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Chemistry Midterm Part 2

Quiz by Tina Gainey

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15 questions
Show answers
  • Q1
    An atom has 29 protons, 29 electrons, and 35 neutrons. What is the mass number of the atom?
    29
    35
    93
    64
    30s
  • Q2
    Which drawing best represents an atom of lithium?
    Question Image
    C
    B
    D
    A
    30s
  • Q3
    Which of the following shows an example of a chemical change?
    Question Image
    A
    D
    C
    B
    30s
  • Q4
    Which of the following statements explains why oxygen is classified as a pure substance and air is classified as a mixture?
    Oxygen is more reactive than air.
    Oxygen has a higher density than air.
    Oxygen undergoes phase changes, whereas air is always a gas.
    Oxygen contains only one substance, but air contains several substances.
    30s
  • Q5
    What is the atomic number of an element whose atoms each contain 47 protons, 60 neutrons, and 47 electrons?
    60
    13
    47
    107
    30s
  • Q6
    The formula for density (D) is D = m/v where m is mass in grams and v is volume in cm3. Use this formula to solve the following problem: The density of a substance is 2 g/cm3. The mass is 4 g. What is the volume?
    Question Image
    D
    A
    C
    B
    30s
  • Q7
    Which of the following do water (H2O), rust (Fe2O3), and salt (NaCl) have in common?
    Water, rust, and salt are elements.
    Water, rust, and salt are elements.
    Water, rust, and salt are mixtures.
    Water, rust, and salt are compounds.
    30s
  • Q8
    Which diagram illustrates the safest method of heating a solution in a test tube? [Note: The student heating the tub is to the left of each diagram.]
    Question Image
    A
    D
    B
    C
    30s
  • Q9
    When electricity passes through water, hydrogen and oxygen are produced. Which table correctly labels the compounds and elements involved in the process?
    Question Image
    D
    C
    B
    A
    30s
  • Q10
    Given: • = particle X ◦ = particle Z Which diagram represents a mixture?
    Question Image
    B
    A
    D
    C
    30s
  • Q11
    In order for an atom to have a neutral charge, it must have an equal number of
    protons and neutrons
    protons and electrons
    nucleons and protons
    neutrons and electrons
    30s
  • Q12
    Which of these types of nuclear radiation has the greatest penetrating power?
    gamma
    alpha
    beta
    neutron
    30s
  • Q13
    What is the total number of valence electrons in a fluorine atom in the ground state?
    2
    9
    7
    5
    30s
  • Q14
    In scientific notation, 54,000,000 is expressed as
    Question Image
    C
    D
    B
    A
    30s
  • Q15
    Which terms are used to identify pure substances?
    an element and a compound
    a solution and a compound
    an element and a mixture
    a solution and a mixture
    30s

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