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Unit 1 Chemistry

Quiz by Jimmy Lin

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15 questions
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  • Q1
    An atom A has one electron in its outer shell and an atom B has six electrons in its outer shell. When they react, the most likely formula for the compound is
    AB2
    AB
    A2B
    AB6
    30s
  • Q2
    In the molten state, an ionic compound conducts electricity because
    the electrons are free to move
    the molecules are free to move
    the ions are free to move
    the atoms are free to move
    30s
  • Q3
    In dry ice (solid carbon dioxide) the carbon dioxide molecules are held together by
    covalent bonds
    dispersion forces
    dipole-dipole forces
    hydrogen bonds
    30s
  • Q4
    Polyethene can be produced in branched or unbranched form. Compared to the branched form, the unbranched form shows
    lower density and higher melting temperature
    higher density and higher melting temperature
    lower density and lower melting temperature
    higher density and lower melting temperature
    30s
  • Q5
    The number of lone pairs of electrons in the nitrogen molecule is
    4
    2
    6
    8
    30s
  • Q6
    Ionic compounds are often brittle, so that the crystal shatters when hit. This is because
    forces between the ions are weka
    the positive and negative ions neutralise each other
    layers of ions move and repulsion between ions of the same charge occurs
    the delocalised electrons are unable to hold the positive ions
    30s
  • Q7
    Allotropes are
    compounds with the same molecular formula but a different structural formula
    different physical forms of the same element
    atoms of the same elements with different numbers of neutrons
    elements in the same group in the periodic table
    30s
  • Q8
    A doubly negatively charged ion has either protons. The number of electrons in the ion is
    10
    6
    2
    8
    30s
  • Q9
    Which one of the following has a different electron configuration from the others?
    Na+
    F-
    K+
    Ne
    30s
  • Q10
    Which one of the following pairs of elements is most likely to combine to from a compound with properties similar to those of sodium chloride?
    phosphorus and chlorine
    carbon and oxygen
    calcium and bromine
    copper and nickel
    30s
  • Q11
    Isotopes of an element contain:
    the same atomic number and a different mass number
    a different atomic number an a different mass number
    the same atomic number and the same mass number
    a different atomic number and the same mass number
    30s
  • Q12
    The relative atomic mass of magnesium is 24.31. The most important reason why it is not a whole number is that
    the mass of the magnesium atom is compared to the mass of the 12-C isotope
    the relative atomic mass given is only an approximation
    magnesium atoms lose electrons when they react
    not all atoms of magnesium have the same number of neutrons
    30s
  • Q13
    The boiling temperature of alkanes increases as the number of carbon atoms increases because
    the forces within the molecules get stronger
    the hydrogen bonding increases with the extra hydrogen atoms present
    the number of structural isomers increases with the extra atoms present
    the dispersion forces get stronger with the extra atoms present
    30s
  • Q14
    Which one of the following groups of substances shows only covalent compounds?
    HCl, H2O, H2S, H2SO4
    CO2, N2, O2, KNO3
    NH3, H2O, Na2S, CO2
    NaCl, CH4, CO2, N2O
    30s
  • Q15
    Metals are malleable and ductile because when a metal is hit
    some of the atoms move but are held in a new position by the covalent bonds
    some of the delocalised electrons move the positive ions stay in position
    some of the ions move but are held in a new position by the delocalised electrons
    some of the protons move but are held in a new position by the neutrons
    30s

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