NC Check In: Physical Science Review

What is density?

• The mass of an object divided by its volume, often used to determine whether an object will float or sink.

• The weight of an object divided by its height.

• The volume of an object divided by its mass.

• The total mass of an object regardless of its volume.

What happens to water molecules when heated?

• They absorb heat, move faster, and move farther apart, leading to a change from liquid to gas.

• They lose heat and become more compact, remaining in liquid form.

• They remain stationary and do not change state.

• They freeze and become solid, losing all movement.

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What is kinetic energy?

• The energy an object possesses due to its motion, which increases with speed.

• The energy stored in an object due to its position or state.

• The energy released during a chemical reaction.

• The energy associated with the temperature of an object.

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What is the role of heat in phase changes?

• Heat energy is absorbed or released during phase changes, affecting the arrangement and movement of molecules.

• Heat causes all molecules to stop moving during phase changes.

• Heat has no effect on phase changes; only pressure matters.

• Heat energy is only released during phase changes, not absorbed.

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What are the environmental impacts of hydroelectric power?

• Increased air pollution from fossil fuels

• Potential ecosystem damage and loss of land due to dam construction and water diversion.

• Improved water quality in nearby rivers

• Enhanced biodiversity in aquatic habitats

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

• A physical change alters the form of a substance without changing its identity, while a chemical change results in the formation of new substances.

• A physical change involves the creation of new substances, while a chemical change does not affect the substance's identity.

• A physical change is reversible, while a chemical change is always irreversible.

• A physical change occurs at the molecular level, while a chemical change occurs only at the atomic level.

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What is thermal energy?

• The energy produced by chemical reactions in an object.

• The total energy of all the particles in an object, related to temperature and heat transfer.

• The energy stored in the bonds of molecules.

• The energy associated with the motion of an object.

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What is a disadvantage of wind turbines?

• They can only be used in urban areas.

• They are efficient only in certain areas, which can limit their effectiveness.

• They require a large amount of water for operation.

• They produce noise pollution that affects wildlife.

What are the advantages of wind energy?

• Wind energy is non-renewable and contributes to greenhouse gas emissions.

• Wind energy is renewable, reduces greenhouse gas emissions, and can be harnessed in various locations.

• Wind energy is only effective in coastal areas and is expensive to implement.

• Wind energy requires fossil fuels for production and is not environmentally friendly.

What is the significance of renewable energy sources?

• They are non-sustainable and increase reliance on fossil fuels.

• They help reduce reliance on fossil fuels, minimizing environmental impact.

• They are more expensive than fossil fuels and less efficient.

• They are only available in certain geographic locations.

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