DF Multiple Choice Questions Flashcards

1
Q

Which molecule is a structural isomer of E-but-2-ene?

  • Z-but-2-ene
  • 2-methylbut-2-ene
  • methylpropane
  • methylpropene
A
  • methylpropene
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2
Q

Which statement must be true for an exothermic reaction?

  • More bonds are broken than are made
  • More bonds are made than are broken
  • More energy is released in breaking bonds than is required to make bonds
  • More energy is released in making bonds than is required to break bonds
A
  • More energy is released in making bonds than is required to break bonds
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3
Q

Which reaction would have a negative value for ΔH?

  • CaCO3(s) –> CaO(s) + CO2(g)
  • CaO(s) + H2O(l) –> Ca(OH)2(s)
  • 2H2O(l) –> 2H2(g) + O2(g)
  • K(g) –> K+(g) + e
A
  • CaO(s) + H2O(l) –> Ca(OH)2(s)
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4
Q

What amount of gas takes up 6 dm3 at 102 kPa and 25 °C?

  • 0.247 mol
  • 2.94 mol
  • 4.05 mol
  • 247 mol
A
  • 0.247 mol
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5
Q

Which statement is true of the first step in the mechanism of the reaction between ethene and hydrogen bromide?

  • The bromine atom accepts an electron pair from the carbon–carbon double bond.
  • The sigma bond between the two carbon atoms is broken.
  • A bromide ion is formed.
  • A carbon atom becomes negatively charged.
A
  • A bromide ion is formed.
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6
Q

Which of these is an advantage of using biodiesel as a substitute for petrol?

  • It is a renewable resource
  • No CO2 is released on combustion
  • It has a higher energy density
  • Less NOx is released on combustion
A
  • It is a renewable resource
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7
Q

The alkenes are an example of a homologous series of compounds.

Which statement is true for all members of any homologous series?

  • They all have the same molecular formula.
  • They all have the same general formula.
  • They all have the same physical properties.
  • They all react with bromine water.
A
  • They all have the same general formula.
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8
Q

A Hess cycle is shown below.

What is a correct expression for ΔH1 constructed using the Hess cycle shown?

  • ΔfH(C2H5OH) – [ΔfH(CH2CH2) + ΔfH(H2O)]
  • [ΔfH(CH2CH2) + ΔfH(H2O)] – ΔfH(C2H5OH)
  • ΔcH(CH2CH2) – ΔcH(C2H5OH)
  • ΔcH(C2H5OH) – ΔcH(CH2CH2)
A
  • ΔcH(CH2CH2) – ΔcH(C2H5OH)
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9
Q

What is the correct name for the compound shown below?

  • Z-but-2-ene
  • E-1-methyl-2-ethylethene
  • Z-1-methyl-2-ethylethene
  • Z-pent-2-ene
A
  • Z-pent-2-ene
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10
Q

Three flasks each contain 240 cm3 of a different gas, under the same conditions of room temperature and pressure.

Which of the following statements is/are true for all three of the flasks?

  1. They each contain the same number of gas molecules.
  2. They each contain 0.1 mol of gas.
  3. They each contain the same number of atoms.
  • 1,2, and 3
  • Only 1 and 2
  • Only 2 and 3
  • Only 1
A
  • Only 1
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