Midterm Review

Front

What are diatomic elements?

Back

Diatomic elements are molecules composed of two atoms of the same element, such as O2 (oxygen) and N2 (nitrogen).

Front

What particle in an atom has no charge?

Back

The neutron is the particle in an atom that has no charge.

Front

What process occurs in the core of main sequence stars like the sun?

Back

Main sequence stars, such as the sun, are fusing hydrogen (H) into helium (He) in their core.

Front

Is sodium (Na) an element or a mixture?

Back

Sodium (Na) is considered an element.

Front

Which of the following is an element: Carbon dioxide, Helium, Water, Sand, Iron oxide?

Back

Helium is an element.

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.

Front

What is the atomic number of an element?

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 difference between an element and a compound?

Back

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

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.

Front

What is the role of electrons in an atom?

Back

Electrons are negatively charged particles that orbit the nucleus of an atom and are involved in chemical bonding.