Honors Chemistry Mid-term Exam

Front

What is an isotope?

Back

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.

Front

What is the atomic number?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is the bond angle in a trigonal planar molecule?

Back

The bond angle in a trigonal planar molecule is 120 degrees.

Front

Who is known for the gold foil experiment?

Back

Ernest Rutherford is known for the gold foil experiment, which led to the discovery of the atomic nucleus.

Front

What happens to atomic radius as you move across a period?

Back

The atomic radius decreases as you move left to right across a period due to increased nuclear charge.

Front

What are pure substances?

Back

Pure substances are materials that have a constant composition and consistent properties throughout.

Front

What are mixtures?

Back

Mixtures are combinations of two or more substances that retain their individual properties and can be separated by physical means.

Front

What is the difference between an atom and a molecule?

Back

An atom is the smallest unit of an element, while a molecule is a group of two or more atoms bonded together.

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 significance of the periodic table?

Back

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