U6: Chemical reactions
Miscellaneous
U8: Kinetic molecular theory
U9: Gas laws
Nuclear, pH and Molarity
100
If I have a mole of sodium chloride formula units, how many do I have?
What is 6.02 x 1023 formula units, Alex?
100
Consider the following reaction.
BaF2 (aq) + Li (s) → LiF + Ba
What type of reaction takes place here?
What is single replacement?
100
Refer to the heating curve. At what letter(s) would a solid and liquid coexist and what is the name of that process?
What is letter b and melting?
100
List 3 things that would increase the pressure of a gas in a container and explain WHY the pressure is increased. Using the mathematical definition of pressure, explain why.
What is: 1) increase number of molecules in the container, 2) decrease the volume of the container and 3) increase the temperature of the container?
Since pressure is F/a, all three of these either increase the force of the molecules colliding with the container (1, 2) or decrease the area (3), thus increasing the pressure.
100
Acids ionize to produce ____________ in water
What is hydrogen ions, Alex?
200
Balance the following AND identify the reaction type.
FeCO3 + Al(OH)3 → Fe(OH)2 + Al2(CO3)3
What is
3FeCO3 + 2Al(OH)3 → 3Fe(OH)2 + Al2(CO3)3
and a double replacement reaction, Alex?
200
What type of radiation has the highest penetrating power (goes through the least amount of things)?
gamma
200
This is how much heat energy is required to boil 200 grams of water.
What is 452,000 J?
200
Convert 900 Torr to atmospheres. Show your math.
900 Torr x 1 atm/760 Torr = 1.18 atm
200
What is the concentration of a solution that contains 0.25 moles of HBr is 500 mL of solution?
What is 0.5 M, Alex?
300
What are the missing coefficients for the chemicals in the reaction and why do we have to balance them?
Al2S3 + CaBr2 → CaS + AlBr3
What is because of the law of conversation of mass?
Al2S3 + 3CaBr2 → 3CaS + 2AlBr3
300
These are the two types of nuclear reactions:
1) When nuclei are joined together and
2) nuclei of atoms are bombarded with neutrons to form a daughter isotope and some form of radiation.
What is nuclear fussion and fission?
300
What does A, B and C represent? If this substance is at zero degrees and 6 atm, what could you do to get it to condense?
What is A-gas, B-liquid and C-solid.
What is lower the temperature or increase the pressure (keeping the other variable constant), Alex?
300
You bike a bag of chips from the base of a mountain 2000 feet in elevation. What happens to the bag and why, which law is this, and what is the relationship between the variables (show graph)?
The bag inflates because less air is pushing on it outside as the air mass thins (P down); Boyle's law, decrease air pressure, increase volume.
300
Find the pH of each of the following and classify as “acidic”, “basic”, or “neutral”.
[H3O+] = 1.9 x 10 –13 M
What is pH is 12.7 and a base?
400
Label A, B and C AND determine if this is energy curve represents an endothermic or exothermic reaction.
A and B are the energy in the bonds of the reactants (chemical potential energy) and C is the energy in the bonds of the product.
Endothermic
400
All molecular motion stops at this temperature.
What is absolute zero or O Kelvin?
400
You open up a vacuum and nitrogen gas and neon gas diffuse in. This gas diffuses faster and this is the reason why.
What is neon because it's lighter and lighter chemical diffuse faster than heavier.
400
If 907 mL of carbon dioxide gas at 100 deg. C is transferred to a vessel at 43 deg. Celsius, what volume does the gas now occupy? Name the law. Show your math.
768 mL; Charles law
400
What is the daughter isotope, what species of radiation was involved in the decay?
220 94 Pu → 42 He + ______
What is 216 92U and alpha decay?
500
Consider the following reaction. What three ways can we increase the number of collisions (and hence the reaction rate)?
BaF2(aq) + Li (s) ---→ LiF + Ba
What is
1) increase the concentration of the BaF2?
2) crush the solid lithium (to increase surface area)?
3) increase the temperature?
500
THis is the orbital filling diagram for the haolgen in the 3rd period.
500
A 500 g aluminum pan is heated on the stove. The temperature starts at 20 degrees and increases to 300 degrees. How much heat energy has it absorbed>
What is 125, 580 Joules of energy, Alex?
500
What is the temperature of 3 moles of hydrogen gas at 1.7 atm and 100.3 ml? Name the law.
What is 0.6922 K; ideal gas law, Alex?
500
How many hydrogen ions are in a solution with a pH of 8.5? Don't forget the units!
What is 3.16 x 10-9 M (moles of H+/L of solution)