Names and Formulas of Compounds

An unknown sample of rock if found to contain very large, perfectly formed pink crystals in the shape of cubes. If the unknown crystals turned out to be a pure substance, which the following would most likely be true?
1. The unknown substance would be an ionic compound, since the ions will line up and form perfect crystals like this if possible
2. The unknown substance would be an ionic compound, since the lighter colours are often associated with ionic compounds
3. The unknown substance would be a covalent compound, since the shared bonding electrons in the valence shells make the compound appear shiny
4. The unknown substance would be a covalent compound, since covalent compounds generally form at lower temperatures
A compound forms between magnesium and bromine. Which of the following statements would be true?
1. The compound that forms would be ionic, its name would be magnesium bromide, and its chemical formula would be MgBr₂
2. The compound that forms would be ionic, its name would be magnesium bromide, and its chemical formula would be MgBr
3. The compound that forms would be covalent, its name would be magnesium dibromide, and its chemical formula would be MgBr₂
4. The compound that forms would be covalent, its name would be magnesium bromide, and its chemical formula would be MgBr
Examine the following compound: Mn₂O₃. Which of the following statements is true?
1. The name of this ionic compound is manganese (III) oxide
2. The name of this covalent compound is manganese (III) oxide
3. The name of this ionic compound is manganese oxide
4. The name of this covalent compound is nitrogen trioxide
What is the name if the ClO₂^– polyatomic ion?
1. Chlorite
2. Chlorate
3. Chloride
4. Chromate
What is the name of the following covalent compound: Se₃O₇?
1. Triselenium heptoxide
2. Selenium oxide
3. Selenium heptoxide
4. Triselenium oxide
CuSO₄ is an ionic compound that is used for a variety of tasks. It can be sprayed on fruits to control fungus growth, it can be mixed in solutions to test for proteins and sugars, and it burns a bright blue-green.

What is the chemical name for CuSO₄?
1. Copper (II) sulphate
2. Copper sulphur oxide
3. Copper sulphate
4. Copper (I) sulphate
You are told that a compound is formed between cobalt and another element. Which of the following statements is true?
1. Cobalt forms only ionic compounds, and cobalt is a multivalent metal with both Co²⁺ and Co³⁺ ions
2. Cobalt forms only ionic compounds, and cobalt forms a Co²⁺ ion
3. Cobalt forms both covalent and ionic compounds with all other
4. Cobalt forms both covalent and ionic compounds with non-metal elements
What is the name of the compound (NH₄)₃PO₃? Why is special about this compound?
1. Ammonium phosphite; this ionic compound is made up of two polyatomic ions, ammonium and phosphite
2. Ammonium phosphate; this ionic compound is made up of two polyatomic ions, ammonium and phosphate
3. Ammonium phosphite; this covalent compound is made up of two polyatomic ions, ammonium and phosphite
4. Ammonium phosphate; this covalent compound is made up of two polyatomic ions, ammonium and phosphate
CH₄ = methane
NH₃ = ammonia
C₆H₁₂O₆ = glucose
H₂O = water

Why are the binary covalent compounds CH₄, NH₃, C₆H₁₂O₆ and H₂O special?
1. Their naming is different from the usual method of naming binary covalent compounds, as they were discovered before a naming system was developed
2. All four compounds can be classified as either ionic or covalent, depending on the temperature
3. None of these covalent compounds can be created in a chemistry lab. Each is formed naturally
4. Each compound contains a polyatomic ion that behaves like a non-metal, as it shares electrons instead of transferring them
Scandium and nitrogen form an ionic compound. Which of the following statements is true?
1. The compound they form is ScN. Ionic compounds are written with the smallest whole number ratio
2. The compound they form is Sc₃N₃. Ionic compounds are written so that the negative and positive charges balance
3. The compound they form is Sc₃N. Ionic compounds are written so that the negative and positive charges balance
4. The compound they form is ScN₃. Ionic compounds are written so that the negative and positive charges balance

Names and Formulas of Compounds - Section 4.2 Quiz