1) Balance the chemical equation when aqueous ammonium phosphate and aqueous cal
ID: 792222 • Letter: 1
Question
1) Balance the chemical equation when aqueous ammonium phosphate and aqueous calcium choloride are mixed. What is the sum of the coefficeints?
A. 8
B. 9
C. 11
D. 12
2) What mass of the compound chromium trioxide (100g/ mol) contains 4.5 x 10 ^23 oxygen atoms?
A. 2.25g
B.12.0g
C.25.0g
D.75.0g
3) 30.0 mL of 0.10M calcium nitrate and 15.0 mL of 0.20M sodium phosphate are mixed. After the reaction is complete, how much precipitate is formed?
A. 1.0 x 10^-3 moles
B.1.5 x 10^-3 moles
C.6.0 x 10^-3 moles
D.3.0 x 10^-3 moles
4) Which of the following is a redox reaction?
A. Octane (C8H18) plus oxygen yields carbon dioxide and water
B. hydroiodic acid plus barium hydroxide yields water and barium iodide
C. both are redox reactions
D. neither are redox reactions
5) which compound/ion has the atom with the highest (most positive) oxidation number?
A. Hydronium ion
B. Chloric acid
C. Dinitrogen tetroxide
D. Ammonium sulfate
6) which compound is a weak electrolyte?
A. Ammonia
B. Hydrofluoric acid
C.both ammonia and hydrofluoric acid
D.neither ammonia nor hydrofluoric acid
7) Which compound shen dissolved in water releases the most ions? There is one mole of each of the compounds.
A. Sodium carbonate
B. Carbonic acid
C. Pottasium dichromate
D. Aluminum nitrate
Explanation / Answer
1)2(NH4)3PO4(aq) + 3CaCl2(aq) ==> Ca3(PO4)2(s) + 6NH4Cl
ANSWER IS 12...D
2)100G>>>>>>6 *10^23 *3
X>>>>>>>>>>4.5 *10^23
X=25gm
3)
2Na3PO4 + 3Ca(NO3)2--->6NaNO3 + Ca3(PO4)2
millimoles of Na3PO4==3
millimoles of Ca(NO3)2 ==3
1 milli mole of ppt is formed
ANSWER IS A
4)
2 C8H18 + 25 O2 = 18 H2O + 16 CO2
OXYGEN IS REDUCED AND CARBON IS OXIDISED
ANSWER IS A
both are weak electrolytes as IONIZATION CONSTANTS ARE VERY LESS
ANSWER IS C
7) Al(NO3)3
IT RELEASES 4 IONS
SO ANSWER IS D
Hydrofluoric Acid HF 6.8 x 10-4Related Questions
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