Alaska Science Grade 8 Practice Questions - Alaska Science Assessment, Grade 8 Exam - Alaska Science Grade 8 Practice Questions

Question 1

In a sealed jar, baking soda and vinegar react to form new substances. The total mass of the jar and its contents is measured before and after the reaction. What should the measurement show?

The total mass doubles because two substances react. The total mass stays the same because atoms are rearranged, not created or destroyed. The total mass increases because gas is produced. The total mass decreases because the solid baking soda disappears.

Correct Answer:

The total mass stays the same because atoms are rearranged, not created or destroyed.

Question 2

Which observation is the BEST evidence that a chemical reaction has occurred?

Salt dissolves completely in water. A new solid forms when two clear liquids are mixed and the temperature rises. Ice melts into liquid water in a warm room. A metal rod is bent into a new shape.

Correct Answer:

A new solid forms when two clear liquids are mixed and the temperature rises.

Question 3

A student models atoms of element X as one type of sphere and atoms of element Y as another type. Which diagram BEST represents a molecule of a compound made from X and Y?

Three X spheres not bonded to anything. A pile of X and Y spheres mixed but not bonded. Only Y spheres bonded to each other. Two X spheres bonded to one Y sphere.

Correct Answer:

Two X spheres bonded to one Y sphere.

Question 4

During a chemical reaction, atoms rearrange. Which statement is ALWAYS true?

The number of each type of atom is the same before and after the reaction. The number of molecules is always the same before and after the reaction. All products must be solids. Energy can never be released or absorbed.

Correct Answer:

The number of each type of atom is the same before and after the reaction.

Question 5

A student balances the reaction: 2H2 + O2 → 2H2O. Why must two water molecules appear on the product side?

So oxygen atoms are destroyed to make water. So the molecules stay the same size. So the number of hydrogen and oxygen atoms matches on both sides. So the reaction produces more mass than it starts with.

Correct Answer:

So the number of hydrogen and oxygen atoms matches on both sides.

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About this Exam

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

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Alaska Science Grade 8 Practice Questions - Alaska Science Assessment, Grade 8 Exam

This practice set contains 100 questions from the matching question bank and focuses on student, energy, wave, water, and force. 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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Alaska Science Grade 8 Practice Questions - Alaska Science Assessment, Grade 8 Exam

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