Unit 5
When converting from grams to moles, your answer should get: (bigger or smaller)
Smaller
Name 3 signs of a chemical reaction.
1. Fizzing/Bubbling
2. Color Change
3. Temperature change
4. Production of a gas
5. Production of a solid
Explain in terms of particle motion, what would happen if you took a balloon from the freezer and brought it into a warmer environment.
The particles would move faster and therefore the volume would increase.
Either: Increase the solute or decrease the solvent
Find the molar mass of Ca(NO3)2
164 grams/mole
To convert from moles to atoms you use __________.
Avogadros Number
Balance the reaction and name the type of reaction
_____RbS10 → ____Rb + ____S2
1, 1, 5 Decomposition
As the volume of a gas decreases, the pressure will ___________.
As the temperature of a gas decreases, the pressure will ___________.
Increase, decrease
How many moles of HCl are present in 2.00 L of a 0.750 M HCl solution?
1.5 moles
Draw and label the following pieces of glassware.
Graduated cylinder, Beaker, Volumetric Flask, Pipette, Erlenmeyer Flask
I'll walk around to check.
Calculate how many moles are in 82.34 grams of CH4
5.14 moles
Balance the equation and name the type of reaction
___LuCl3 + ____Ca → _____Lu + _____CaCl2
2, 3, 2, 3 Single Replacement
A sample of gas at 323 K is cooled to 172 Kelvin, and has a new volume of 7.50 L. Calculate the initial volume of the gas, assuming the pressure remains constant.
14.04 L
Explain the three factors that affect solubility
As surface area increases, solubility will increase
As temperature increases, solubility will increase
As aggitation increases, solubility will increase
A compound is made up of 24 grams of Carbon and 18 grams of Oxygen. Calculate the percent composition for both carbon and oxygen.
Carbon: 57.2%
Oxygen: 42.8%
(Unit 6)
Calculate how many grams are in 3.2x1023 atoms of H2O.
9.6 grams
__2__AgN3 → ___3_N2+ __2_Ag
A student wanted to produce 50 grams of Ag, how many moles of AgN3 would she need to start with?
0.46 moles
A gas occupies 4.0 L at 1.2 atm. What volume will it occupy at 2.4 atm, assuming constant temperature?
2 L
What volume of 12.0 M HCl is needed to prepare 250.0 mL of 1.0 M HCl?
A gas has a volume of 2.5 L at 1.0 atm and 300 K. What volume will it have at 0.80 atm and 350 K?
3.65 L
If you have 0.3 moles of LiCl and 0.4 moles of LiF, which sample has more grams? Support your answer with an explanation or calculation
LiCl: 12.69
LiF: 10.4 g
Answer: LiCl
C7H16 + 11 O2 → 7 CO2 + 8 H2O
Determine the mass of CO2 produced if 1.1 moles of C7H16 reacts with 72 grams of O2. Which is the limiting reactant?
63 grams, O2
A 56 gram sample of N2 gas is confined to a 3.0 L container at 400 K. Calculate the pressure in atm.
21.9 atm
Solution A has a pH of 8 and Solution B has a pH of 12.
Which solution has a higher concentration of OH-?
Which solution has a lower concentration of H+ ?
Which solution is the weaker base?
Which solution will most likely be conductive?
B, B, A, B
Find the products if H3O+ is an acid
H3O+ + HSO3- -->
H2O + H2SO3