Chemistry Review

What is the smallest particle of matter that retains the properties of an element?

• Proton

• Molecule

• Atom

• Compound

Two reactants undergo a chemical reaction to form a new product. What type of substance is the product formed?

• A mixture

• An element

• An atom

• A compound

Which of the following is the best definition of an element?

• An element is a substance formed when a mixture is separated by physical means.

• An element is a substance that has the same properties in every sample.

• An element is a substance that contains only one type of atom.

• An element is a substance formed when molecules are broken down.

How many atoms are in HCl?

• 1

• 2

• 3

• 0

What do elements, compounds, and molecules all have in common?

• They are all solids.

• They are all chemically the same.

• All of them can be chemically broken down.

• They are all made of atoms.

In the periodic table, where are the most massive elements located?

• At the bottom.

• At the top

• On the far right

• On the far left

Which of these is the most reactive metal based upon its position on the periodic table?

• H

• F

• K

• Na

An element has the physical properties of being dense, hard, shiny, a conductor of electricity, and a high melting point. What type of matter is it most likely to be?

• Non-meta;

• Metal

• Metalloid

• Gas

Elements in the same vertical column in the periodic table have similar

• atomic symbols

• atomic numbers

• Number of neutrons

• chemical properties

When one substance floats on top of another it is because

• the substance on top is more dense

• the substance on top is less dense

• the volume is greater because there are two substances instead of one

• the particles of the substance on top are moving faster than the particles on the bottom