OSAS Science Grade 8 Practice Questions - Oregon Statewide Assessment System - Science, Grade 8 Exam - OSAS Science Grade 8 Practice Questions - Oregon Statewide Assessment System

Question 1

A student places an ice cube on a warm plate. As the ice melts, it changes from a solid to a liquid. According to the particle model of matter, what is happening to the particles in the ice as it melts?

The particles are breaking apart into smaller particles The particles are gaining energy and moving more freely, but remain the same kind of molecule The particles are being destroyed and replaced by new liquid particles The particles are shrinking in size so they can flow past each other

Correct Answer:

The particles are gaining energy and moving more freely, but remain the same kind of molecule

Question 2

A sealed container holds nitrogen gas at room temperature. A student compares the nitrogen gas particles to the particles in a solid block of iron at the same temperature. Which statement best describes the difference in particle behavior?

The gas particles vibrate in fixed positions while the iron particles move randomly throughout the solid The gas particles move rapidly and randomly, filling the container, while the iron particles vibrate around fixed positions Both the gas and iron particles move in straight lines through the container at the same speed The gas particles are stationary and only move when the container is shaken

Correct Answer:

The gas particles move rapidly and randomly, filling the container, while the iron particles vibrate around fixed positions

Question 3

Two identical balloons are filled with helium. Balloon A is placed in a warm room and Balloon B is placed in a cold refrigerator. After one hour, the student observes that Balloon A is larger than Balloon B. Using the kinetic theory of matter, which statement best explains this observation?

The helium particles in Balloon A move faster and collide with the walls harder and more often, exerting more outward pressure The helium particles in Balloon A lose energy and become larger in size, taking up more space The cold temperature in Balloon B causes the helium particles to multiply, increasing the pressure The warm room adds new helium particles to Balloon A through the rubber walls

Correct Answer:

The helium particles in Balloon A move faster and collide with the walls harder and more often, exerting more outward pressure

Question 4

A student records the mass of a steel wool sample before burning it in the air. After burning, the steel wool appears smaller and partially turned to ash. When the student measures the mass of the remaining steel wool and ash, it is slightly greater than the original mass. Which statement best explains this result?

Mass was created during the burning process Oxygen gas from the air combined chemically with the iron in the steel wool, adding to the total mass The scale is inaccurate because burning always destroys mass The ash has negative mass, which mathematically increases the total

Correct Answer:

Oxygen gas from the air combined chemically with the iron in the steel wool, adding to the total mass

Question 5

In a sealed, airtight flask, a student mixes 20 g of baking soda with 50 g of vinegar. Bubbles form and the mixture fizzes. After the reaction stops, the student measures the total mass of everything inside the sealed flask. What should the total mass be?

Less than 70 g, because the gas bubbles escaped Exactly 70 g, because the flask is sealed and mass is conserved More than 70 g, because chemical reactions create new mass Zero, because everything turned into gas

Correct Answer:

Exactly 70 g, because the flask is sealed and mass is conserved

Question 1

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

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OSAS Science Grade 8 Practice Questions - Oregon Statewide Assessment System - Science, Grade 8 Exam

This practice set contains 100 questions from the matching question bank and focuses on student, mass, energy, explains, and wave. 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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OSAS Science Grade 8 Practice Questions - Oregon Statewide Assessment System - Science, Grade 8 Exam

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