Physical Science Final Exam Review

Front

How many valence electrons does lithium have?

Back

Lithium has 1 valence electron.

Front

What is half-life?

Back

Half-life is the amount of time needed for half of a radioactive sample to decay.

Front

What happens to the kinetic energy of water particles when the temperature increases from boiling?

Back

The kinetic energy of the particles speeds up and they move farther apart.

Front

What is the chemical formula for trisulfur pentafluoride?

Back

The formula for trisulfur pentafluoride is S3F5.

Front

What does it indicate if red litmus paper turns blue in a substance?

Back

It indicates that the substance is a base.

Front

Define valence electrons.

Back

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

Front

What is the significance of half-life in radioactive decay?

Back

Half-life helps determine the rate at which a radioactive substance decays and is crucial for dating materials.

Front

Explain the relationship between temperature and kinetic energy in particles.

Back

As temperature increases, the kinetic energy of particles increases, causing them to move faster and spread apart.

Front

What does the formula S3F5 represent in chemistry?

Back

S3F5 represents trisulfur pentafluoride, a chemical compound.

Front

What is the pH scale?

Back

The pH scale measures how acidic or basic a substance is, ranging from 0 (acidic) to 14 (basic), with 7 being neutral.