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Grade 9 Science practice sheet

Manitoba Curriculum · from Gradelings · Name: ______________________

  1. Question 1

    Before a cell divides, the DNA is…

    • removed from the cell
    • copied, so each new cell gets a full set
    • split into random pieces
    • destroyed
    Show answer

    copied, so each new cell gets a full set

    Hint: DNA replication ensures each daughter cell receives complete instructions.

  2. Question 2

    What is fertilization?

    • When a sperm cell and an egg cell join
    • When a plant makes sugar
    • When a seed is planted
    • When a cell divides in two
    Show answer

    When a sperm cell and an egg cell join

    Hint: Fertilization combines genetic material from two parents into a new cell.

  3. Question 3

    How many electron shells (energy levels) are used by a neutral fluorine atom?

    • 1
    • 2
    • 3
    • 4
    Show answer

    2

    Hint: Fluorine has 9 electrons arranged 2-7, so 2 shells are in use.

  4. Question 4

    Ionic or covalent? Sort each compound.

    Sort into: ⚡ Ionic · 🤝 Covalent

    • 🔥CH₄ (methane)
    • 🧂NaCl (table salt)
    • ⚗️MgO (magnesium oxide)
    • 🧪KBr (potassium bromide)
    • 🌫️CO₂ (carbon dioxide)
    • 💧H₂O (water)
    • 🧴NH₃ (ammonia)
    • 🧊CaCl₂ (calcium chloride)
    Show answer

    ⚡ Ionic: NaCl (table salt), MgO (magnesium oxide), KBr (potassium bromide), CaCl₂ (calcium chloride) · 🤝 Covalent: CH₄ (methane), CO₂ (carbon dioxide), H₂O (water), NH₃ (ammonia)

    Hint: Ionic compounds are usually a metal plus a non-metal (like NaCl). Covalent compounds are usually two or more non-metals sharing electrons (like H₂O).

  5. Question 5

    What is static electricity?

    • Heat in a circuit
    • A flow of charge in a wire
    • A build-up of electric charge on an object
    • A kind of battery
    Show answer

    A build-up of electric charge on an object

    Hint: Rubbing materials together can transfer electrons, leaving objects charged.

  6. Question 6

    Lithium has electrons arranged 2, 1. Which period (row) is it in?

    answer box

    Show answer

    2

    Hint: The number of occupied shells is the period number: 2.

  7. Question 7

    Physical or chemical property? Sort each.

    Sort into: 📏 Physical property · 🧪 Chemical property

    • 🔌Copper conducts electricity
    • 🧂Salt dissolves in water
    • ⚗️Baking soda reacts with vinegar
    • ♨️Water boils at 100 °C
    • 🟤Iron rusts in damp air
    • ⚫Silver tarnishes
    Show answer

    📏 Physical property: Copper conducts electricity, Salt dissolves in water, Water boils at 100 °C · 🧪 Chemical property: Baking soda reacts with vinegar, Iron rusts in damp air, Silver tarnishes

    Hint: A physical property can be seen or measured without making a new substance. A chemical property describes how a substance reacts or changes into a new one.

  8. Question 8

    An object has 23 protons and 20 electrons. Which describes it?

    • negatively charged
    • positively charged
    • neutral
    Show answer

    positively charged

    Hint: Fewer electrons than protons gives a net positive charge.

  9. Question 9

    Alternating current changes direction…

    • never
    • many times each second
    • once an hour
    Show answer

    many times each second

    Hint: Household electricity in Canada alternates 60 times per second (60 Hz).

  10. Question 10

    Older fossils are usually found in…

    • water only
    • higher layers
    • deeper rock layers
    Show answer

    deeper rock layers

    Hint: Rock layers settle in order, with the oldest at the bottom (unless disturbed).

Answer key

  1. 1. copied, so each new cell gets a full set (Cells from Cells)
  2. 2. When a sperm cell and an egg cell join (Reproduction)
  3. 3. 2 (Atoms & Electrons)
  4. 4. ⚡ Ionic: NaCl (table salt), MgO (magnesium oxide), KBr (potassium bromide), CaCl₂ (calcium chloride) · 🤝 Covalent: CH₄ (methane), CO₂ (carbon dioxide), H₂O (water), NH₃ (ammonia) (Electrons & Compounds)
  5. 5. A build-up of electric charge on an object (Electric Current)
  6. 6. 2 (The Periodic Table)
  7. 7. 📏 Physical property: Copper conducts electricity, Salt dissolves in water, Water boils at 100 °C · 🧪 Chemical property: Baking soda reacts with vinegar, Iron rusts in damp air, Silver tarnishes (Elements & Compounds)
  8. 8. positively charged (Static Electricity)
  9. 9. many times each second (Making Electricity)
  10. 10. deeper rock layers (Evolution & Selection)

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