Chemical reactions
When doing a mole-to-mole conversion using a balanced chemical equation, what is the name of the conversion factor you use?
Molar ratio
On average, are gas molecules faster or slower than liquid molecules?
Faster
If we know the size of a room, its temperature, and its pressure, what can the ideal gas law tell us?
The amount of gas inside
If an athlete needs to drink a solution with lots of electrolytes but very little dissolved gas should the solution be hot or cold?
Hot
If I shake an open soda and a closed soda which will have more gas dissolved after 5 minutes?
The closed soda
Molar mass is the conversion factor that helps you go between what two units?
Grams and moles
With all other things held constant, how does pressure change when increasing temperature?
It increases
With all other things held constant, how does pressure change when increasing volume?
It decreases
Solutions can be solids, liquids, or gases, what is an example of each of these?
There are various options
What kind of mixtures can be separated by semipermeable membrane or filtration?
Suspensions
When I mix baking soda and vinegar and put my hand near the reaction, the air is cold, what kind of reaction is this in terms of heat?
Endothermic Reaction
At STP, how many moles are in 2.25L?
0.100 moles
What change happened to cause an increase in pressure in a container if the size and amount of gas didn’t change?
Increase in temperature
45g of Br2 solute is mixed with 87g of hexanes solvent, what’s the mass by mass percentage of Br2?
34.1% by mass
Determine what kind of solvent the following substance will dissolve in and determine if it is an electrolyte or nonelectrolyte.
NH4Cl
Polar solvent, electrolyte.
In 0.333 moles of Na2SO4 how many Oxygen (O) atoms are there?
A balloon is 0.50L big at 25°C with 0.010 moles of gas. If it gets 10°C HOTTER and 0.0050 moles of gas are ADDED to the balloon, what’s the final volume?
1.05L
A box is 2.00L big at a temperature of 280°K with 0.0740 moles of gas, what’s its pressure in Torr? (1atm=760Torr)
646Torr
If 90g of ethanol is added to 450mL of water, what's the volume by volume percentage of the ethanol solution?
density of ethanol = 0.789 g/mL
20.2 % by volume
If 25mL of a 0.30M solution of KCl has 0.50L of water added to it, what is the molar concentration of KCl?
0.014M
A reaction is modeled below where O2 is the limiting reactant. If we start with 4.000 moles of O2 and get out 260.1g of Al2O3 what is the percent yield? (molar mass of Al2O3 = 101.96 g/mol)
4Al + 3O2 → 2Al2O3
95.66% yield
According to the reaction below, would the pressure be higher before the reaction begins or after the reaction is fully complete? Assuming that temperature and volume are constant.
N2O (g) + 4H2 (g) → 2NH3 (g) + H2O (l)
Before
Your pressure cooker has a broken thermometer but that’s ok. You need to cook dinner at 120°C, and you know that the pressure in the pressure cooker in your 17°C house is 102kPa. What pressure do you need to cook dinner at? (1atm=101.325kPa)
7.11atm or 720kPa
What’s the m/m concentration of a 0.333M NaOH solution? (NaOH= 40.00g/mol, H2O= 18.02g/mol, H2O= 1.00g/mL)
1.31%
6.00L of a 1.50M NaCl solution is mixed with 2.00L of a 0.400M NaOH solution, what’s the final molar concentration of sodium ions?
1.23M