Q1W3 GC1 Chemical Formula & Naming

Open Ended

What is the difference between a molecule and an ion?

Multiple Choice

Which of the following is TRUE about H₂ and 2H?

• They are the same

• H₂ means there is 2 molecules of H.

• 2H means there are 2 atoms of H that are bonded.

• H₂ means there is only 1 molecule of a bonded H.

Multiple Choice

What chemical formula shows the actual number of atoms present?

• Structural Formula

• Molecular Formula

• Empirical Formula

• Condensed Formula

Multiple Choice

A molecule of metaldehyde (a pesticide used for snails and slugs) contains 8 carbon atoms, 16 hydrogen atoms, and 4 oxygen atoms. What is the empirical formulas of metaldehyde?

• CH₂O

• C₂H₄O

• C₄H₈O₂

• C₈H₁₆O₄

Multiple Choice

Benzene, C₆H₆, is produced during oil refining and has many industrial uses. Which of the following represents the structural formula of benzene?

Match

Match the following.

• Single bond

• Double bond

• Triple bond

Weakest bonding

Intermediate strength bonding

Strongest bonding

• Weakest bonding

• Intermediate strength bonding

• Strongest bonding

Multiple Choice

Which of the following describes an ion?

• contains charges

• can be a metal or nonmetal

• its bonds is created by transfer of electrons

• all of the choices

Match

Match the following elements involved in the following bonding

• Metallic

• Covalent

• Ionic

metal and metal

non-metal and non-metal

metal and non-metal

• metal and metal

• non-metal and non-metal

• metal and non-metal

Open Ended

What is the difference between covalent and ionic bonding in terms of the following?

1. electrons sharing/transfer

2. 2. types of elements involve (metals & non-metals)

3. 3. presence of charges

Match

Match the following numbers with their respective prefixes.

• deca-

• penta-

• hepta-

• nona-

• hexa-

10

5

7

9

6

• 10

• 5

• 7

• 9

• 6

Multiple Choice

What is the chemical formula for iodine pentafluoride?

• IF₃

• IF₅

• IF₇

• IF₉

Multiple Choice

What is the chemical name for the covalent compound P₄S₅?

• Hexaphosphorus hepasulfide

• Pentaphosphorus tetrasulfide

• Tetraphosphorus pentasulfide

• Tetrasulfur pentaphosphide

Multiple Choice

If chromium (II) with an ionic charge of +2 combines with fluoride with an ionic charge of -1, what is the chemical formula?

• CrF

• CrF₂

• Cr₂F

• Cr₂F₂

Multiple Choice

Which of the following pairs correctly matches the chemical formula with its chemical name?

• Al₂O₃ - aluminum oxide

• Ba₂Cl₂ - barium (II) chloride

• CaCO₃ - calcium carbide

• Cu₃N - copper nitride

Multiple Choice

The gemstone sapphire is mostly a compound of aluminum and oxygen that contains aluminum cations, Al³⁺, and oxygen anions, O²⁻. What is the formula of this compound?

• AlO

• Al₂O₃

• Al₃O₂

• Al₅O₅

Multiple Choice

Baking powder contains calcium dihydrogen phosphate, an ionic compound composed of the ions Ca²⁺ and H₂PO₄⁻.

What is the formula of this compound?

• CaHPO₂

• CaH₂PO₄

• Ca₂H₂PO₄

• Ca(H₂PO₄)₂

Multiple Choice

Predict the formula of the ionic compound formed between the lithium ion with a charge of +1 and the peroxide ion, O₂²⁻.

• LiO

• Li₂O₂

• 2LiO

• (LiO)₂