Honors Chemistry Midterm

Front

What is the atomic mass on the periodic table?

Back

The atomic mass is an average of all the isotopes of an element based on their abundance.

Front

How many bonds will an element form in a covalent compound?

Back

The number of bonds is equal to the number of electrons needed to reach an octet.

Front

Do Aluminum-27 and an atom with 14 protons and 13 neutrons belong to the same element?

Back

No, because they have different numbers of protons.

Front

What discovery was made from experiments with cathode rays?

Back

The discovery of electrons.

Front

Convert 35,400 mg to grams.

Back

35,400 mg = 35.4 g.

Front

What are isotopes?

Back

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.

Front

What is the octet rule?

Back

The octet rule states that atoms tend to form bonds until they are surrounded by eight valence electrons.

Front

What is a covalent bond?

Back

A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms.

Front

What is the significance of valence electrons?

Back

Valence electrons determine how an element will react chemically and how many bonds it can form.

Front

What is the difference between protons and neutrons?

Back

Protons are positively charged particles found in the nucleus, while neutrons are neutral particles also found in the nucleus.