Dimensional Analysis
An optician measures the diameter of her patient's pupil, the diameter is 0.0045 m. What is the diameter in mm?
4.5 mm
Isotopes have different numbers of _____________
neutrons
What is the difference between molecular and ionic compounds?
molecular: nonmetal + nonmetal
ionic: metal + nonmetal
How many moles of hydrogen are in CH3(OCH3)3?
12
If the boiling point of liquid oxygen is 90.19 K, what is its temperature in units of degrees Celsius? (HINT: T°C + 273.15 = T°K)
-182.96 °C
A metal block has a length of 10 cm, a width of 5 cm, and a height of 6 cm. It has a mass of 3600g. What is it's density in g/cm3?
12 g/cm3
How many electrons does a neutral atom of Si have?
14
What is the name of Br2O?
dibromine monoxide
A chemist weighs 33.7 grams on tin. How many moles is this?
0.284 mol
Calculate the mass percent of carbon in acetone: (CH3)2CO
62%
An energy drink typically has a volume of 12 fluid ounces. What is the volume in L? (HINT: 1 oz = 29.57 mL)
0.35 L
Strontium is in column 2 of the periodic table. Elements in this column are called?
Alkaline Earth metals
What is the chemical formula for phosphoric acid?
H3PO4
A chemist finds that 98.5 g of oxygen gas is produced in an experiment. How many moles of oxygen gas was produced?
3.08 mol O2
BONUS!
A chemistry student needs 35.0 mL of chloroform for an experiment. The density of chloroform is 1.48 g/cm3. How many grams of chloroform does the student need? (HINT: cm3 = mL)
51.8 g
How many protons and neutrons are in an atom of 222Rn?
protons: 86
neutrons: 136
What is the formula for lead(IV) permanganate?
Pb(MNO4)4
Calculate the number of oxygen atoms in a 130.0 g sample of dinitrogen tetroxide (N2O4).
3.403 x 1024 oxygen atoms
mechanical, heat, temperature, electrical, or chemical
temperature
How many miles are in 6.7 x 105 cm? (1 in = 2.54 cm; 1 mi = 5,280 ft)
4.16 miles
What is the atomic mass of tin, if:
115Sn has a relative abundance of 47% and mass of 114.9 g
120Sn has a relative abundance of 53% and mass of 119.9 g
117.55 grams
Name the following acid: HClO
hypochlorous acid
Compound X has a molar mass of 579.39 g/mol and the following composition:
P = 26.73%; N = 12.09%; Cl = 61.18%
Determine the molecular formula of X
P5N5Cl10
Calculate the mass percent of oxygen in lead(II) nitrate
29%