Chemistry Basics

How many PROTONS are found in a potassium atom?

• 17

• 18

• 19

• 20

What is the role of electrons in an atom?

• Electrons are positively charged particles that orbit the nucleus of an atom.

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

• Electrons are neutral particles found in the nucleus of an atom.

• Electrons are particles that are responsible for the mass of an atom.

Anything that takes up space and has mass is known as _______________.

• Energy

• Matter

• Force

• Volume

What is the atomic number of an element?

• The number of neutrons in the nucleus of an atom.

• The number of protons in the nucleus of an atom, which determines the element's identity.

• The total number of electrons in an atom.

• The mass of an atom measured in atomic mass units.

What is a chemical reaction?

• A process that leads to the transformation of one set of chemical substances to another.

• A method of separating mixtures into their individual components.

• A technique used to measure the acidity or basicity of a solution.

• A way to combine different elements without changing their properties.

Neutrons have what charge?

• Positive charge

• Negative charge

• Neutral charge (no charge)

• Variable charge

What is the difference between an element and a compound?

• 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.

• An element can be broken down into simpler substances, while a compound cannot.

• An element is a mixture of different atoms, while a compound is a single type of atom.

• An element is always a solid, while a compound can be a solid, liquid, or gas.

What are molecules?

• Groups of two or more atoms bonded together, which can be of the same or different elements.

• Single atoms that exist independently in nature.

• Only compounds made of different elements.

• Atoms that are not chemically bonded.

What is the charge of a proton?

• Negative charge

• No charge

• Positive charge

• Neutral charge

What is the periodic table?

• A tabular arrangement of chemical elements organized by atomic number and properties.

• A list of all known chemical compounds.

• A graphical representation of chemical reactions.

• A collection of all known minerals and their properties.