Chemistry Unit Review - Part 1: 8.P.1.1

The table shows the chemical formulas for several common substances.

Which two elements make up household ammonia?

• Neon and helium

• Neon and hydrogen

• Nitrogen and helium

• Nitrogen and hydrogen

The table shows common compounds and their chemical formulas.

Which can BEST be concluded from this information?

• Some compounds contain only one element.

• All compounds contain the same number of elements.

• Elements combine in many ways to form different compounds.

• Elements combine in the same way to form different compounds.

Which is an example of a mixture?

• sodium chloride

• fruit punch

• water

Which element is a liquid at room temperature?

• aluminum

• mercury

• copper

Which substance is composed of only one type of atom?

• element

• mixture

• solution

Which is the BEST description of one particle of table salt (NaCl)?

• atom

• compound

• element

How are elements arranged on the periodic table?

• by mass, from lowest to highest

• by number of protons, from lowest to highest

• by date of discovery or creation, from oldest to newest

What is the relationship between elements with 6, 14, and 82 protons in their nuclei on the periodic table of elements?

• They are in the same group.

• They are in the same period.

• They have the same atomic mass.

If a highly-reactive metal with one valence electron is discovered, in which group would the element BEST fit?

• Group 1

• Group 2

• Group 6

Chemical formulas for several common substances are listed in the table shown.

Why does hydrogen (H) have a different subscript in each substance?

• The subscript indicates the number of hydrogen atoms in each substance.

• The subscript indicates the number of mixtures that the hydrogen is forming.

• The subscript indicates the number of compounds that the hydrogen is forming.

• The subscript indicates whether the hydrogen is forming a compound or a mixture.