polkadot

Most popular questions and responses by polkadot
  1. Art

    1. Which step did the artist clearly use when drawing this image? two vanishing points only orthogonal lines imagery in the background larger than in the foreground imagery in the foreground lighter than in the background 2. Because of the use of value

    asked on September 15, 2016
  2. Social Studies

    16. What was one reason for the establishment of the colony of Rhode Island? 17. How did Thomas Hooker act on his want for a colony with strict limits on government? 18. Why was the economy in the New England Colonies different from the economy in the

    asked on October 10, 2016
  3. Algebra

    1. Use the Distributive Property to simplify the expression. (-1) (4-c) 2. Use the Distributive Property to simplify the expression. 4 (2 x - 4) 3. Use the Distributive Property to simplify the expression (10+4y) 1/2 4. To which subsets of real numbers

    asked on October 14, 2016
  4. Algebra

    1. Use the Distributive Property to simplify the expression. (-1)(4-c) 2. Use the Distributive Property to simplify the expression. 4(2x -4) 3. Use the Distributive Property to simplify the expression. (10 + 4 y) 1/2 4. To which subsets of real numbers

    asked on October 7, 2016
  5. chem

    Can someone please help me by explaining and correcting me? 1) A 0.057M solution of a weak acid has a pH of 4.93. Determine the ionization constant, Ka, of the acid. a) 2.1 x 10^-4 b) 2.4 x 10^-9 c) 4.1 x 10^-8 d) 2.8 x 10^-7 e) 1.4 x 10^-10 -- To be

    asked on April 8, 2011
  6. chemistry

    Hello! Please correct me if I'm wrong. For the following compound, predict whether the solution is acidic, basic, or neutral and why: NH4Cl. a) acidic, NH4Cl is the salt of a weak base b) neutral because there is no hydrolysis c) acidic, NH4Cl is a strong

    asked on April 7, 2011
  7. chem -repost for bobpursley

    Posted by polkadot on Friday, April 8, 2011 at 8:46pm. Can someone please help me by explaining and correcting me? 1) A 0.057M solution of a weak acid has a pH of 4.93. Determine the ionization constant, Ka, of the acid. a) 2.1 x 10^-4 b) 2.4 x 10^-9 c)

    asked on April 9, 2011
  8. chemistry

    Can someone please explain how to do this question? A 0.057M solution of a weak acid has a pH of 4.93. Determine the ionization constant, Ka, of the acid. a) 2.1 x 10^-4 b) 2.4 x 10^-9 c) 4.1 x 10^-8 d) 2.8 x 10^-7 e) 1.4 x 10^-10 -- Well, to be honest, I

    asked on April 7, 2011
  9. chemistry

    Hello! Can someone please tell me if I am wrong here? For a reaction where rate = k (A)(B)^2, what factor will NOT change k? a) raising the temperature b) increasing concentration of A c) adding a catalyst d) none of these e) lowering the temperature -- I

    asked on April 7, 2011
  1. Social Studies

    Ms. Sue, your advice was perfect, as per usual.

    posted on November 4, 2016
  2. Social Studies

    These are 100% right. Thanks!

    posted on November 3, 2016
  3. social studies

    Religious freedom for Roman Catholics.

    posted on October 13, 2016
  4. Language Arts

    B, C, C is correct.

    posted on September 15, 2016
  5. chem -repost for bobpursley

    I confused the rate constant with Keq, silly me. k=Ae^(-Ea/RT) looking at that equation and given my options... the answer would be D, none of these. I believe that's right, I understand this much better now, thank you.

    posted on April 9, 2011
  6. chem

    I think I got the reasoning for 2), it is acidic because it is the salt made from a strong acid and a weak base, therefore it is A (salt of weak base), not C (the salt is neutral itself, but slightly acidic in a solution). I believe this is the right

    posted on April 8, 2011
  7. chem

    It's actually the end of my first year doing this topic hahah x) for 1) i got 2.4 x 10^-9 for the Ka value. I understand what i over looked, thank you. 2) Well i just get very confused when especially with salts, acids, and bases. NH4Cl(aq) dissociates

    posted on April 8, 2011