Grade 9 Science practice sheet
Nunavut Curriculum · from Gradelings · Name: ______________________
Question 1
A bee gets nectar from a flower and carries pollen to other flowers. What kind of relationship is this?
- mutualism
- parasitism
- predation
- commensalism
mutualism
Hint: In mutualism both organisms benefit.
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
When a sperm cell and an egg cell join
Hint: Fertilization combines genetic material from two parents into a new cell.
Question 3
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
📏 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.
Question 4
How many electron shells (energy levels) are used by a neutral fluorine atom?
- 1
- 2
- 3
- 4
2
Hint: Fluorine has 9 electrons arranged 2-7, so 2 shells are in use.
Question 5
A cold pack gets cold when the chemicals inside are mixed. This is an example of…
- a physical change only
- an exothermic reaction
- an endothermic reaction
- combustion
an endothermic reaction
Hint: Endothermic reactions take in energy from the surroundings, so the surroundings get cooler.
Question 6
Dilution can reduce a pollutant's concentration. Why is it not a complete solution?
- The substance is still in the environment and can build up in living things
- Dilution destroys the substance
- Dilution makes it more toxic
- Dilution makes it a gas
The substance is still in the environment and can build up in living things
Hint: Spreading a substance out makes it less concentrated, but it does not make it go away.
Question 7
An object has 23 protons and 20 electrons. Which describes it?
- negatively charged
- positively charged
- neutral
positively charged
Hint: Fewer electrons than protons gives a net positive charge.
Question 8
What is the SI unit of potential difference (voltage)?
- joule (J)
- volt (V)
- ampere (A)
- ohm (Ω)
volt (V)
Hint: Potential difference is the energy given to each unit of charge. Its symbol is V.
Question 9
A solar cell changes…
- sound to heat
- light energy to electrical energy
- electrical energy to light
- heat to sound
light energy to electrical energy
Hint: A solar cell is a source, not a load.
Question 10
Which Canadian-built robotic arm is used on the International Space Station?
- Skylab
- Voyager
- Sputnik
- Canadarm2
Canadarm2
Hint: Canadarm2 moves equipment and helps astronauts working outside the station.
Answer key
- 1. mutualism (Biodiversity & Heredity)
- 2. When a sperm cell and an egg cell join (Reproduction)
- 3. 📏 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)
- 4. 2 (Atoms & Electrons)
- 5. an endothermic reaction (Chemical Change)
- 6. The substance is still in the environment and can build up in living things (Chemistry & the Environment)
- 7. positively charged (Static Electricity)
- 8. volt (V) (Circuits & Ohm's Law)
- 9. light energy to electrical energy (Electrical Energy)
- 10. Canadarm2 (Space Exploration)
Want more than 10 questions?
In Gradelings the questions change every time and adjust to your child, with hints and kind feedback. See all science units.