Unit 1 Exam Review (24-25)

Which state of matter has a definite shape and volume?

• Gas

• Liquid

• Plasma

• Solid

Answer explanation

A solid has a definite shape and volume, unlike gases and liquids which take the shape of their container. Plasma is an ionized state of matter and does not have a definite shape or volume either.

What determines the kinetic energy of a molecule?

• Temperature

• Shape

• Color

• Size

Answer explanation

The kinetic energy of a molecule is primarily determined by its temperature. As temperature increases, the average kinetic energy of the molecules also increases, leading to faster movement.

Which change occurs when ice is melting?

• Chemical Change

• Physical Change

• Phase Change

• None of the above

Answer explanation

When ice melts, it changes from solid to liquid without altering its chemical composition. This process is a phase change, specifically from the solid phase (ice) to the liquid phase (water).

What state of matter has a definite volume, but not a definite shape?

• Liquids

• Plasmas

• Gases

• Solids

Answer explanation

Liquids have a definite volume, meaning they occupy a fixed amount of space, but they do not have a definite shape, as they take the shape of their container. This distinguishes them from solids, which have both definite volume and shape.

Which type of property involves a change in the identity of a substance when observed?

• Physical Property

• Quantum Property

• Chemical Property

• Molecular Property

Answer explanation

A chemical property involves a change in the identity of a substance, such as during a chemical reaction. In contrast, physical properties do not alter the substance's identity.

What is the process called when a substance changes from a liquid state to a gas state?

• Condensation

• Sublimation

• Evaporation

• Deposition

Answer explanation

The process of a substance changing from a liquid to a gas is called evaporation. This occurs when molecules in the liquid gain enough energy to enter the gas phase, unlike condensation, which is the reverse process.

Match the state of matter to its description.

• Has definite shape and volume

• Liquid

• Definite volume but no definite shape

• Gas

• Neither definite shape nor volume

• Solid

Match the classification to whether it is a chemical or physical property.

• Physical Property

• Toxicity

• Chemical Property

• Density

• Physical Property

• Color

• Physical Property

• Flammability

• Chemical Property

• Boiling Point

Match the term to its corresponding definition in terms of kinetic molecular theory.

• Mass of an object divided by its volume

• Kinetic Energy

• Measurement of the heat of an object

• Temperature

• Energy an object has based on its motion

• Density

Match the phase change to its description.

• Solid to liquid

• Deposition

• Solid to gas

• Sublimation

• Gas to liquid

• Melting

• Gas to solid

• Freezing

• Liquid to solid

• Condensation