Chemistry Quiz

Which of the following is a diatomic molecule?

• Helium (He)

• Oxygen (O₂)

• Carbon (C)

What is the chemical formula for potassium nitrate?

• KNO₃

• K₂O

• KCl

What is the charge of a sodium ion (Na⁺)?

• -1

• +1

• +2

Which of the following is an example of a physical property?

• Reactivity with acid

• Melting point

• Flammability

What type of bond is formed when electrons are shared between atoms?

• Ionic bond

• Covalent bond

• Metallic bond

Which of the following compounds is ionic?

• H₂O

• CO₂

• NaCl

Draw the Lewis diagram for NaCl. Which of the following represents the correct structure?

• Na⁺ [Cl]⁻

• Na-Cl

• Na=Cl

Balance the equation: H₂ + O₂ → H₂O. What are the correct coefficients?

• 1, 1, 1

• 2, 1, 2

• 2, 2, 2

Translate the formula FeBr₃ to its name.

• Iron(II) bromide

• Iron(III) bromide

• Iron bromide

Which of the following reactions is a synthesis reaction?

• 2H₂ + O₂ → 2H₂O

• 2H₂O → 2H₂ + O₂

• NaCl + AgNO₃ → NaNO₃ + AgCl