7th grade Science practice sheet
Oregon State Standards · from Gradelings · Name: ______________________
Question 1
Which particles are found in the nucleus (center) of an atom?
- only electrons
- neutrons and electrons
- electrons and protons
- protons and neutrons
protons and neutrons
Hint: Electrons move around the outside of the nucleus. Protons and neutrons are packed in the center.
Question 2
In salt water, which is the solvent?
🧪- salt water
- salt
- water
water
Hint: The solute is what dissolves (usually the smaller amount). The solvent does the dissolving (usually the larger amount). Together they make the solution.
Question 3
Water as ice, as liquid water and as water vapor has the same kind of particle. What differs in each state?
- Whether the water is pure
- How the particles are arranged and how they move
- The number of different substances
- The kind of particle
How the particles are arranged and how they move
Hint: Changing state changes the arrangement and motion, not the kind of particle.
Question 4
What is freezing?
- A gas changing to a liquid
- A solid changing to a liquid
- A liquid changing to a solid
A liquid changing to a solid
Hint: Cooling slows particles down until they stay in place.
Question 5
A hand warmer gets hot because of an…
- electric shock
- endothermic reaction
- physical change only
- exothermic reaction
exothermic reaction
Hint: Iron reacting with oxygen.
Question 6
Which plant is best suited to a very dry, windy field?
- One that needs shade all day
- One with deep taproots and narrow leaves
- One with wide, thin leaves and shallow roots
- One that needs flooded soil
One with deep taproots and narrow leaves
Hint: Deep roots reach water and narrow leaves lose less of it.
Question 7
Lake water warms during a heat wave and holds less dissolved oxygen. How might this affect fish?
- Fish are not affected at all
- Fish breathe more easily
- Fish that need a lot of oxygen may struggle to survive
- All fish grow faster
Fish that need a lot of oxygen may struggle to survive
Hint: Warm water holds less dissolved oxygen, an abiotic factor that fish need.
Question 8
A grasshopper eats grass. A frog eats the grasshopper. The frog is a…
- secondary consumer
- producer
- decomposer
- primary consumer
secondary consumer
Hint: A primary consumer eats producers. A secondary consumer eats primary consumers.
Question 9
Put the stages of primary succession in order.
- 🪨Bare rock
- 🌾Soil builds up and grasses grow
- 🌲A mature forest develops
- 🌱Shrubs and small trees take over
Bare rock → Soil builds up and grasses grow → Shrubs and small trees take over → A mature forest develops
Hint: Bare rock, then lichens and mosses, then soil and grasses, then shrubs, then forest.
Question 10
Earth's outer layer is broken into large pieces called…
- mantle cells
- tectonic plates
- crusts of ice
- cores
tectonic plates
Hint: They move slowly.
Answer key
- 1. protons and neutrons (Atoms & Elements)
- 2. water (Mixtures & Solutions)
- 3. How the particles are arranged and how they move (Particles & Mixtures)
- 4. A liquid changing to a solid (Particles and Heat)
- 5. exothermic reaction (Chemical Reactions)
- 6. One with deep taproots and narrow leaves (How Plants Work)
- 7. Fish that need a lot of oxygen may struggle to survive (Ecosystems)
- 8. secondary consumer (Food Chains & Energy)
- 9. Bare rock → Soil builds up and grasses grow → Shrubs and small trees take over → A mature forest develops (Cycles & Succession)
- 10. tectonic plates (Earth's Moving Surface)
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.