IB Chemistry Topic 4

What is the enthalpy change, in kJ, of the following reaction? 3H₂ (g) + N₂ (g) ⇌ 2NH₃ (g)

• (6 × 391) − [(3 × 436) + 945]

• (3 × 391) − (436 + 945)

• −[(3 × 436) + 945] + (3 × 391)

• −(6 × 391) + [(3 × 436) + 945]

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

When equal masses of X and Y absorb the same amount of energy, their temperatures rise by 5 °C and 10 °C respectively. Which is correct?

• The specific heat capacity of X is twice that of Y.

• The specific heat capacity of X is half that of Y.

• The specific heat capacity of X is one fifth that of Y.

• The specific heat capacity of X is the same as Y.

Tags

NGSS.MS-PS3-4

The combustion of glucose is exothermic and occurs according to the following equation:

C₆H₁₂O₆ (s) + 6O₂ (g) → 6CO₂ (g) + 6H₂O (g)

Which is correct for this reaction?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-4

The enthalpy change for the dissolution of NH₄NO₃ is +26 kJ mol^–1 at 25 °C. Which statement about this reaction is correct?

• The reaction is exothermic and the solubility decreases at higher temperature.

• The reaction is exothermic and the solubility increases at higher temperature.

• The reaction is endothermic and the solubility decreases at higher temperature.

• The reaction is endothermic and the solubility increases at higher temperature.

The same amount of heat energy is added to 1.00 g of each substance. Which statement is correct if all the substances are at the same temperature before the heat energy is added?

• Copper will reach the highest temperature.

• Water will reach the highest temperature.

• All four substances will reach the same temperature.

• Aluminium will reach a higher temperature than sodium chloride.

Tags

NGSS.HS-PS3-4

What is the temperature rise when 2100 J of energy is supplied to 100 g of water?

(Specific heat capacity of water =4.2 Jg⁻¹K⁻¹)

• 5°C

• 278 K

• 0.2°C

• 20°C

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The specific heat capacity of aluminium is 0.900 Jg⁻¹K⁻¹. What is the heat energy change, in J, when 10.0 g of aluminium is heated and its temperature increases from 15.0 °C to 35.0 °C?

• +180

• +315

• +1800

• +2637

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

Which ionic compound has the most endothermic lattice enthalpy?

• Sodium chloride

• Sodium oxide

• Magnesium chloride

• Magnesium oxide

Tags

NGSS.HS-PS1-4

Which process is endothermic?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Which reaction has an enthalpy change equal to the standard enthalpy change of combustion?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-4