IB Chemistry Topic 4

Which is correct about energy changes during bond breaking and bond formation?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-4

Some water is heated using the heat produced by the combustion of magnesium metal. Which values are needed to calculate the enthalpy change of reaction?

• I and II only

• I and III only

• II and III only

• I, II and III

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

Which of the following reactions are exothermic?

• I and II only

• I and III only

• II and III only

• I, II and III

Tags

NGSS.HS-PS1-4

What is the enthalpy change of the reaction?

• + 1411 + 2878 + 4163

• + 1411 − 2878 − 4163

• + 1411 + 2878 − 4163

• − 1411 − 2878 + 4163

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

What is the enthalpy change of reaction for the following equation?

• x + y + z

• −x − y + z

• x − y − z

• x − y + z

Tags

NGSS.HS-PS1-4

What is the standard enthalpy change, in kJ, of the reaction below?

4Al (s) + 3MnO₂ (s) → 2Al₂O₃ (s) + 3Mn (s)

• −1670 + 520

• 32(−1670) + 3(520)

• 2(−1670) + 3(−520)

• 2(−1670) + 3(520)

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Consider the following equations.

2Al (s) + 3/2 O₂ (g) → Al₂O₃ (s) ΔH^Ɵ = −1670 kJ

Mn (s) + O₂ (g) → MnO₂ (s) ΔH^Ɵ = −520 kJ

What is the standard enthalpy change, in kJ, of the reaction below?

4Al (s) + 3MnO₂ (s) → 2Al₂O₃ (s) + 3Mn (s)

• −1670 + 520

• 32(−1670) + 3(520)

• 2(−1670) + 3(−520)

• 2(−1670) + 3(520)

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4

What is the enthalpy change of reaction for the following equation? C₂H₄ (g) + H₂ (g) → C₂H₆ (g) C₂H₄ (g) + 3O₂ (g) → 2CO₂ (g) + 2H₂O (l) ΔH = x C₂H₆ (g) + 7/2 O₂ (g) → 2CO₂ (g) + 3H₂O (l) ΔH = y H₂ (g) + 1/2 O₂ (g) → H₂O (l) ΔH = z

• x + y + z

• −x − y + z

• x − y − z

• x − y + z

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Consider the following reactions:Fe₂O₃ (s) + CO (g) → 2FeO (s) + CO₂ (g) ΔH^Θ = −3 kJFe (s) + CO₂ (g) → FeO (s) + CO (g) ΔH^Θ = +11 kJ
What is the ΔH^Θ value, in kJ, for the following reaction?Fe₂O₃ (s) + 3CO (g) → 2Fe (s) + 3CO₂ (g)

• -25

• -14

• +8

• +19

Tags

NGSS.HS-PS1-4

What is the enthalpy of combustion of butane in kJ mol⁻¹?

• 4x + 5y − z

• 4x + 5y + z

• 8x + 10y − 2z

• 8x + 5y + 2z

Tags

NGSS.HS-PS1-4