Semester 1 Final Exam

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.

Front

What are valence electrons?

Back

Valence electrons are the electrons located in the outermost energy level of an atom. They are important for determining how an atom will bond with other atoms.

Front

Where is maximum potential energy on a roller coaster?

Back

Maximum potential energy is found at the top of a big hill on a roller coaster.

Front

What is the conversion of energy in glow sticks?

Back

The light produced by glow sticks is a conversion from chemical energy to radiant energy.

Front

What is energy?

Back

Energy is the ability to do work or cause change. It exists in various forms, including kinetic, potential, thermal, and chemical energy.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that involves the rearrangement of the molecular or ionic structure of a substance, resulting in the formation of new substances.

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 the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; it is conserved.

Front

What are the three states of matter?

Back

The three states of matter are solid, liquid, and gas. Each state has distinct properties based on the arrangement and energy of its particles.

Front

What is an example of a physical change?

Back

An example of a physical change is melting ice into water. The substance changes form but remains the same substance.