Physical Science 1st Semester Review

Front

What is condensation?

Back

Condensation is the process by which water vapor in the air cools and changes into liquid water, forming droplets. An example is the water droplets on a cold glass on a hot day.

Front

Convert 117 cm to dm.

Back

117 cm = 11.7 dm.

Front

Convert 1,221 km to m.

Back

1,221 km = 1,221,000 m.

Front

What are valence electrons?

Back

Valence electrons are the outermost electrons of an atom that are involved in chemical bonding.

Front

How many electrons are shared in a single bond?

Back

A single bond indicates that 2 electrons are shared between two atoms.

Front

What is the difference between boiling and evaporation?

Back

Boiling is the rapid vaporization of a liquid at its boiling point, while evaporation is the slow process of liquid turning into vapor at any temperature.

Front

What is sublimation?

Back

Sublimation is the process where a solid changes directly into a gas without passing through the liquid state, such as dry ice turning into carbon dioxide gas.

Front

Define the term 'mass'.

Back

Mass is a measure of the amount of matter in an object, typically measured in grams or kilograms.

Front

What is the formula for calculating density?

Back

Density = Mass/Volume.

Front

What is the significance of the atomic number?

Back

The atomic number indicates the number of protons in the nucleus of an atom, which determines the element's identity.