Chem 111- Test 1
Claculate the number of moles and formula units in 47.5 g of NaClO4.
0.387 moles 2.29 × 10^23
Sulfur dioxide reacts with chlorine to produce thinoyl chloride 9used as a drying agent for inorganic halides) and dichlorine oxide (used as a bleach for wood, pilp, and textiles). SO2 + 2Cl2 → SOCl2 + Cl2O If 0.400 mol of Cl2 reacts with excess SO2, how many moles of Cl2O are formed?
0.200 mol
Magnesium fluoride is used in the ceramics and glass industry. What is the mass of 1.72 mol of magnesium fluoride? - 43.3 g - 62.3 g - 74.5 g - 92.9 g - 107 g
107 g
Silicon, which makes up about 25% of Earth's crust by mass, is used widely in the modern electronics industry. It has three naturally occurring isotopes, 28 Si, 29 Si, and 30 Si. Calculate the atomic mass of silicon. Isotope, Isotopic, Mass Abundance % 28Si, 27.9276927, 92.23 29Si, 28.976495, 4.67 30Si, 29.973770, 3.10
28.08 amu
Aluminum sulfate, Al2(SO4)3, is used in tanning leather, purifying water, and manufacture of antipersipirants. Calculate its molar mass. - 450.06 - 342.15 - 315.15 - 278.02 - 74.98
342.15
Bromine is the only nonmetal that is a liquid at room temperature. Consider the isotope bromine-81 ( 81/ 35 Br) Select the combination which lists the correct atomic number, neutron number, and mass number, respectively. - 35, 46, 81 - 35, 81, 46 - 81, 46, 35 - 46, 81, 35 - 35, 81, 116
35, 46, 81
How many grams of carbon dioxide are formed when 263.8 g of propane, C3H8, reacts with 425.0 g of oxygen?
350.7 g
Isoprophyl alcohol, commonly known as rubbing alcohol, boils at 82.4 C. What is the boiling point in kelvins? - 387.6 K - 355.6 K - 323.6 K - 190.8 K - 190.8 K
355.6 K
The mass of a sample is 550 milligrams. Which of the following expresses that mass in kilograms? - 5.5 × 10^8 -5.5 × 10^5 -5.5 × 10^-4 -5.5 × 10^-6 -5.5 × 10^-1
5.5 × 10^-4
Which measurment is expressed to 4 significant figures? - 0.00423 kg - 24.049 cm - 1300 K - 82,306 m - 62.40 g
62.40 g
Which of the following correctly expresses 0.000007913 g in scientific notation? - 7.913 9.6 × 10^6 - 7.913 9.6 × 10^5 - 7.913 9.6 × 10^-5 - 7.913 9.6 × 10^-6 - 7.913 9.6 × 10^-9
7.913 9.6 × 10^-6
What is the formula for lithium nitrite? - LiNO2 - Li2NO2 - LiNO3 - Li2NO3 - LiNO4
LiNO2
Which of the following compounds is ionic? - PF3 - CS2 - HCl - SO2 - MgCl2
MgCl2
Which of the following ions occurs commonly? - N3+ - S6+ - O2- - Ca+ - Cl-
O2-
Which of the following compounds is covalent? - CaCl2 - MgO - Al2O3 - Cs2 - PCl3
PCl3
What is the formula for lead (II) oxide? - PbO - PbO2 - Pb2O - PbO4 - Pb2O3
PbO
Which on of the following combinations of names and formulas of ions is incorrect? - Bs2+ barium - S2- sulfate - CN- cyanide - ClO4- perchlorate -HCO3- bicarbonate
S2- sulfate
Express 96,342 m using 2 significant figures? - 9.60 × 10^4 - 9.6 × 10^4 - 9.60 × 10^-4 - 9.6 ×10^-4 96000
9.6 × 10^4
Balance the equation: B2O3 + HF → BF3+ H2O
B2O3 + 6HF → 2BF3 + 3H2O
Barium sulfate is used in manufacturing photographic paper. What is its formula? - BaSO4 - Ba(SO4)2 - Ba2SO4 - Ba2(SO4)3 - BaSO3
BaSO4
The compound, BaO, absorbs water and carbon dioxide readily and is used to dry gases and organic solvents. What is its name? - barium oxide - barium (II) oxide - barium monoxide - baric oxide - barium peroxide
barium oxide
What is the name of BBr3? - boron bromide - boric tribromide - boric bromide - tribromobride - bromine triboride
boron tribromide
Which of the following is a non-metal? - lithium - bromine - mercury - bismuth - sodium
bromine
One mole of O2 has a mass of 16.0 g. - true - false
false
The S.I base unit of mass is? - mg - g - kg - metric ton - lb
kg
The substance, KClO3, is a strong oxidizer used in explosives, fireworks, and matches. What is its name? - potassium chlorite - potassium chloride - potassium (I) chlorite - potassium (I) chlorate - potassium chlorate
potassium chlorate
Which of the following is a chemical change? - bioling of water - melting wax - a silver fork tarnishing - condensing water vapor into rainfall - carving a peice of wood
silver fork tarnishing
