Question

1. Balance the following equation

   KClO₃   → KCl + O₂

   The sum of the coefficients is

   		5
   		6
   		7
   		13

1. Which one of the compounds is polar ?

     Electronegativity H  = 2.1

     Electronegativity C  = 2.5

     Electronegativity N  = 3.0

   Electtronegativity Cl = 3.0

   Electronegativity O = 3.5

   		CH4
   		CCl4
   		NH3
   		CO2

1. Balance the following redox reaction the coefficient in front of OH^- is

   Zn + NO₃^-   → Zn²⁺ + NH₃ ( basic solution)

   		3
   		4
   		8
   		9

1. Calculate the density of CO₂ gas at  100.^oCand a pressure of 1.10 atm.

   		1.58 g/L
   		3.06 g/L
   		5.90 g/L
   		3.57 g/L

1. What is the final volume of a gas. If initially it has a pressure of 565 torr and a volume of 2.80 L, the pressure is then decreased to 450. torr ? Assume a constant temperature.

   		2.23 L
   		2.57 L
   		4.06 L
   		3.51 L

Answer 1

2 3 keloz kd +Oz Balanced: 2 Kolo, 2kd + 30 21243-1 6 City, Cely, co, are non-pelar; NH3 is polar. Zn + NO 3 24 2 + + WHz (Basic solution). Balanced: 42n + Nom + 640 & 42n + NH3 +901 answer is a ot density : d=? T= 100 c+273=373k. T = 273k. ķ> PV Belz T 2 >> V22 9 2 alatm.. P = 1.10 atm. 2 V, 222-4L. P, VI 2 TX PL 2 1/1 10 x 3736 6. T.TO 273k x 22.4 L = 27.82 L. D-mess volume & D- un 27.8 P = 565 fors 2 V 450 D2 1.589/4 = 450 fors; V, 22.80L; & = ? 565x 2.80 37 v2 = 3.514 .