Physical Science SSA Review

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What is sound and how does it travel?

Back

Sound is a type of energy that travels in waves through different mediums such as air, water, and solids. It travels faster through solids than through liquids and gases.

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NGSS.MS-PS4-2

Front

Why do different materials affect the speed of sound?

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Sound travels at different speeds in different materials due to the density and elasticity of the material. For example, sound travels faster in wood than in air because the particles in wood are closer together.

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What is the effect of air resistance on falling objects?

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Air resistance is a force that opposes the motion of an object through the air. It affects lighter and more spread-out objects more than heavier and more compact objects, causing them to fall more slowly.

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NGSS.MS-PS3-5

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements chemically bond together, such as water (H2O), which is made of hydrogen and oxygen.

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NGSS.MS-PS1-1

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What is the law of conservation of mass?

Back

The law of conservation of mass states that mass cannot be created or destroyed in a chemical reaction. The total mass of the reactants equals the total mass of the products.

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NGSS.MS-PS1-5

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What is the difference between a mixture and a compound?

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A mixture is a combination of two or more substances that are not chemically bonded, while a compound is a substance formed from two or more elements that are chemically bonded.

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What happens to the mass of a sealed container during a chemical reaction?

Back

The mass of a sealed container remains constant during a chemical reaction, as long as no substances enter or leave the container.

Tags

NGSS.MS-PS1-5

Front

What is the role of gravity in falling objects?

Back

Gravity is a force that pulls objects toward the Earth. It affects all objects equally, but the effect of air resistance can cause lighter objects to fall more slowly.

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What is a pure substance?

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A pure substance is a material that has a constant composition and consistent properties throughout, such as elements and compounds.

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NGSS.MS-PS1-4

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What is a solution?

Back

A solution is a homogeneous mixture where one substance (the solute) is dissolved in another (the solvent), such as saltwater.