Chemistry Final Exam Review

Front

What is atomic mass?

Back

The atomic mass of an element is the weighted average mass of the atoms in a naturally occurring sample of the element, typically measured in atomic mass units (amu). It is calculated by adding the number of protons and neutrons in the nucleus.

Front

How do you determine the atomic mass of an element with 11 protons and 12 neutrons?

Back

Add the number of protons (11) and neutrons (12) together: 11 + 12 = 23. Therefore, the atomic mass is 23.

Front

What is a Lewis dot structure?

Back

A Lewis dot structure is a diagram that shows the bonding between atoms of a molecule and the lone pairs of electrons that may exist in the molecule.

Front

What is the correct Lewis dot structure for Chlorine?

Back

The correct Lewis dot structure for Chlorine has 7 valence electrons represented as dots around the symbol Cl.

Front

What are the characteristics of a liquid?

Back

A liquid has a definite volume but takes the shape of its container. It has weight and flows easily.

Front

In a chemical reaction, what are the products?

Back

Products are the substances that are formed as a result of a chemical reaction, located to the right of the arrow in a chemical equation.

Front

What is matter?

Back

Matter is anything that has mass and takes up space.

Front

What is the difference between reactants and products in a chemical reaction?

Back

Reactants are the starting substances that undergo a chemical change, while products are the substances formed as a result of the reaction.

Front

What is the definition of an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means and is made up of atoms that all have the same number of protons.

Front

What is the significance of protons in an atom?

Back

Protons determine the atomic number of an element and its identity. They are positively charged particles found in the nucleus of an atom.