PencilGoPencilGo

Science Review

Grade 5 · Stretch challenge · 10 questions · Version PG-Z2VFOV-178N

1.

What is the pH of a neutral solution?

2.

Why are food webs more realistic than single food chains?

3.

What does conservation of energy mean?

4.

What evidence shows a chemical reaction occurred?

5.

How do greenhouse gases warm Earth?

6.

State Newton's third-law force pair when swimming.

7.

What is the role of chlorophyll?

8.

Which layer of Earth is liquid iron and nickel?

9.

What is the difference between weather and climate?

10.

What cell structure contains genetic material?

Answers and teaching notes

Use the answers to check the work after the learner finishes. For writing prompts, the guide describes what a strong response should include.

Show answers for version 12
  1. What is the pH of a neutral solution?7
  2. Why are food webs more realistic than single food chains?Organisms have multiple food sources and predators
  3. What does conservation of energy mean?Energy changes form but is not created or destroyed
  4. What evidence shows a chemical reaction occurred?New substances form
  5. How do greenhouse gases warm Earth?They absorb and re-emit infrared energy
  6. State Newton's third-law force pair when swimming.Push water back; water pushes swimmer forward
  7. What is the role of chlorophyll?Absorb light for photosynthesis
  8. Which layer of Earth is liquid iron and nickel?Outer core
  9. What is the difference between weather and climate?Weather is short-term; climate is long-term patterns
  10. What cell structure contains genetic material?The nucleus

Worked example

Connect the question to an observable process or scientific model.

Common mistake

Selecting a familiar term without checking its meaning.

Helpful hint

Explain why your answer makes sense.