New Jersey NJSLA Science Grade 8 Practice Questions - New Jersey Student Learning Assessments - Science Grade 8 Exam - New Jersey NJSLA Science Grade 8 Practice Questions - New Jersey Student Learning Assessments

Question 1

A student draws a model of water (H2O) as two hydrogen atoms bonded to one oxygen atom. Which feature must the model show to correctly represent that water is a compound and not a mixture?

The hydrogen and oxygen atoms are chemically bonded in a fixed ratio. The hydrogen and oxygen atoms are physically mixed but can be separated by filtering. The atoms are clustered together but each keeps its original properties. The oxygen atom is larger than the two hydrogen atoms so they stick to it.

Correct Answer:

The hydrogen and oxygen atoms are chemically bonded in a fixed ratio.

Question 2

Which property is most useful for identifying a pure substance regardless of how big the sample is?

Boiling point Mass Volume Total number of atoms

Correct Answer:

Boiling point

Question 3

A company makes a synthetic plastic that is stronger and lighter than natural rubber. Which statement best compares the synthetic plastic to the natural rubber?

Both are made of atoms that combine to form molecules with different properties. Synthetic materials are always better for the environment than natural materials. Natural rubber has atoms but synthetic plastic is made of chemicals, not atoms. Synthetic materials cannot be recycled because they are artificial.

Correct Answer:

Both are made of atoms that combine to form molecules with different properties.

Question 4

A sealed balloon is placed in a freezer. What happens to the motion of the gas particles inside the balloon as it cools?

The particles slow down because they have less thermal energy. The particles stop moving completely. The particles speed up because cold makes them move more. The particles move faster to generate heat.

Correct Answer:

The particles slow down because they have less thermal energy.

Question 5

A metal spoon and a wooden spoon sit in a pot of hot soup. After a minute, the metal spoon is too hot to hold but the wooden spoon is still cool. Which explanation is correct?

Metal transfers thermal energy more quickly than wood because it is a better conductor. Metal absorbs more total heat than wood because it is heavier. Wood does not allow any heat to enter it because it is an insulator. Metal creates heat when it touches hot liquids.

Correct Answer:

Metal transfers thermal energy more quickly than wood because it is a better conductor.

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About this Exam

Prepare with the New Jersey NJSLA Science Grade 8 Practice Questions - New Jersey Student Learning Assessments - Science Grade 8 Exam practice quiz. This question bank includes 100 questions covering student, water, energy, wave, and model. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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New Jersey NJSLA Science Grade 8 Practice Questions - New Jersey Student Learning Assessments - Science Grade 8 Exam

This practice set contains 100 questions from the matching question bank and focuses on student, water, energy, wave, and model. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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New Jersey NJSLA Science Grade 8 Practice Questions - New Jersey Student Learning Assessments - Science Grade 8 Exam

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