RISE Science Grade 8 Practice Questions - RISE Science - Grade 8 Exam - RISE Science Grade 8 Practice Questions - RISE Science

Question 1

A student pours 50 mL of vinegar into a flask and adds 10 g of baking soda. She immediately seals the flask with a tight rubber stopper. A gas forms and inflates a balloon attached to the flask. When she measures the total mass of the sealed apparatus before and after the reaction, the mass remains exactly 160 grams. Which principle does this phenomenon demonstrate?

Gas molecules have no mass when produced in a reaction. Total mass is conserved in a closed system during a chemical reaction. Chemical reactions create new matter that replaces the original reactants. Energy is converted into mass when bubbles are generated.

Correct Answer:

Total mass is conserved in a closed system during a chemical reaction.

Question 2

An iron nail with a mass of 5.0 grams is left in a humid environment for several weeks. When re-weighed, the rusty nail has a mass of 5.7 grams. Why did the mass of the solid nail increase?

Iron atoms multiplied inside the nail due to exposure to water. Oxygen gas from the surrounding air chemically bonded with iron atoms to form rust. The nail absorbed heat energy which added extra mass to the solid metal. Rust is denser than pure iron, so the nail gained weight without adding atoms.

Correct Answer:

Oxygen gas from the surrounding air chemically bonded with iron atoms to form rust.

Question 3

A block of solid dry ice (carbon dioxide) is placed on a table at room temperature. White foggy gas immediately begins billowing off the block, and after one hour no solid remains. Which statement correctly describes this event?

It is a chemical reaction because a new gas substance with different properties was created. It is a physical change (sublimation) because the carbon dioxide molecules changed state without breaking chemical bonds. It is a chemical change because carbon dioxide atoms disappeared permanently. It is a physical change because the total mass of the room decreased.

Correct Answer:

It is a physical change (sublimation) because the carbon dioxide molecules changed state without breaking chemical bonds.

Question 4

A hiker activates an instant hand warmer pouch by squeezing it to mix iron powder, water, and salt. Within minutes, the pouch feels warm to the touch. What type of reaction is occurring inside the pouch?

An endothermic chemical reaction that absorbs thermal energy from the hiker's hands. An exothermic chemical reaction that releases stored chemical energy as thermal energy. A physical phase change where liquid water freezes into solid ice. A nuclear reaction that converts iron atoms into helium gas.

Correct Answer:

An exothermic chemical reaction that releases stored chemical energy as thermal energy.

Question 5

An athletic trainer snaps an instant cold pack to mix water and solid ammonium nitrate. The cold pack quickly drops in temperature from 22°C to 4°C. How should this phenomenon be classified?

An exothermic reaction because thermal energy is destroyed. An endothermic process because thermal energy is absorbed from the surroundings. A physical change because no energy transfer took place. An exothermic reaction because cold energy is released into the skin.

Correct Answer:

An endothermic process because thermal energy is absorbed from the surroundings.

Question 1

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Prepare with the RISE Science Grade 8 Practice Questions - RISE Science - Grade 8 Exam practice quiz. This question bank includes 90 questions covering water, mass, reaction, energy, and solid. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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RISE Science Grade 8 Practice Questions - RISE Science - Grade 8 Exam

This practice set contains 90 questions from the matching question bank and focuses on water, mass, reaction, energy, and solid. 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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RISE Science Grade 8 Practice Questions - RISE Science - Grade 8 Exam

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