OSTP Science Grade 8 Practice Questions - Oklahoma School Testing Program - Science, Grade 8 Exam - OSTP Science Grade 8 Practice Questions - Oklahoma School Testing Program

Question 1

A model of an atom is labeled to show three kinds of subatomic particle: protons, neutrons and electrons. Which statement correctly identifies the electrical charge and relative location of each of these particles?

Protons have a positive charge and neutrons have no charge, both residing in the nucleus; electrons have a negative charge and reside outside the nucleus. Protons have a negative charge and electrons have a positive charge, both residing inside the nucleus; neutrons orbit outside. Electrons have no charge and neutrons have a positive charge, residing in the nucleus; protons orbit outside. All subatomic particles carry a positive charge and are evenly distributed throughout the entire atom.

Correct Answer:

Protons have a positive charge and neutrons have no charge, both residing in the nucleus; electrons have a negative charge and reside outside the nucleus.

Question 2

What fundamental distinction exists between molecular substances and extended crystal structures?

Molecular substances contain distinct, independent molecular units, whereas extended structures consist of an interconnected repeating network of bonded atoms. Molecular substances are always solids at room temperature, while extended structures are always gases. Extended structures do not contain chemical bonds between constituent atoms. Molecular substances contain millions of different elements, whereas extended structures contain only one atom total.

Correct Answer:

Molecular substances contain distinct, independent molecular units, whereas extended structures consist of an interconnected repeating network of bonded atoms.

Question 3

Which statement describes how synthetic materials are created from natural resources?

Natural resources undergo chemical synthesis, where chemical reactions rearrange atoms to produce materials with properties distinct from the original raw materials. Synthetic materials are gathered directly from nature without undergoing any physical or chemical processing. Natural resources are physically mixed without breaking or forming any chemical bonds to create synthetic polymers. Synthetic materials are created out of empty space without using any natural matter or energy.

Correct Answer:

Natural resources undergo chemical synthesis, where chemical reactions rearrange atoms to produce materials with properties distinct from the original raw materials.

Question 4

Which observation provides empirical evidence that a chemical reaction occurred?

The formation of a new gas and a thermal energy change indicate that chemical bonds rearranged to form new substances. The total liquid volume in the beaker increased because the water expanded. The tablet sank to the bottom of the beaker due to gravitational attraction. The water remained clear and transparent throughout the experiment.

Correct Answer:

The formation of a new gas and a thermal energy change indicate that chemical bonds rearranged to form new substances.

Question 5

What reading will the digital balance show after the chemical reaction completes?

150 g, because the total number and types of atoms are conserved in a closed system during a chemical reaction. 120 g, because gas escaping into the air reduces the mass of the closed flask. 180 g, because new gas molecules add extra weight to the system. 0 g, because chemical energy destroys mass during reaction.

Correct Answer:

150 g, because the total number and types of atoms are conserved in a closed system during a chemical reaction.

Question 1

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Prepare with the OSTP Science Grade 8 Practice Questions - Oklahoma School Testing Program - Science, Grade 8 Exam practice quiz. This question bank includes 100 questions covering energy, correctly, data, force, and mass. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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OSTP Science Grade 8 Practice Questions - Oklahoma School Testing Program - Science, Grade 8 Exam

This practice set contains 100 questions from the matching question bank and focuses on energy, correctly, data, force, and mass. 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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OSTP Science Grade 8 Practice Questions - Oklahoma School Testing Program - Science, Grade 8 Exam

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