Chem Exam Review 1st Semester 24-25

Front

What is a mixture?

Back

A mixture is two or more substances together, but not chemically combined.

Front

True or False: The carbon group on the periodic table always gains 4 electrons when bonding.

Back

False

Front

What is the electron configuration for Oxygen?

Back

1s² 2s² 2p⁴

Front

How many more electrons does Oxygen need to satisfy the octet rule?

Back

Oxygen needs 2 more electrons to satisfy the octet rule.

Front

True or False: The electron configuration for Iron is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁶.

Back

True

Front

What is the formula for density?

Back

Density = Mass / Volume

Front

If an unknown compound has a volume of 20 cm³ and a mass of 40 grams, what is its density?

Back

The density is 2 g/cm³.

Front

Define a compound.

Back

A compound is a substance formed when two or more elements are chemically bonded together.

Front

What is the octet rule?

Back

The octet rule states that atoms tend to bond in such a way that they have eight electrons in their valence shell.

Front

What is the significance of the periodic table?

Back

The periodic table organizes elements based on their atomic number, electron configurations, and recurring chemical properties.