Sem 1 Final Exam Physical Science Review 2425 English

Front

What is the solar system model in atomic theory?

Back

In the solar system model, electrons are likened to planets orbiting around the nucleus, which is compared to the sun.

Front

What happens to the reactivity of alkali metals as you move down Group 1 in the Periodic Table?

Back

The single valence electron becomes more weakly pulled by the nucleus, increasing reactivity.

Front

How is the number of protons in an atom determined?

Back

The number of protons in an atom is determined by its atomic number.

Front

Are boiling and evaporation forms of vaporization?

Back

True, both boiling and evaporation are forms of vaporization.

Front

What occurs when a substance is freezing?

Back

When a substance is freezing, it is changing from a liquid to a solid, losing thermal energy, and the particles are forming bonds.

Front

What is the definition of an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.

Front

What is the atomic number?

Back

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

Front

What is the difference between boiling and evaporation?

Back

Boiling occurs at a specific temperature throughout the liquid, while evaporation can occur at any temperature and only at the surface.

Front

What are alkali metals?

Back

Alkali metals are the elements in Group 1 of the Periodic Table, known for their high reactivity and having one valence electron.

Front

What is vaporization?

Back

Vaporization is the process of turning from liquid into vapor, which includes both boiling and evaporation.