LEAP 2025 Science Grade 8 Practice Questions - LEAP 2025 Science - Grade 8 Exam - LEAP 2025 Science Grade 8 Practice Questions - LEAP 2025 Science

Question 1

Which statement best describes the difference between a simple molecule like water (H₂O) and an extended crystalline structure like table salt (NaCl)?

Water consists of distinct individual molecules, while table salt forms a repeating 3D lattice of bonded ions. Water consists of thousands of linked monomers, while table salt contains only two bonded atoms. Water forms a rigid solid network at room temperature, while table salt is composed of loose gas molecules. Water molecules are held together by ionic bonds, while table salt crystals are held together by covalent gas bonds.

Correct Answer:

Water consists of distinct individual molecules, while table salt forms a repeating 3D lattice of bonded ions.

Question 2

Synthetic polymers, such as polyethylene plastic, are composed of microscopic chemical structures that can best be modeled as:

Isolated single atoms floating independently without chemical bonds Unbonded mixtures of liquid water and metallic elements Long repeating chains of smaller subunit molecules called monomers Simple three-atom gaseous compounds arranged in random clusters

Correct Answer:

Long repeating chains of smaller subunit molecules called monomers

Question 3

Which natural resource serves as the primary raw material used by chemical industries to produce synthetic plastics like polypropylene and polystyrene?

Atmospheric oxygen gas Crude petroleum oil Crushed limestone rock Fresh river water

Correct Answer:

Crude petroleum oil

Question 4

A student mixes two liquid chemical solutions in an insulated cup. The initial temperature of both solutions is 22°C. After mixing, the solution temperature rapidly rises to 41°C. What type of reaction occurred?

An exothermic reaction that released thermal energy to the surroundings An endothermic reaction that absorbed thermal energy from the surroundings A physical phase change where liquid water converted into solid ice A nuclear decay process that destroyed all atoms in the cup

Correct Answer:

An exothermic reaction that released thermal energy to the surroundings

Question 5

When solid ammonium nitrate dissolves in water inside an instant cold pack, the temperature of the pack drops from 24°C to 8°C. What process explains this temperature change?

An exothermic process in which thermal energy is released into the surroundings An endothermic process in which energy is absorbed from the surroundings A combustion reaction that generates light and intense heat A nuclear fusion reaction that creates heavier elements

Correct Answer:

An endothermic process in which energy is absorbed from the surroundings

Question 1

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Prepare with the LEAP 2025 Science Grade 8 Practice Questions - LEAP 2025 Science - Grade 8 Exam practice quiz. This question bank includes 100 questions covering energy, water, rock, layers, and chemical. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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LEAP 2025 Science Grade 8 Practice Questions - LEAP 2025 Science - Grade 8 Exam

This practice set contains 100 questions from the matching question bank and focuses on energy, water, rock, layers, and chemical. 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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LEAP 2025 Science Grade 8 Practice Questions - LEAP 2025 Science - Grade 8 Exam

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