Semester 1 Final Exam Chem Review

Front

What is molar mass and its unit?

Back

Molar mass is the mass of one mole of a substance, measured in grams/mole.

Front

How can you determine if a molecule is polar or non-polar?

Back

A molecule is polar if it has a net dipole moment due to the presence of polar bonds and an asymmetrical shape; otherwise, it is non-polar.

Front

What are the two units used when converting moles to grams?

Back

The two units are moles (mol) and grams.

Front

How many atoms are in 1 mole of any substance?

Back

1 mole of any substance contains 6.022 x 10^23 atoms (Avogadro's number).

Front

What is the mass of 1 mole of oxygen gas (O2)?

Back

The mass of 1 mole of oxygen gas (O2) is 32.0 grams.

Front

What is the formula to calculate the number of moles from mass?

Back

Number of moles = mass (g) / molar mass (g/mol).

Front

What is the significance of Avogadro's number in chemistry?

Back

Avogadro's number (6.022 x 10^23) allows chemists to count particles (atoms, molecules) in a sample by relating it to the amount in moles.

Front

How do you convert grams to moles?

Back

To convert grams to moles, divide the mass in grams by the molar mass of the substance.

Front

What is the difference between a polar and non-polar bond?

Back

A polar bond occurs when there is an unequal sharing of electrons between atoms, while a non-polar bond involves equal sharing.

Front

What is the molar mass of water (H2O)?

Back

The molar mass of water (H2O) is approximately 18.0 g/mol.