Balance Equation
Balance N2 + H2 -> NH3
1, 3, 2
What type of reaction lets off heat?
Exothermic
In the equation NaClO3 -> NaCl + O3, how many moles of NaCl are reacted with 4 moles of O3?
4
What is the final pressure of a gas at 1.00 atm heated from 293.15 K to 303.15 K?
1.03 atm
The capacity to supply heat or to do work
Energy
Balance K + Cl2 -> KCl
2, 1, 2
What type of reaction absorbs heat?
Endothermic
6
If 22.5 L of gas at 748 atm is compressed to 725 atm, what is the new volume?
23.2
Compare potential energy and kinetic energy.
Potential energy: The energy of an object has because of its position, composition, or condition. Kinetic energy: the energy of an object possesses because of its motion.
Balance KClO3 -> KCl + O2
2, 2, 3
Exothermic
In 2KClO3 -> 2KCl + 3O2, how many moles of oxygen are produced by 6 moles of potassium chlorate?
9
What is the final temperature when at gas at 6 L at 293 K is compressed to 4 L?
195.3
Thermal energy is kinetic energy associated with...
the random motion of atoms and molecules
Balance ZnS + AlP -> Zn3P2 + Al2S3
3, 2, 1, 1
Is cooking an egg exothermic or endothermic?
Endothermic
In 4NH3 + 3O2 -> 2N2 + 6H2O, how many moles of O2 are reacted with 11 moles of NH3?
8.25
A gas with a volume of 4.0 L at a pressure of 205kPa is allowed to expand to a volume of 12 L. What is the pressure in the container if the temperature stays constant?
68.3
The substance or substances undergoing the chemical/physical change in a reaction is called...
The system
Balance Na + H2O -> NaOH + H2
2, 2, 2, 1
Give an example of an endothermic and an exothermic reaction.
Examples vary.
In K3PO4 + Al(NO3)3 -> 3KNO3 + AlPO4, how many moles of potassium nitrate are produced when 2.5 moles of potassium phosphate react?
7.5
A tank of gas at 900 atm at a temperature of 27 C drops to -183 C. What is the new pressure?
270
The heat (q) of a substance is equal to...
-q (heat) of the surroundings