Week 11 Exam 2 Practice

Which of the following represents a synthesis (combination) reaction?

• 2 H2O → 2 H2 + O2

• N2 + 3 H2 → 2 NH3

• 2 KClO3 → 2 KCl + 3 O2

• CuSO4 + Zn → ZnSO4 + Cu

In the reaction Zn + CuSO4 → ZnSO4 + Cu, which element is reduced? Enter the element symbol.

Tags

NGSS.HS-PS1-2

Which of the following is a weak electrolyte?

• NaOH (aq)

• HCl (aq)

• CH3COOH (aq)

• KNO3 (aq)

Which compound is insoluble in water?

• Na2SO4

• KCl

• PbI2

• LiNO3

According to the Bronsted–Lowry theory, which is a base?

• H2SO4

• NH3

• HCl

• H3O+

What is the molarity of a solution made by dissolving 15.0 g of KOH (M = 56.1 g/mol) in 500. mL of water? Enter the number only with no units.

Which statement is true about bond length and bond energy?

• Longer bonds are stronger.

• Shorter bonds have higher bond energy.

• Bond length and strength are independent.

• Double bonds are longer than single bonds.

Tags

NGSS.HS-PS1-4

The percent by mass of carbon in CO₂ is approximately: Enter the number only with no "%" sign.

Tags

NGSS.HS-PS1-7

Which element has the lowest electronegativity?

• Fluorine

• Sodium

• Chlorine

• Oxygen

• 1, 4, 3, 4; synthesis

• 1, 5, 3, 4; combustion

• 2, 7, 6, 6; combustion

• 1, 3, 3, 2; decomposition