Solutions
What is the concentration of a 875 mL solution prepared with 3.84 g of ammonium nitride?
0.0548 M
How many fomula units are present in a 25.82 g sample of lead (II) nitrate?
4.69x1022 formula units of lead (II) nitrate
Medical-grade saline solutions (aqueous sodium chloride) have a molarity of 0.154 M. What is the mass of sodium chloride in a 100 cc (cm3) unit?
0.900 g of NaCl
Balance the following equation and identify the type of reaction:
Al + H2SO4 --> Al2(SO4)3 + H2
Type of reaction - Single Displacement
2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
What is the length of 184 inches in miles (5820 ft = 1 mi)?
2.63x10-2 miles
A 150. mL solution of NaOH has a concentration of 0.52 M. The solution is allowed to boil until the volume decreases by half. What is the new concentration of my solution?
1.04 M
A typical pill of ibuprofen (C13H18O2), used to treat pain and inflammation in the body, is 200 mg. Assuming that the pill is made entirely of ibuprofen, what is the number of molecules in the pill? The molar mass of ibuprofen is 206.29 g/mol
5.84x1020 molecules of ibuprofen
What is the volume, in L, of a 35.2 g sample of carbon tetrachloride? (density = 1.60 g/mL)
0.0224 L of CCl4
Balance the following equation and identify the type of reaction:
KClO3 --> KCl + O2
Type of reaction - Decomposition
2KClO3 --> 2KCl + 3O2
What is the volume of a 2.00 L soda in oz, knowing that 1 oz = 29.57 mL?
67.6 oz
After the winter, a swimming pool is prepared for the summer. If 907 g of pool shock (Ca(ClO)2; MM = 142.98 g/mol) is poured into a standard swimming pool with a volume of 108 kL, what is the concentration of the ClO- in the pool?
1.17x10-4 M
What mass of carbon is present in 4.87x1021 molecules of metformin (C4H11N5), a commonly prescribed drug used to treat insulin resistance and diabetes?
0.389 g of C
Commercial-grade lemonade contains citric acid at concentrations of 0.42 M. If one glass of lemonade is prepared with 6.43x1021 molecules of citric acid, what is the volume of lemonade in my cup in mL?
25.4 mL
Balance the following equation and identify the type of reaction:
AgNO3 + (NH4)2CrO4 --> Ag2CrO4 + NH4NO3
Type of reaction - Double Displacement
2AgNO3 + (NH4)2CrO4 --> Ag2CrO4 + 2NH4NO3
Cells in tissues are approximately 1.2 μm apart. What is this distance in km?
1.2x10-9 km
4.8 mL of a 0.32 mM is used to prepare a new solution with a concentration of 0.1 μM. What is the volume of my new solution?
15360 mL
What is the number of nitrate ions that will dissociate in a 8.756 g sample of Fe(NO3)3, a compound used in various processes like dyeing, tanning, and etching?
6.54x1022 nitrate ions
How many molecules of sugar (C12H22O11) are present in 10 sugar cubes if a typical sugar cube has a side length of 1.00 cm and if sugar has a density of 1.58 g/mL?
2.78x1022 molecules of sugar
Balance the following equation and identify the type of reaction:
C4H10 + O2 --> CO2 + H2O
Type of reaction - Combustion
2 C4H10 + 13 O2 --> 8 CO2 + 10 H2O
On average, hair grows at a rate of 0.50 inches per month. Assuming one month is 30 days, and knowing that there are 5820 ft in one mile, what is this speed in mph?
9.94x10-9 mph
A 125 mL solution of KOH is prepared using 5.87 g. The solution is then diluted to a concentration of 0.32 M. How much water did was added to my initial solution?
202 mL of water added
How many total ions will dissociate in 67.31 g of Al2O3? (MM = 101.96 g/mol)
1.99x1024 total ions
DAILY DOUBLE!
What is the concentration of a 375 mL solution made with 5.50 cm3 of CuSO4? (density = 3.6 g/mL; MM = 159.61 g/mol)
0.330 M copper (II) sulfate
Balance the following equation and identify the type of reaction:
C6H6 + O2 --> CO2 + H2O
Type of reaction - Combustion
2 C6H6 + 15 O2 --> 12 CO2 + 6 H2O
Wind turbines spin at a speed of 8.9 mph. Knowing that there are 5820 ft in a mi and that 1 in is 2.54 cm, what is this speed in km/s?
4.39x10-3 mph