Vocab
Define Energy
What is the ability to do work or produce heat?
Convert 56798 kJ to J
What is 56,798,000 J?
How much heat in must be removed from 225g of water to lower its temperature from 25.0 C to 10.0 C? (Specific heat of water = 4.18 J/gC)
What is 14,100 J?
When HCl(g) reacts with O2(g) according to the following reaction, 28.6 kJ of energy are evolved for each mole of HCl(g) that reacts. Complete the following thermochemical equation.
4HCl(g) + O2(g) --> 2 H2O(g) + 2 Cl2(g)
What is delta H in kJ?
What is -114 kJ?
Define thermodynamics
What is the study of energy?
Convert 60.1 cal to J
What is 251 J?
What are the units for q and mass?
When BrF3(g) reacts to form Br2(g) and F2(g), 271 kJ of energy are absorbed for each mole of BrF3(g) that reacts. Complete the following thermochemical equation.
2 BrF3(g) --> Br2(g) + 3 F2(g)
What is delta H in kJ?
What is 542 kJ?
Define a system
What is the part of the universe observed?
What is 169 cal?
How many joules of heat are given off when 5.0 g of water cool from 75oC to 25oC? (Specific heat of water = 4.18 J/goC)
What is -1.0 x 103 J?
C2H4 (g) + H2O (g) --> CH3CH2OH (g)
Delta H= -45.6 kJ
How many grams of C2H4 (g) would have to react to produce 17.2 kJ of energy?
What is 10.6 g C2H4?
Give an example of an endothermic and exothermic process (Have to correctly answer for both)
Endothermic: What is an ice cube melting?
Exothermic: What is a log burning?
(Can accept other examples if they are accurate)
Convert 0.5753 kJ to cal
What is 137.5 cal?
How many calories of heat are necessary to raise the temperature of 25 g of water from 10oC to 60oC? (Specific heat of water = 4.18 J/goC)
What is 1,000 cal?
CH4 + 2 O2 --> CO2 + 2 H2O
Delta H = -802 kJ
When 3.95 grams of CH4 react with excess O2, _________ kJ of energy are evolved or absorbed?
What is 198 kJ are evolved?
(I will accept negative sign or no negative sign since evolved is used in the same sentence)
Define temperature
What is a measure of the random motions of the components of a substance?
Convert 7.5 Cals to kJ
What is 31 kJ?
What is the specific heat of lead if it takes 96J to raise the temperature of a 75g block by 10oC?
What is 0.1 J/gC?
2 H2O2 --> 2 H2O + O2
Delta H = -196 kJ
How many grams of H2O2 would have to react to produce 29.4 kJ of energy?
What is 10.2 g H2O2?