Science Midterm Exam Review 2024

Front

What is a liquid?

Back

A liquid is a state of matter that has a definite volume but no definite shape. It takes the shape of its container.

Front

What evidence indicates a chemical change has occurred?

Back

Evidence of a chemical change includes production of a precipitate, unexpected change in color, production of a gas, or change in thermal energy.

Front

What force keeps planets in orbit around the Sun?

Back

Gravity is the force that keeps the planets in our solar system orbiting the Sun.

Front

What happens to objects that are less dense than water?

Back

Objects that are less dense than water will float.

Front

What is elastic potential energy?

Back

Elastic potential energy is the energy stored in an object when it is compressed or stretched.

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What is density?

Back

Density is the mass of an object divided by its volume, often expressed in grams per cubic centimeter (g/cm³).

Front

What is the difference between physical and chemical changes?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What is the role of thermal energy in chemical reactions?

Back

Thermal energy can affect the rate of chemical reactions; an increase in thermal energy usually increases reaction rates.

Front

What is buoyancy?

Back

Buoyancy is the ability of an object to float in a fluid, determined by the object's density compared to the fluid's density.