Unit 2 Vocab (PS)

What is the action of bringing a liquid to the temperature at which it bubbles and turns to vapor?

• Freezing

• Condensation

• Boiling

• Evaporation

Answer explanation

The action of bringing a liquid to the temperature at which it bubbles and turns to vapor is called boiling. This process occurs when the liquid reaches its boiling point, resulting in the formation of vapor.

Tags

NGSS.MS-PS1-4

What always begins with a capital letter and is unique to each element?

• Chemical Symbol

• Compound

• Element

• Gas

Answer explanation

The correct answer is 'Chemical Symbol' because it always starts with a capital letter and is unique to each chemical element, representing it in a standardized way, unlike compounds or gases.

What is the phase change at which a liquid turns into a gas, occurring at the surface of a liquid?

• Freezing

• Evaporation

• Condensation

• Boiling

Answer explanation

The phase change where a liquid turns into a gas at the surface is called evaporation. This process occurs at any temperature below the boiling point, distinguishing it from boiling, which happens throughout the liquid.

Tags

NGSS.MS-PS1-4

What is the state of matter that has an indefinite shape but a definite volume?

• Solid

• Gas

• Liquid

• Plasma

Answer explanation

A liquid has a definite volume but takes the shape of its container, making its shape indefinite. In contrast, solids have a definite shape and volume, gases have neither, and plasma is an ionized state of matter.

At what temperature does a solid become a liquid?

• Boiling Point

• Freezing Point

• Melting Point

• Dew Point

Answer explanation

A solid becomes a liquid at its melting point, which is the specific temperature where the solid's structure breaks down. The boiling point refers to liquids turning into gases, while the freezing point is for liquids becoming solids.

Tags

NGSS.MS-PS1-4

What term describes a substance that can be dissolved in another?

• Insoluble

• Soluble

• Saturated

• Supersaturated

Answer explanation

The term 'soluble' describes a substance that can be dissolved in another. In contrast, 'insoluble' refers to substances that cannot dissolve, while 'saturated' and 'supersaturated' relate to solutions at specific concentrations.

What is the maximum amount of solute that can be dissolved in a given amount of solvent at a specific temperature called?

• Solubility

• Saturation

• Concentration

• Dilution

Answer explanation

The maximum amount of solute that can be dissolved in a solvent at a specific temperature is called solubility. It defines the limit of solute concentration in a solution before saturation occurs.

What is the substance called that gets dissolved in a solution?

• Solvent

• Solute

• Solution

• Mixture

Answer explanation

The substance that gets dissolved in a solution is called the solute. In contrast, the solvent is the substance that does the dissolving, while a solution is the mixture of solute and solvent.

What is a homogenous liquid mixture where the solute is dissolved into the solvent called?

• Suspension

• Colloid

• Solution

• Emulsion

Answer explanation

A homogenous liquid mixture where the solute is completely dissolved in the solvent is called a solution. In contrast, suspensions and colloids involve particles that do not fully dissolve, while emulsions are mixtures of two immiscible liquids.

What is the process called when a substance changes from a liquid to a gas with the addition of energy?

• Condensation

• Freezing

• Vaporization

• Sublimation

Answer explanation

The process of a substance changing from a liquid to a gas with the addition of energy is called vaporization. This occurs when molecules gain enough energy to overcome intermolecular forces, allowing them to escape into the gas phase.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4