PS9 Chemistry Final Prep

Front

What determines how atoms will combine to form molecules?

Back

Electrons are responsible for the chemical bonding between atoms, as they are involved in the formation of bonds.

Front

What is the mass number of an atom?

Back

The mass number is the total number of protons and neutrons in the nucleus of an atom.

Front

How do you calculate the mass of an element with protons, electrons, and neutrons?

Back

Mass = Number of Protons + Number of Neutrons. For example, an element with 83 protons and 126 neutrons has a mass of 209.

Front

What effect does cooling gases have on a chemical reaction?

Back

Cooling gases slows down the reaction rate by reducing the energy and movement of the molecules.

Front

What are vertical columns in the periodic table called?

Back

Vertical columns are called Groups (or Families), which contain elements with similar properties.

Front

What is the role of protons in an atom?

Back

Protons determine the atomic number and identity of an element.

Front

What is the role of neutrons in an atom?

Back

Neutrons contribute to the mass of an atom and help stabilize the nucleus.

Front

What is an ion?

Back

An ion is an atom or molecule that has gained or lost one or more electrons, resulting in a net charge.

Front

What is a chemical bond?

Back

A chemical bond is the force that holds atoms together in a molecule, formed by the sharing or transfer of electrons.

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 chemically bonded together.