8th Grade Physical Science Worksheet Answers

📆 Updated: 1 Jan 1970
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🔖 Category: 8th Grade

Are you an 8th-grade student studying Physical Science and in need of answers to your worksheets? Look no further! We understand the importance of having accurate and reliable answers to reinforce your understanding of key concepts. In this blog post, we will provide you with the assistance you need to ace your Physical Science worksheets.



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What is the definition of physical science?

Physical science is a branch of natural science that studies non-living systems, including physics, chemistry, astronomy, and geology. It focuses on understanding the fundamental laws and principles that govern the physical world and how they interact to explain various phenomena and processes.

What is the difference between a physical change and a chemical change?

A physical change involves a change in the appearance or state of a substance without affecting its chemical composition, such as melting, freezing, or dissolving. On the other hand, a chemical change involves a transformation of one or more substances into different substances with new chemical properties, like combustion, rusting, or digestion. In summary, while physical changes alter the physical appearance or state of a substance, chemical changes result in the formation of new substances with different chemical properties.

Give an example of a physical change.

Melting of ice into water is an example of a physical change. In this process, the chemical composition of water remains the same, but its physical state changes from solid (ice) to liquid (water) due to an increase in temperature.

Give an example of a chemical change.

An example of a chemical change is the combustion of gasoline in a car engine. During this process, the hydrocarbons in gasoline combine with oxygen in the air to produce carbon dioxide, water vapor, and energy in the form of heat and light. This is a chemical reaction where new substances are formed, indicating a chemical change.

What is the Law of Conservation of Mass?

The Law of Conservation of Mass states that in a chemical reaction, matter is neither created nor destroyed, but only rearranged. This means that the total mass of the products of a chemical reaction must be equal to the total mass of the reactants. The number of atoms of each element present before and after the reaction must be the same, demonstrating that mass is conserved during a chemical change.

Describe the three states of matter.

The three states of matter are solid, liquid, and gas. In the solid state, particles are closely packed together and have a fixed shape and volume. Liquids have particles that are close together but can move past one another, giving them a fixed volume but not a fixed shape. Gases have particles that are spread out and move freely, taking on the shape and volume of their container. Temperature and pressure can affect how matter changes between these states.

Explain how temperature affects the kinetic energy of particles.

Temperature affects the kinetic energy of particles by directly influencing their speed and movement. When temperature increases, the average kinetic energy of particles also increases, leading to faster and more energetic movement. This is because higher temperatures provide more thermal energy to the particles, causing them to vibrate and collide with greater force. Conversely, lower temperatures result in decreased kinetic energy and slower particle movement. Overall, temperature serves as a crucial factor in determining the amount of kinetic energy present in a system.

What is an atom?

An atom is the basic unit of matter that is made up of protons, neutrons, and electrons. Protons and neutrons are located in the nucleus at the center of the atom, while electrons orbit around the nucleus in specific energy levels. Atoms combine to form molecules, which are the building blocks of all substances in the universe.

Describe the structure of an atom.

An atom consists of a nucleus at its center, which contains protons and neutrons. Electrons orbit around the nucleus in energy levels or shells. Protons have a positive charge, neutrons have no charge, and electrons have a negative charge. The number of protons in the nucleus determines the element, while the number of electrons in the energy levels determines the atom's overall charge.

What is the difference between an element and a compound?

An element is a pure substance composed of only one type of atom, such as oxygen or iron, while a compound is a substance made up of two or more elements that are chemically bonded together in a fixed ratio, like water (H2O) or salt (NaCl). Elements cannot be broken down into simpler substances by chemical means, whereas compounds can be broken down into their constituent elements through chemical reactions.

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