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1. Write correct formulae for the following:
a) sodium chloride
b) calcium bromide
c) aluminum sulfide
d) magnesium sulfate
e) phosphoric acid
2. Using the electron dot formulae (Lewis structures) with only the valence electrons, show the bonding in:
a) beryllium chloride
b) ammonia (NH3)
c) methylene chloride (CH2Cl2)
d) calcium chloride
e) acetylene (C2H2)
3. Balance the following chemical equations:
a) K2CO3 + HNO3 →KNO3 + CO2 + H2O
b) KClO3 →KCl + O2
4. Write balanced equations for the following: (3 marks each)
a) sodium + chlorine gas (Cl2) →sodium chloride
b) nitric acid + calcium hydroxide →calcium nitrate + water
A solution is made by mixing 30.0 mL of ethanol, C2H6O, and 70.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 °C. Ethanol density=0.789 Vapor Pressure (Torr)=43.9 Water density=0.998 Vapor Pressure (Torr)=..
In a cell constructed between a compartment containing a zinc electrode immersed in a 0.1 M ZnSO4 (aq) solution and a compartment containing a copper electrode immersed in a 0.1 M CuSO4 (aq) solution,
Complete the following reactions by replacing the question mark with the appropriate formula. Choose the correct enzyme or enzyme class.
The solubility of barium carbonate,BaCO3, is .0100 g/L . Its molar mass is 197.6 . What is the Ksp of barium carbonate?
A flask contains 0.330 mol of liquid bromine, Br2. Determine the number of bromine molecules present in the flask.
What is the maximum mass, in gram, of Fe3O4, that can be produced from this reaction? B)If 3.26 g of Fe3O4 are actually made, what is the percent yield of this process
Determine how much of each type of solution must be used to fill the prescription and Special eye drop solution for a glaucoma patient must have a 2% active ingredient, a pharmacist is to prepare 15ml of it but the he has 10% solution & 1% solution..
compound of carbon and oxygen contains 3.00g of carbon and 8.00g of oxygen, what is the mass percent of carbon in the compound?
What mass of solid sodium formate (of MW 68.01) must be added to 110 mL of 0.55 mol/L formic acid (HCOOH) to make a bu?er solution having a pH of 3.84? Ka = 0.00018 for HCOOH
2 FeS + 3 N2 → 2 FeN + 2 SN2 This reaction has a 65.0% yield. How much N2 is consumed if 13.6 g of FeN are produced?
Estimate the vapor pressure at temperatures of 273, 298, 363, 383, and 423 K respectively
A+B+C =D The rate law for this reaction is Rate=k [A][C] 2/[B]^1/2 Suppose the rate reaction at certain initial concentration of A, B, and C is 1.14*10^-2 M/s.
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