Unit 4 Onramps Thermodynamics

What is the change in enthalpy (∆H) for the reaction from A → B?

• -50 kJ endothermic

• -150 kJ endothermic

• +50 kJ endothermic

• +300 kJ, exothermic

Tags

NGSS.HS-PS1-4

Twenty tortilla chips are combusted in a bomb calorimeter surrounded by 5 liters of water. The temperature of the water increases from 30℃ to 35℃. Assuming the heat capacity of the water is about 4 J/g∙ ℃ and the heat capacity of the calorimeter 2000 J/℃, what is the energy content of a single tortilla chip?

• 100 kJ

• 110 kJ

• 5.5 kJ

• 5 kJ

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

NGSS.HS-PS3-4

A 50 gram sample of delicious pork rinds is placed in an open, constant pressure calorimeter that contains 3000 grams of water. The temperature of the water increases by 47℃ when the pork rinds are combusted. The heat capacity for water is 4.184 J/g ∙ ℃. Assume the heat lost to the calorimeter itself or to the air is negligible. Which of the following is correct for the SYSTEM?

• ∆H = -590 kJ

• ∆H = +590 kJ

• ∆H = -11.8 kJ

• ∆H = +11.8 kJ

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

NGSS.HS-PS3-4

• -1119 kJ/mol

• -151 kJ/mol

• -243 kJ/mol

• -945 kJ/mol

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

• -980.8 kJ/mol

• -1650 kJ/mol

• -380.2 kJ/mol

• -15.2 kJ mol

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

• x + y + z

• x – y – z

• y – x – 2z

• 2z – x – y

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

• -802

• 1420

• -1420

• 203

Tags

NGSS.HS-PS1-4

• 200

• 1036

• 76

• 424

Tags

NGSS.HS-PS1-4

Predict the sign (+, -, or 0) of ∆G_f°, ∆H_f°, ∆S_f°, respectively, for the deposition of carbon dioxide (CO₂) at room temperature and atmospheric pressure. CO₂ (g) → CO₂ (s)

• -, +, +

• 0, +, +

• -, +, -

• +, -, -

Tags

NGSS.HS-PS1-4

Consider the information provided below: 2 SO₃(g)→2 SO₂(g) + O₂(g) ∆H^◦_r= +198 kJ/mol at 298 K. Which statement is true for this reaction?

• The reaction will not be spontaneous at any temperature

• The reaction will be spontaneous at all temperatures

• ∆G^◦ _r will be positive at high temperatures.

• ∆G^◦ _r will be negative at high temperatures

Tags

NGSS.HS-PS1-4