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SY26-Mid-Term Review #5

Quiz by Holappa, Todd

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16 questions
Show answers
  • Q1
    Which chemical formula represents a compound rather than an element?
    O₂
    NaCl
    N₂
    He
    30s
  • Q2
    Which of the following formulas represents a molecule found in the gaseous state at room temperature?
    NaCl
    H₂O
    CO₂
    CaCO₃
    30s
  • Q3
    What does the formula C₆H₁₂O₆ represent?
    A compound made of carbon, hydrogen, and oxygen
    A mixture of carbon and oxygen
    A simple element
    A single atom of glucose
    30s
  • Q4
    Which statement correctly describes the particles in a solid compared to a gas?
    Particles in a gas have no motion
    Particles in a solid move freely and spread apart
    Particles in a gas are tightly packed and vibrate
    Particles in a solid vibrate in fixed positions
    30s
  • Q5
    Which of the following represents a chemical change?
    Ice melting into water
    Water boiling into steam
    Sugar dissolving in tea
    Iron rusting to form Fe₂O₃
    30s
  • Q6
    Which statement correctly describes a physical property?
    Density of aluminum
    Ability of iron to rust
    Flammability of gasoline
    Reactivity of sodium with water
    30s
  • Q7
    Which of the following is a chemical formula for a compound formed during a chemical change?
    H₂O
    All of the above
    CO₂
    NaCl
    30s
  • Q8
    Which observation indicates a chemical change has occurred?
    A piece of paper is torn in half
    A candle burns and produces CO₂ and H₂O
    Salt is dissolved in water
    Water freezes into ice
    30s
  • Q9
    Which of the following is NOT a chemical property?
    Color of a substance
    Corrosiveness
    Ability to burn
    Reactivity with oxygen
    30s
  • Q10
    Which process involves a physical change only?
    Burning wood
    Dissolving sugar in water
    Rusting of iron
    Baking a cake
    30s
  • Q11
    When hydrogen gas (H₂) reacts with oxygen gas (O₂) to form water (H₂O), which statement best explains why the total mass remains the same?
    The mass decreases because water is lighter than gases
    The atoms disappear during the reaction
    New atoms are created during the reaction
    The number of atoms stays the same, only rearranged
    30s
  • Q12
    Which chemical equation correctly shows the Law of Conservation of Mass?
    H₂ + O₂ → 2H₂O
    2H₂ + 2O₂ → 2H₂O
    H₂ + O₂ → H₂O
    2H₂ + O₂ → 2H₂O
    30s
  • Q13
    If calcium (Ca) reacts with chlorine (Cl₂) to form calcium chloride (CaCl₂), what is the correct chemical formula for the product?
    CaCl₂
    Ca₂Cl
    CaCl
    Ca₂Cl₂
    30s
  • Q14
    Which statement describes how temperature affects chemical reactions?
    Increasing temperature slows down chemical reactions
    Increasing temperature speeds up chemical reactions
    Lowering temperature always stops chemical reactions completely
    Temperature has no effect on chemical reactions
    30s
  • Q15
    In the reaction: 2Na + Cl₂ → 2NaCl, what happens to the total mass of the system?
    It decreases because energy is released
    It changes because sodium and chlorine combine
    It increases because new substances are formed
    It stays the same because atoms are conserved
    30s

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