Thermo

C+ O₂ --> CO₂ + 60kJ, what is the value for ΔH for the reaction?

• +60

• -60

• there is no way to know

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

What will ΔH be if there is 1 mole of oxygen? 4Fe(s) + 3O₂(g) --> 2Fe₂O₃(s) ΔH = –1500 kJ

• -500 kJ

• 500 kJ

• -750 kJ

• -4500 kJ

Tags

NGSS.HS-PS1-4

2N₂ + 3H₂ --> 2NH₃ + 46 kJ
How much energy would be produced if only 1 mol of nitrogen was reacted?

• 92 kJ

• 0.143 kJ

• 23 kJ

• 15 kJ

Tags

NGSS.HS-PS3-1

Solve for the standard enthalpy of reaction (ΔH). Determine if the reaction is endothermic or exothermic.

• 40.7, endothermic

• -40.7, exothermic

• 106.4, endothermic

• -106.4, exothermic

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

What is the formula for calculating heat?

• q = mcΔT

• H = ΔH x moles

• H = ΔH x grams

• products - reactants

• 1 J/g*C

• 250000 J/g*C

• 500 J/g*C

• 10 J/g*C

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

Between which points is the temperature of the substance remaining constant?

• A-B only

• A-B, C-D, and E-F

• B-C only

• B-C and D-E

Tags

NGSS.MS-PS1-4

A metal cube at temperature of 10°C immersed in a liquid at temperature of 70°C.
What is the temperature of the metal cube when thermal equilibrium is achieved between the cube and the liquid?

• Between 10°C and 70°C

• More than 70°C

• Less than 10°C

• Same as the room temperature

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

NaHCO₃ decomposes when exposed to heat: 2 NaHCO₃(s) → Na₂CO₃(s) + CO₂(g) + H₂O(ℓ) ΔH = 91.5 kJ What mass of NaHCO₃ is decomposed by 256 kJ?

• 470. g NaHCO₃

• 235. g NaHCO₃

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

What kind of graph is this?

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4