Chemistry Mid Term Review

Front

What subatomic particles are found in the nucleus of an atom?

Back

Protons and neutrons.

Front

How many neutrons are in an atom with an atomic mass of 235 and an atomic number of 92?

Back

143 neutrons.

Front

In a controlled experiment, how many variables should be tested or changed?

Back

1 variable.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What charge does an atom have when it gains electrons?

Back

Negative charge.

Front

What is the charge of a proton?

Back

Positive charge.

Front

What is the charge of an electron?

Back

Negative charge.

Front

What is the definition of an isotope?

Back

Atoms of the same element with different numbers of neutrons.

Front

What is the significance of the atomic number in the periodic table?

Back

It determines the element's identity and its position in the periodic table.

Front

What is the difference between a covalent bond and an ionic bond?

Back

Covalent bonds involve sharing electrons, while ionic bonds involve transferring electrons.