New Hampshire NH SAS Science Grade 8 Practice Questions - New Hampshire Statewide Assessment System Science - Grade 8 Exam - New Hampshire NH SAS Science Grade 8 Practice Questions - New Hampshire Statewide Assessment System Science

Question 1

A student seals 25 g of baking soda and 30 g of vinegar in a sealed plastic bag. After the fizzing stops, the student finds the bag now holds 50 g of liquid and gas. The student is confused because 25 + 30 = 55, not 50. Which conclusion is best supported by this observation?

Some matter appears missing because the bag was sealed but the balance was not precise enough to measure gas pressure. Matter is not conserved in a chemical reaction when gases are produced inside a sealed container. The reaction converted some of the reactants into energy, which is why the mass decreased. The mass was always conserved; the bag leaked gas and the total would still be 55 g if nothing escaped.

Correct Answer:

The mass was always conserved; the bag leaked gas and the total would still be 55 g if nothing escaped.

Question 2

A student places a small piece of steel wool on a digital balance and reads 5.00 g. After burning the steel wool in air, the gray wool becomes black and brittle, and the balance now reads 5.80 g. Which statement best explains why the mass increased?

The fire created new matter from the flame, adding mass to the wool. Oxygen from the air combined with the iron in the steel wool to form iron oxide, increasing the total mass. The heat caused the atoms in the steel wool to expand so each atom weighed more. The black coating is ash, which is lighter than steel, so the reading must be wrong.

Correct Answer:

Oxygen from the air combined with the iron in the steel wool to form iron oxide, increasing the total mass.

Question 3

Two clear liquids, A and B, are mixed in a beaker. The beaker feels cold to the touch and a white solid forms at the bottom. Which claim is best supported by these observations?

A chemical reaction occurred and released energy into the surroundings. A chemical reaction occurred and absorbed energy from the surroundings. A physical change occurred because no new substance was formed. The temperature drop proves the liquids simply evaporated.

Correct Answer:

A chemical reaction occurred and absorbed energy from the surroundings.

Question 4

A model of a substance shows particles packed tightly in a fixed, repeating pattern and vibrating in place. When energy is added, the particles begin sliding past one another while still touching. Which change of state does this model represent?

Melting from a solid to a liquid. Boiling from a liquid to a gas. Freezing from a liquid to a solid. Condensing from a gas to a liquid.

Correct Answer:

Melting from a solid to a liquid.

Question 5

A sample of an unknown pure substance is divided into two pieces. Piece 1 has a mass of 12 g and a volume of 4 cm³. Piece 2 has a mass of 24 g and a volume of 8 cm³. What can be concluded about the substance?

The substance is a compound because density changed with sample size. The density of both pieces is the same, 3 g/cm³, because density is an intensive property. Piece 2 is denser because it has more mass than Piece 1. The density cannot be determined without knowing the melting point.

Correct Answer:

The density of both pieces is the same, 3 g/cm³, because density is an intensive property.

Question 1

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Prepare with the New Hampshire NH SAS Science Grade 8 Practice Questions - New Hampshire Statewide Assessment System Science - Grade 8 Exam practice quiz. This question bank includes 100 questions covering student, explains, describes, mass, and energy. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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New Hampshire NH SAS Science Grade 8 Practice Questions - New Hampshire Statewide Assessment System Science - Grade 8 Exam

This practice set contains 100 questions from the matching question bank and focuses on student, explains, describes, mass, and energy. 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 Hampshire NH SAS Science Grade 8 Practice Questions - New Hampshire Statewide Assessment System Science - Grade 8 Exam

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