Questions Discovered

260