Unit 1
How many sig figs are in the following measurements?
1.) 6.0304
2.) 0.00345016
3.) 75000
1.) 5
2.) 6
3.) 2
Which two groups on the periodic table are the most reactive?
Alkaline metals and Halogens
What are the two common transition metals and their charges to memorize?
1.) Silver, Ag+
2.) Zinc, Zn+2
Which law states that the higher the charge, the shorter and stronger the attraction is?
Coulomb's Law
What are the 5 types of chemical equations?
Synthesis, Decomposition, Single Displacement, Double Displacement, and Combustion
What is the volume of a chunk of gold with a mass of 246 g and a density of 30.4 g/cm3?
8.09 cm3
Consider the following pairs, determine whether the pairs are isotopes.
1.) 38K and 39K
2.) 1H and 2H
3.) 11B and 11C
1.) Yes
2.) Yes
3.) No
What are the seven diatomic elements?
Hydrogen, nitrogen, oxygen, fluorine, bromine, chlorine, iodine
What is the molar mass of Ammonium Dichromate? Round to the nearest whole number.
252 g/mol
Will the following reactions occur?
1.) I2 + 2NaCl ---> Cl2 + 2NaI
2.) 3CuSO4 + Fe3(PO4)2 --->Cu3(PO4)2 + 3FeSO4
3.) Na2SO4 + BaCl2 ---> 2NaCl + BaSO4
1.) No
2.) Yes
3.) Yes
0.005421 km = _ cm?
542.1 cm
Carbon has three isotopes. 98.9% of Carbon atoms have 6 neutrons, 1.09% of Carbon atoms have 7 neutrons, and 0.01% of Carbon atoms have 8 neutrons. Determine the average atomic mass of this element (Carbon's atomic number = 6). Round to the nearest thousandths.
12.011 amu
Give the symbol and charges for the following polyatomic ions.
1.) Hydroxide
2.) Bicarbonate
3.) Hydronium
4.) Oxalate
5.) Acetate
1.) OH-
2.) HCO3-
3.) H3O+
4.)C2O4-2
5.) C2H3O2-
Given the compound name, write the formula.
1.) Chromium (II) Nitride
2.) Magnesium Permanganate
3.) Nitrogen Trifluoride
1.) Cr3N2
2.) Mg(MnO4)2
3.) NF3
Given the following reaction:
4A + 5B ---> C + 3D
If 5.0 moles of A react with 4 moles of B, how many moles of C will be produced?
0.8 mols
0.016 km/s = _ cm/hr?
58,000,000 cm/hr
Naturally occurring oxygen is composed of three isotopes: 99.757% O-16 (mass 15.9949 amu), 0.038% O-17 (mass 16.9991 amu), and the third with a percent abundance of 0.205%. Determine the amu of the third isotope given that the oxygen's atomic mass is equal to 16 amu. Round to nearest thousandths.
18.297 amu
What are 5 properties you would expect for the compound PCl3?
Melts at low temperatures, doesn't dissolve in water, doesn't conduct electricity, soft, and odorous.
You have 21.4 g of nitric acid, HNO₃. How many moles of acid do you have? How many molecules are in this sample? How much of each element do you have in this sample?
Moles = 0.340 mol
Molecules = 2.04 x 1023 or 2.04e23
Hydrogen = 0.342 g
Nitrogen = 4.76 g
Oxygen = 16.3
Predict the products of the following chemical reactions as well as balancing the equations. State the type of chemical reaction and the sum of the coefficients.
1.) Pb(NO3)2 + KOH ---> ???
2.) C12H22O11 + O2 ---> ???
3.) Cl2 + MgI2 ---> ???
1.) Pb(NO3)2 + 2KOH ---> 2Pb(OH)2 + KNO3; Double Displacement, 6
2.) C12H22O11 + 12O2 ---> 12CO2 + 11H2O; Combustion, 36
3.) Cl2 + MgI2---> MgCl2 + I2; Single Displacement, 4
A bag of candy has a serving size of 50 pieces (45g), 235 g calories per serving, and 15 total fat per serving. How many candies are in a 28-ounce bag? (1 ounce = 28.35 grams). Round to nearest whole number.
881 candies
Magnesium has three naturally occurring isotopes. One has 12 neutrons with a percent abundance of 78.99%, another has 13 neutrons, and the last has 14 neutrons. Determine the percent abundance of the other two isotopes (Magnesium's atomic mass = 24.30, atomic number = 12)
25M = 12.02%
26M = 8.99%
Name the following compounds.
1.) H3OCN
2.) Al4C3
3.) S2F10
4.) CoCl3
5.) C2H6O3
1.) Hydronium Cyanide
2.) Aluminum Carbide
3.) Disulfur Decafluoride
4.) Cobalt (III) Chloride
5.) Ammonium Acetate
Find the empirical formula of the compound that comprised of 40.0% Carbon, 6.7% Hydrogen, and 53.3% Oxygen.
CH2O
50g of Benzene (C6H6) is placed in a container with a 160g of Oxygen gas. After the reaction 30 grams of water was collected. Determine the limiting and excess reactant. What is the percent yield? Round to nearest hundredth.
Limiting: Benzene
Excess: Oxygen
Percent yield: 86.71%