Final Exam Review

A model of Helium (He) atom is shown. Which numbered part of helium atom represents a proton?

• Green

• Red

When using the Periodic Table, the easiest way to determine how many protons exist in an atom of an element is to look at  what?

• the element's atomic mass

• the element's atomic number

• the element's group number

• the element's period number

A student sees a diagram in a textbook. What does the symbol in the diagram represent?

• a compound

• a molecule

• an element

• an isotope

What three elements are in the same family as iron (Fe)?

• oxygen (O), helium (He), and aluminum (Al)

• potassium (K), calcium (Ca), and copper (Cu)

• ruthenium (Ru), osmium (Os), and hassium (Hs)

• chromium (Cr), manganese (Mn), and cobalt (Co)

What makes up a compound?

• two or more types of cells chemically combined

• two or more types of cells physically combined

• two or more types of elements chemically combined

• two or more types of elements physically combined

In the reaction shown below, iron reacts with water to form iron oxide and hydrogen gas. Which of the terms below BEST describes the iron (Fe) reactant?

• molecule

• ion

• compound

• element

The chemical formula below is an example of: NaCl (Table Salt)

• a crystal

• an covalent molecule

• a metallic compound

• an ionic compound

Subscripts in a chemical formula show how many of each kind of atom are in the compound.

• True

• False

• Maybe

• IDK

If you stir together the two compounds below, what have you made?

• sugar water

• water carbonate

• carbon hydroxide

• salt water

Baking soda is the common name for the chemical sodium bicarbonate. The chemical formula for sodium bicarbonate is listed below. How many different elements are found in this compound?

NaHCO3

• 5

• 4

• 6

• 1