Chemistry Section 2 / Nomenclature and Equations

Which of the following elements is not diatomic?

HINT: -gens are twins

• Oxygen (O2)

• Bromine (Br2)

• Nitrogen (N2)

• Potassium (K)

What is the correct formula for calcium chloride?

• CaCl

• CaCl3

• Ca2Cl

• CaCl2

What is the charge of sodium in the compound Na2O?

• +1

• -1

• +2

• -2

Which of the following compounds is named incorrectly?

• NH₄Cl - ammonium chloride

• NaNO₃ - sodium nitrate

• Mg₃(PO₄)₂ - magnesium phosphate

• K₂O - potassium oxolate

What is the correct formula for lithium nitride following the criss-cross rule for charges?

• Li₃N

• LiN₃

• Li₂N₃

• LiN₂

How do you write the formula for a compound with polyatomic ions, such as copper (II) sulfate?

• CuSO₄

• Cu₂(SO₄)

• Cu(SO₄)₂

• Cu₂SO₄

What is the correct formula for copper(II) hydroxide?

• CuOH

• Cu(OH)₂

• Cu₂OH

• Cu(OH)

Which of the following is the correct formula for sulfuric acid?

• HNO₃

• H₂SO₄

• NH₄

• CH₄

What do the letters in parentheses in a chemical equation indicate?
For example: Zn(s) + HCl(aq) -> H₂(g) + ZnCl(aq)

• The number of molecules involved in the reaction

• The phase or state of the matter

• The temperature at which the reaction occurs

• The speed of the chemical reaction

What is the purpose of the coefficients in a chemical equation?

• To indicate the temperature at which the reaction takes place

• To show the speed of the reaction

• To ensure that the equation is balanced with equal numbers of atoms of each kind on both sides

• To display the concentration of the reactants and products