Naming Compounds
Word Equations
Chemical Formulae
GFM (Gram Formula Mass)
100

What two elements form the compound magnesium chloride?

Magnesium and chlorine

100

In a reaction where carbon and oxygen react to form carbon dioxide, what are the reactants and what is the product?

Reactants: Carbon and oxygen 

Product: Carbon dioxide 

100

How many atoms are in a diatomic molecule, and what are the names of the seven diatomic elements?

A diatomic molecule contains 2 atoms.

The seven diatomic elements are: Chlorine, Fluorine, Bromine, Iodine, Oxygen, Nitrogen, Hydrogen.

100

What unit is used for the gram formula mass of a substance?

Formula mass can be expressed in grams per mole (abbreviated as g/mol).

200

What compound is formed when iron and sulfur combine?

Iron sulfide.

200

Write a word equation for the reaction where hydrogen gas burns in oxygen gas to produce water.

Hydrogen + oxygen → water

200

Using the prefixes in their names, write the chemical formulae for: a) Carbon monoxide b) Sulfur dioxide c) Carbon tetrafluoride

  • a) CO (mon = 1 oxygen)

  • b) SO2 (di = 2 oxygens)

  • c) CF4 (tetra = 4 fluorines)

200

Using a periodic table, calculate the formula mass of water (H2O) in g/mol.  

  • H: 2 x 1 = 2 g/mol

  • O: 1 x 16 = 16 g/mol

  • Total Formula Mass: 18 g/mol

300

Based on its name, how many elements are in magnesium sulfide, and what are they?

There are two total elements present: magnesium and sulfur (indicated by the ‘-ide’ ending).

300

When solid magnesium is dropped into hydrochloric acid, it bubbles to release hydrogen gas and leaves behind a solution of magnesium chloride. Write the complete word equation for this reaction.

Magnesium + hydrochloric acid → magnesium chloride + hydrogen

300

Use the SVSDF (Symbol, Valency, Swap, Divide, Formula) method to work out the formula for aluminum oxide.  

  • Symbol: Al        O

  • Valency: 3         2

  • Swap: 2       3

  • Divide: 2      3 (cannot simplify further)

  • Formula: Al2O3

300

Calculate the formula mass in g/mol for carbon dioxide (CO2) and methane (CH4). Which substance has a higher formula mass?

  • Carbon dioxide (CO2):

    • C: 1 x 12 = 12 g/mol

    • O: 2 x 16 = 32 g/mol

    • Total: 44 g/mol

  • Methane (CH4):

    • C: 1 x 12 = 12 g/mol

    • H: 4 x 1 = 4 g/mol

    • Total: 16 g/mol

400

You burn magnesium ribbon to form a white powder. What is the name of this white powder?

magnesium oxide

400

Rust forms when iron metal reacts with both oxygen gas and water to yield hydrated iron oxide. Write the full word equation for rusting.

Iron + oxygen + water → iron oxide

400

Use the SVSDF method to write the chemical formula for iron(III) oxide. What does the Roman numeral (III) tell you about the iron ion?

Formula:

  • Symbol: Fe            O

  • Valency: 3            2

  • Swap: 2          3

  • Divide: 2           3

  • Formula: Fe2O3

400

Calculate the formula mass of calcium hydroxide, Ca(OH)2, in g/mol. Be careful with the brackets!

  • Ca: 1 x 40 = 40 g/mol

  • O: 2 x 16 = 32 g/mol

  • H: 2 x 1 = 2 g/mol

  • Total Formula Mass: 74 g/mol

500

What compound would form when nitrogen, oxygen and lithium combine?

lithium nitrate

500

A student writes the following statement: "Thermal decomposition occurs when solid calcium carbonate is heated, breaking down into solid calcium oxide and carbon dioxide gas." Convert this statement into a word equation.

Calcium carbonate → calcium oxide + carbon dioxide

500

Use SVSDF to find the formula for lead(IV) oxide.

Lead(IV) oxide:

  • Symbol: Pb       O

  • Valency: 4        2

  • Swap: 2          4

  • Divide: 1         2 (divided both by 2)

  • Formula: PbO2

500

Calculate the GFM for aluminum sulfate, Al2(SO4)3  in g/mol.

  • Aluminum (Al): 2 x 27 = 54 g/mol

  • Sulfur (S): 3 x 32 = 96 g/mol (3 sulfurs total)

  • Oxygen (O): 12 x 16 = 192 g/mol (12 oxygens total)

  • Total Formula Mass: 54 + 96 + 192 = 342 g/mol

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