Bab 3

Acetone, C₃H₆O, is the main component of fingernail polish remover. What is the molar mass of acetone ?

• 29 g/mol

• 48 g/mol

• 58 g/mol

• 34 g/mol

Chalk is mostly made of calcium carbonate, CaCO₃. If it took 48.6 g of chalk to write your name on the sidewalk, how many moles of calcium carbonate does your name contain?

• 0.486 mol

• 1.40 mol

• 0.714 mol

• 2.06 mol

Identify the number of Chlorine atoms in 65.8 g CaCl_2.

• 7.14 x 10²³ atoms

• 1.22 x 10²³ atoms

• 8.71 x 10²³ atoms

• 3.57 x 10²³ atoms

An empirical formula is defined as _______?

• The simplest whole number ratio of atoms in a formula.

• The formula showing the ratio of atoms in a formula.

• The actual whole number ratio of atoms in a formula.

The molecular formula for a carbon and hydrogen compound is C₈H₁₈. What is the empirical formula?

• C₈H₁₈

• C₁₈H₈

• C₉H₄

• C₄H₉

Which symbol shows a chemical reaction has occured?

• A

• B

• C

• D

In a word equation the REACTANTS

• Are written on the right hand side of the arrow

• Are always the same

• Are produced in a chemical reaction

• Are written on the left hand side of the arrow

Identify the product(s) in this word equation

• Sodium and sodium chloride

• Sodium

• Sodium and Chlorine

• Sodium chloride

How many Aluminum are in Al₂O₃?

• 3

• 5

• 2

• 1

Is this equation balanced?

• Yes

• No