Grade 12 Chem - please check answer

The four possible unknown chemicals are: Cu(s), Ca(OH)2(s), KNO3(aq) and C6H12O6(aq).

a) colorless solutions, high electrical conductivity, no change on litmus paper
b)white crystals, no electrical conductivity, red to blue on litmus
c) shiny brown wire, high electrical conductivity, no change on litmus
d) colorless solution, low electrical conductivity, no change on litmus

I said:
a)C6H12O6(aq)
b)Ca(OH)2(s)
c)Cu(s)
d)KNO3(aq)

  1. 👍 0
  2. 👎 0
  3. 👁 123
asked by Laura
  1. I don't know but I assume C6H12O6 is glucose. It is a colorless solution but it doesn't conduct electricity since it doesn't ionize. Therefore, glucose can't be the answer for a).
    I suppose your answer is correct but if so it is a flawed question because Ca(OH)2(s)is a solid and will not turn litmus paper unless some water is added.
    I think c probably is correct although I don't think of copper wire as being brown. It does have a brownish cast if slightly oxidized from air.
    You answer of KNO3(aq) for d can't be correct for KNO3(aq) is a 100% ionized and conducts electricity very well.

    1. 👍 0
    2. 👎 0
    posted by DrBob222

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    The vapor pressure of pure water at 90celsius is normally 525.8 but decreased 483mmHg upon addition of an unknown amount of KNO3 to 286.9g H2O at this temperature. how many grams KNO3 were added. ASSUME COMPLETE DISSOCIATION OF

    asked by Jude on April 24, 2011
  2. College Chemistry

    please help! You are given an unknown, colorless, solution that may contain only one salt from the following set: NaA, NaB, NaC. In solution each salt dissociates completely into the Na+ ion and the anion A-, B-, or C-, whose

    asked by Marcus on November 10, 2010
  3. Chemistry

    When solutions of KCl and Pb(NO3)2 are mixed, a precipitate forms. Which of the following is the balanced equation for the double replacement reaction that occurs? a. KCl(aq) + Pb(NO3)2 (aq) ¨ KNO3 (aq) + PbCl2 (s) b. KNO3 (aq)

    asked by Z on November 30, 2012
  4. Chemistry

    You have 2 chemicals A (solid), but you do not know the exact composition od either one of them. You do know that all together, there is SOME combination of sodium, barium, chloride and phosphate (PO4^-3) present. You disolve both

    asked by Anonymous on July 18, 2010
  5. chemistry

    (7 points) 1. The reaction that you just witnessed in while doing your titration was: HCl + NaOH  H2O + NaCl. This equation is balanced. Your unknown solutions contained HCl solutions of unknown concentrations, and your titrant

    asked by kat on March 21, 2016
  6. Chemistry

    Adding water to some chemicals can be dangerous because large amounts of heat are liberated. Which of the following does NOT liberate heat when water is added to it? KNO3 (the answer) NaOH Na CaO H2SO4 I guessed Na simply because

    asked by Confused on May 2, 2012
  7. Chemistry

    1a). If you react 16 mol A with 15 mol B in the reaction 4A + 3B → 2C, what is the limiting reactant? 1b). What is the theoretical yield of product C in mol? 3a.) If Pb(NO3)2 were the limiting reactant in this reaction:

    asked by Reza on June 5, 2018
  8. chemistry

    Which of the following would have the lowest vapor pressure? A. 0.8 m C6H12O6 B. 0.10 m C6H12O6 C. 0.05 m C6H12O6 D. 0.15 m C6H12O6 I think it is D... is that correct? Which of the following would have the lowest boiling point? A.

    asked by Christina on November 12, 2009
  9. chemistry

    Why are some solutions seen by the human eye with specific colors, while other solutions are observed to be colorless??

    asked by Anonymous on November 13, 2013
  10. Chemistry

    Why are some solutions seen by the human eye with specific colors, while other solutions are observed to be colorless??

    asked by Anonymous on November 13, 2013

More Similar Questions