Last Chemistry test study guide

Front

How many moles of carbon dioxide are produced when 6.3 mol of propane gas (C3H8) is burned in excess oxygen?

Back

18.9 mol (From the reaction: C3H8 + 5O2 → 3CO2 + 4H2O, 6.3 mol of C3H8 produces 18.9 mol of CO2).

Front

What type of bond is formed between Magnesium (Mg) and Oxygen (O)?

Back

Ionic bond (Magnesium donates electrons to Oxygen, forming an ionic bond).

Front

How many significant figures does the number 0.998005 have?

Back

6 significant figures (All non-zero digits and any zeros between them are significant).

Front

Convert 2.5 hours to seconds.

Back

9000 seconds (2.5 hours × 3600 seconds/hour = 9000 seconds).

Front

Why do chemists use an excess of one reactant in a chemical reaction?

Back

To ensure the reaction continues until all of the limiting reactant is consumed.

Front

What is the molar mass of propane (C3H8)?

Back

44.1 g/mol (Calculated as: 3(12.01 g/mol for C) + 8(1.008 g/mol for H)).

Front

Define a limiting reactant in a chemical reaction.

Back

The reactant that is completely consumed first, limiting the amount of product formed.

Front

What is the formula for calculating moles from mass?

Back

Moles = Mass (g) / Molar Mass (g/mol).

Front

What is the difference between ionic and covalent bonds?

Back

Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.

Front

How do you determine the number of significant figures in a measurement?

Back

Count all non-zero digits, any zeros between them, and trailing zeros only if there is a decimal point.