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September 1, 2014

Posts by Iby


Total # Posts: 5

mathematics
the average age of a family of six is 25 years.The average age of the four children is 15 years.If the father is 2 years older than the mother,calculate the age of the mother.
October 23, 2010

chemistry
What is the carbonate-ion, CO3-2, concentration in a 0.037 M carbonic acid solution? a. 1.2 ´ 10-4 b. 4.2 ´ 10-7 c. 7.6 ´ 10-8 d. 4.8 ´ 10-11 e. 5.2 ´ 10-19
May 14, 2010

Chemistry
When all the following solutes act as acids, the one with the weakest conjugate base is a. H2SO3. b. H2CO3. c. HClO4. d. HClO. e. HF. 4. (Points: 1) A sample of ammonia (Kb = 1.8 * 10^-5) is titrated with 0.1 M H2SO4. At the equivalence point, the pH is approximately a. 1. b. ...
May 13, 2010

Chemistry
Which of the following can we predict from an equilibrium constant for a reaction? 1 The extent of a reaction 2 Whether the reaction is fast or slow 3 Whether a reaction is exothermic or endothermic a. 1 only b. 2 only c. 3 only d. 1 and 2 only e. 1 and 3 only 2. (Points: 1) ...
May 13, 2010

Chemistry
Which of the following can we predict from an equilibrium constant for a reaction? 1 The extent of a reaction 2 Whether the reaction is fast or slow 3 Whether a reaction is exothermic or endothermic a. 1 only b. 2 only c. 3 only d. 1 and 2 only e. 1 and 3 only 2. (Points: 1) ...
May 13, 2010

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