Flashcard 7A/7B Review

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together. For example, two oxygen atoms (O2) form a molecule.

Front

What taste is characteristic of acids?

Back

Acids typically taste sour.

Front

Have scientists always known exactly what an atom looks like?

Back

No, scientists' theories about the atom have changed over time.

Front

Who proposed that electrons move in specific circular paths around the nucleus?

Back

Niels Bohr proposed that electrons move in specific circular paths around the nucleus.

Front

What is produced when an acid and a base react?

Back

When an acid and a base react, they produce water and salt.

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms.

Front

What is the pH scale used for?

Back

The pH scale is used to measure how acidic or basic a solution is.

Front

What is a base?

Back

A base is a substance that can accept hydrogen ions (H+) or donate electron pairs in reactions.