8th grade chemistry

Front

What classifies a substance as a mixture?

Back

A mixture is made up of two or more substances that are not chemically bonded.

Front

Why are noble gases such as helium (He) and neon (Ne) grouped together in the periodic table?

Back

Noble gases are grouped together because they are nonreactive gases.

Front

How many atoms are in one formula unit of the compound FeC5O5?

Back

There are 11 atoms in one formula unit of FeC5O5.

Front

Which elements are most likely to react in the same manner in a chemical reaction?

Back

Elements in the same group are most likely to react in the same manner.

Front

What properties are used to group metals in the periodic table?

Back

Properties such as magnetism, luster, and malleability are used to group metals.

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 of that element.

Front

What is a chemical bond?

Back

A chemical bond is a lasting attraction between atoms that enables the formation of chemical compounds.

Front

What is the difference between an ionic bond and a covalent bond?

Back

An ionic bond is formed when electrons are transferred from one atom to another, while a covalent bond is formed when atoms share electrons.

Front

What are the three states of matter?

Back

The three states of matter are solid, liquid, and gas.