How many Joules are in 146 calories (conversion is famous number for water's specific heat)
What is 610 Joules
What happens to energy when is moves from one system to another
What is energy is conserved OR heat in equals heat out (q=-q)
Add 2 or more thermochemical equations to give you a final equation
What is the heat of the reaction (or Hess' Law)
What happens to the water in a calorimeter when an exothermic reaction occurs in it
What is absorbs heat, and a rise in temperature.
What is the specific heat of a substance if 1560 calories is required to raise a 312 g sample by 15 degrees Celsius?
What is 0.33 cal/gºC
Name of the energy released or absorbed when a solid dissolves.
What is heat of solution
The Delta H for the reaction: Cl2 (g)+ H2 (g) -> 2 HCl (g) (H-Cl = 431 kJ/mol, H-H = 436 kJ, Cl-Cl = 243 kJ/mol)
What is (delta)H=-183 kJ/mol
Why does warm water have a more rapid of evaporation than cold water?
What is Its molecules have a higher average kinetic energy.
How much energy does it take to convert 750 grams of ice at -15ºC to liquid water at 40ºC? (H fusion = 333 J/g; c (ice)= 2.1 J/goC; c (water)= 4.18 J/goC)
What is 399 kJ
A quantity of heat needed to change 1 gram of water by 1 degree Celsius (or 4.18 Joules).
What is a calorie?
Find (delta)H of reaction: N2H4 (l)+H2 (g) -> 2NH3 (g)
Hf of N2H4 = +50.6 kJ/mol and Hf of NH3 = -46.2 kJ/mol
What is (delta)H=-143 kJ
What is the formula to calculate the amount of heat energy exchanged between the system and its surroundings?
What is q= m c (delta)T
2 KCl + 3 O2 --> 2KClO3 Given that the Hf of KCl is -436 kJ/mol and the Hf of KClO3 is -391 kJ/mol, determine the heat of reaction.
What is 90 kJ
When dissolving is exothermic
Solute-solvent bonds are greater than solute-solute and solvent-solvent bonds.
Find (delta)H: H2SO4(l) -> SO3(g)+H20(g)
Hf = -811.3 -395.2 -241.8
What is (delta)H= + 174.3 kJ
If you were to touch a flask in which an endothermic reaction was occurring, the flask would feel _____ than before the reaction started.
What is cooler
Some Water was heated with 41,840 Joules, raising its temperature from 22.0ºC to 28.5ºC. Find the mass of water.
What is 1540 g
What does it mean if the (delta)H value for a chemical reaction is positive?
What is reactants have less potential energy than products.
Find (delta)H: CS2(ℓ) + 3O2(g) ---> CO2(g) + 2SO2(g)
Given: C(s) + O2(g) ---> CO2(g) ΔH = −393.5 kJ/mol
S(s) + O2(g) ---> SO2(g) ΔH = −296.8 kJ/mol
C(s) + 2S(s) ---> CS2(ℓ) ΔH = +87.9 kJ/mol
What is (delta)H= -1075 kJ
What determines the amount of temperature change due to a chemical reaction?
What is the mass and amount of heat released or absorbed by the reaction