ADV Unit 2 MATTER pre-assessment

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element. It consists of protons, neutrons, and electrons.

Front

What do protons represent in an atom?

Back

Protons are positively charged particles found in the nucleus of an atom. They determine the atomic number and identity of an element.

Front

What do neutrons do in an atom?

Back

Neutrons are neutral particles found in the nucleus of an atom. They contribute to the atomic mass and stability of the nucleus.

Front

What is the charge of an electron?

Back

Electrons have a negative charge and are found in the electron cloud surrounding the nucleus of an atom.

Front

How does temperature affect the kinetic energy of molecules?

Back

As temperature increases, the average kinetic energy of molecules increases, causing them to move faster.

Front

What is the difference between a solid, liquid, and gas in terms of molecular arrangement?

Back

In solids, molecules are closely packed and vibrate in place. In liquids, molecules are close but can move past each other. In gases, molecules are far apart and move freely.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together, representing the smallest fundamental unit of a chemical compound.

Front

What is the significance of the electron cloud model?

Back

The electron cloud model illustrates the probable locations of electrons around the nucleus, showing areas where electrons are likely to be found.

Front

What is the role of the nucleus in an atom?

Back

The nucleus contains protons and neutrons and is the central part of an atom, holding most of its mass.

Front

What is the composition of Earth's atmosphere?

Back

Earth's atmosphere is primarily composed of nitrogen (78%), oxygen (21%), and trace amounts of other gases like carbon dioxide and hydrogen.