Chemistry Final Exam Review

Front

What are alkali metals characterized by?

Back

Alkali metals have 1 valence electron and a +1 charge.

Front

What is the electron configuration for Arsenic?

Back

1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p³.

Front

What is an example of a physical change?

Back

Shredding paper is an example of a physical change.

Front

What is an example of a chemical change?

Back

Rusting iron is an example of a chemical change.

Front

How many atoms of iodine are in a mole of iodine?

Back

6.02 x 10²³ atoms.

Front

What is the charge of alkali metals when they form ions?

Back

Alkali metals typically form +1 ions.

Front

What distinguishes a physical change from a chemical change?

Back

A physical change does not alter the chemical composition of a substance, while a chemical change does.

Front

What is the significance of the number 6.02 x 10²³ in chemistry?

Back

It is known as Avogadro's number, representing the number of atoms or molecules in one mole of a substance.

Front

What is the general trend in reactivity for alkali metals?

Back

Reactivity increases as you move down the group in the periodic table.

Front

What does the term 'valence electron' refer to?

Back

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