Chemistry Quiz

A beaker contains 50mL of a 1.5M NaOH solution. Water is added until the concentration becomes 0.5M. What is the final volume of the solution?

• A – 150mL

• B – 200mL

• C – 75mL

• D – 100mL

Which sequence correctly orders the electronegativity of O, Cl, Mg, and K from smallest to largest?

• A – K < Mg < O < Cl

• B – Mg < K < Cl < O

• C – K < Mg < Cl < O

• D – Mg < Cl < K < O

Which pair of elements is most likely to form an ionic compound?

• A – iron and sulfur

• B – nitrogen and oxygen

• C – calcium and oxygen

• D – carbon and nitrogen

What is the correct ionic formula for aluminum sulfate?

• A – AlSO4

• B – Al2(SO4)3

• C – Al3SO4

• D – Al(SO4)2

What is the molar mass of sodium chloride (NaCl)?

• A – 58.5 g mol⁻¹

• B – 40.0 g mol⁻¹

• C – 23.0 g mol⁻¹

• D – 35.5 g mol⁻¹

The molecular geometry of phosphorus trifluoride (PF₃) is best described as:

• Linear

• Trigonal planar

• Tetrahedral

• Trigonal pyramidal

Which of the following groups contains only nonpolar molecules?

• O₂, N₂, CO₂

• H₂O, CH₄, H₂S

• H₂, NH₃, CH₄

• NH₃, HCl, O₂

The unbalanced partial chemical equation below represents a double displacement reaction. BaCl₂(aq) + Na₂SO₄(aq) → ______________________________ The complete balanced equation is:

• BaCl₂(aq) + Na₂SO₄(aq) → BaSO₄(s) + 2NaCl(aq)

• BaCl₂(aq) + Na₂SO₄(aq) → 2BaSO₄(s) + Na₂Cl₂(aq)

• BaCl₂(aq) + 2Na₂SO₄(aq) → Ba(SO₄)₂(s) + NaCl(aq)

• BaCl₂(aq) + Na₂SO₄(aq) → BaSO₄(s) + Na₂Cl(aq)

The following energy diagram represents what type of reaction?

• Endothermic

• Exothermic

• Catalysed pathway

• Potential energy

Which of the following compounds is soluble in water?

• BaSO₄

• KNO₃

• PbCl₂

• CaCO₃