Posts by khin

Total # Posts: 14

  1. chemistry

    how can i know whether solution is acidic or not and then what type of acid?
  2. chem

    sorry . Can you please help me with this questions If you know? Oxalic acid is a relatively strong diprotic acid with Ka1 = 5.6 ´ 10-2 and Ka2 = 5.1 ´ 10-5. What is the C2O42- concentration in a solution that is 0.10 M in oxalic acid and 1.0 M in HCl? (Consider ...
  3. chemistry

    Chloroacetic acid has a relatively large equilibrium constant, so at low acid concentrations it is necessary to use the quadratic equation in order to calculate the concentrations of the aqueous species. Ka for ClCH2COOH is 1.4 ´ 10-3. For the problems that follow, ...
  4. Chemistry

    Which of the following species would NOT function as an oxidizing agent? a. MnO4- b. Mn+2 c. H+ d. S e. Br-
  5. Chemistry

    Identify the spectator ion(s) in the following reaction: Cu(OH)2(s) + 2H+(aq) + 2Cl–(aq) Cu2+(aq) + 2Cl–(aq) + 2H2O(l) a. Cu2+ and Cl- b. H+ and Cl– c. Cu(OH)2 d. Cl– e. Cu2+
  6. chemistry

    What is the net ionic equation for the reaction of H2SO3 with Ba(OH)2?
  7. Chemistry

    C9H20 + 19/2O2 -> 9CO2 + 10H2O Please Can u find the physical states for this equation?
  8. Chemistry

    2NaHCO3 + H2SO4 ->Na2SO4 + 2H2O + 2CO2 Can u tell me physical states of the equation?
  9. Chemistry

    NaHCO3 + H2SO4 Na2SO4 + H2O + CO2 Use minimal integer numbers to balance the reaction. Include physical states in your answer.
  10. chemistry

    The figure below represents the bulls eye target for an archer. The black dots represent where the archer’s arrows hit: How can this archer be described? a. accurate b. precise c. accurate and precise d. neither accurate nor precise
  11. chemistry

    How many moles of O2 are needed to combine with 0.646 mol Al to give Al2O3?
  12. chemistry

    How many moles of O2 are needed to combine with 0.646 mol Al to give Al2O3?
  13. MATH

    10-___+9=59
  14. esl

    is practices (z or iz)