Chemistry Final Exam

Front

What is the correct name for the covalent compound PCl_5?

Back

Phosphorus pentachloride.

Front

What is the mass number of an atom with 6 protons and 8 neutrons?

Back

14.

Front

What is the mass number of an atom with 3 protons and 4 neutrons?

Back

7.

Front

How is the covalent compound N_2O named?

Back

Dinitrogen monoxide.

Front

What is the formula to calculate the number of formula units in moles?

Back

Number of formula units = moles × Avogadro's number (6.022 x 10^23).

Front

Define mass number.

Back

The mass number is the total number of protons and neutrons in an atom's nucleus.

Front

What is Avogadro's number?

Back

Avogadro's number is 6.022 x 10^23, representing the number of particles in one mole of a substance.

Front

What is a covalent bond?

Back

A covalent bond is a chemical bond formed by the sharing of electron pairs between atoms.

Front

What is the difference between ionic and covalent compounds?

Back

Ionic compounds are formed by the transfer of electrons, while covalent compounds are formed by the sharing of electrons.

Front

What is the significance of the prefix 'di-' in chemical nomenclature?

Back

The prefix 'di-' indicates that there are two atoms of the element in the compound.