Science Midterm Exam Review 2024

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What is a metal?

Back

A metal is a type of element that is typically shiny, malleable, ductile, and a good conductor of heat and electricity. Metals are usually solid at room temperature (except for mercury) and can be found on the left side and in the center of the periodic table.

Front

What is density?

Back

Density is a measure of how much mass is contained in a given volume. It is calculated by dividing mass by volume (Density = Mass/Volume). Objects with a density greater than water (1 g/cm³) will sink, while those with a lower density will float.

Front

What is Newton's Third Law of Motion?

Back

Newton's Third Law states that for every action, there is an equal and opposite reaction. This means that when one object exerts a force on another object, the second object exerts a force of equal strength in the opposite direction on the first object.

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What are balanced forces?

Back

Balanced forces are forces that are equal in size but opposite in direction. When forces are balanced, they do not cause a change in the motion of an object.

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What are unbalanced forces?

Back

Unbalanced forces occur when one force is greater than another, causing a change in the motion of an object. This can result in acceleration, deceleration, or a change in direction.

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What is a heterogeneous mixture?

Back

A heterogeneous mixture is a type of mixture where the components are not uniformly distributed, and different parts can be easily distinguished. Examples include salad, mixed nuts, and sand.

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What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture in which the components are evenly distributed and cannot be easily distinguished. Examples include saltwater and air.

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What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout. It can be an element or a compound.

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What is a compound?

Back

A compound is a substance formed when two or more elements chemically bond together in a fixed ratio. Examples include water (H2O) and carbon dioxide (CO2).

Front

What is the role of force in motion?

Back

Force is a push or pull that can cause an object to move, stop, or change direction. The net force acting on an object determines its motion.