If you add 2 or more thermochemical equations to give you a final equation, what does it allow you to do?
What is determine the heat of the reaction directly
100
What happens to the water in a calorimeter when an exothermic reaction occurs in it?
What is absorbs heat, and a rise in temperature.
200
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
200
Which process is exothermic the vaporization of water/the freezing of water?
What is the freezing of water
200
The energy released or absorbed when a solid dissolves.
What is heat of solution
200
Cl2(g)+2 HBr(g) -> 2 HCl(g)+Br2(g) (delta)H=
What is (delta)H=-112kJ
200
Why does warm water have a more rapid of evaporation than cold water?
What is Its molecules have a higher average kinetic energy.
300
How much energy does it take to convert 750 grams of ice at -15ºC to liquid water at 40ºC?
What is 399 kJ
300
What kind of equation is the following reaction:
CH4 + O2 -> CO2 + H2O + 1725 kcal
What is exothermic
300
A quantity of heat needed to change 1 gram of water by 1 degree Celsius.
What is calorie
300
Find (delta)H: N2H4(l)+H2(g) -> 2NH3(g)
What is (delta)H=-18kJ
300
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
400
2 KCl + 3 O2 -> 2KClO3
Given that the heat of formation of potassium chloride is -436 kJ/mol and the heat of formation of potassium chlorate is -391 kJ/mol, determine the heats of reaction.
What is 90 kJ
400
What is an exothermic reaction?
What is a chemical reaction that releases energy
400
When can heat changes also occur?
What is when a solute dissolves in a solvent.
400
Find (delta)H: H2SO4(l) -> SO3(g)+H20(g)
What is (delta)H=72.5kJ
400
If you were to touch a flask in which an endothermic reaction was occurring, the flask would feel _____ before the reaction started.
What is cooler than
500
A certain mass of water was heated with 41,840 Joules, raising its temperature from 22.0ºC to 28.5ºC. Find the mass of water
What is 1538.46 g
500
What happens to the system in an endothermic process?
What is the system gains heat and the surroundings cool down
500
What does it mean if the (delta)H value for a chemical reaction is positive?
What is reactants have less potential energy than products.