chemistry

In which of the following pairs of compounds are both members of the pair ionic compounds? Explain
a. Pl3 and HBr
b. H2S and NCl3
c. LiF and H20
d. LiI and NiO

DrBob222 you said you would choose the answer d and I should know how to figure this out. I don't understand the pair ionic compounds. Can you please explain it to me in lay-man terms. I'm slooow
Thanks

  1. 👍
  2. 👎
  3. 👁
  1. The idea of predicting which is ionic, which covalent, which polar covalent depends upon some man made definitions and how to interpret them.

    Look up the value for the electronegativity (EN) for each element. If the difference is about 1.9 or so it is about 50% covalent/50% ionic bond. Generally, if it is more than 1.9 we call it an ionic bond; if less than 1.9 we call it a covalent bond. This number of 1.9 varies with instructors so you should know what your prof uses.(I know some use 1.7.) Also, some profs like to point out that a difference of zero is a pure covalent bond(H2, O2, N2 are example) while values between zero and 1.9 are not strictly covalent but not ionic either so those are called polar covalent. To show the examples above, here are the EN values of some of them.
    P = 2.19
    I = 2.66
    so PI3 is not ionic so I need not even worry about HBr; however, to show it is covalent too H = 2.1 and Br = 2.96 diff = <1

    b. Both are covalent. You can go through the drill to confirm that.

    c. Li is about 1; F is 4.0; difference is 3 so it clearly is ionic. H2O, however, is not. H = 2.1; O = about 3.5 for diff of about 1.4 or so. This is not ionic but it is polar covalent.

    d. Li = about 1
    I = about 2.66
    diff = about 1.7

    Ni = about 1.9
    O = about 3.5
    diff = about 1.4

    Strictly speaking none of these meet the criteria of BOTH being ionic by the criteria I use. I looked at them and knew the answer couldn't be a,b,or c so I figures d without looking up the values. You need to take the above information, use the tables your prof is using as well as his/her definition of ionic/covalent bond (the difference of EN values) and re-evaluate each based on the values your prof used.
    Note: If your prof uses 1.7 and the EN values in his/her table varies a little (Li = 1 and I = 2.7 diff = 1.7
    Ni = 1.8 and 3.5 diff = 1.7
    that would make d the answer.

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. CHEM

    In which of the following pairs of compounds are both members of the pair molecular compounds? PCl3 and LiBr CCl4 and KOH NaH and CaF2 Please explain. thank you so much

  2. chem (science)

    Which of the following pairs of elements are likely to form ionic compounds: A) helium and oxygen B) magnesium and chlorine C) chlorine and bromine D) potassium and sulfur E) sodium and potassium F) nitrogen and oxygen I believe

  3. Chemistry

    Which of the following will dissolve in polar solvents? a) non-polar solvents and ionic compounds b) ionic compounds and polar covalent compounds c) non-polar solvents and covalent compounds d) All of the above

  4. chemistry

    In which of the following pairs of ionic compounds are both members of the pair soluble in water? a.AgNO3 and AgCl b.LiOH and Li2SO4 c.PbSO4 and BaCO3 d.NH4I and Sn3(PO4)2

  1. Chemistry (please check)

    1)Which of the following compounds has the largest lattice energy: LiF LiCl NaF NaCl 2)Which of the following compounds has the most ionic character in its bonding: CaBr2 GeBr4 KBr GaBr3 3)Using the electronegativity table on page

  2. Chemistry

    Classify the substances as atomic elements, molecular elements, molecular compounds, or ionic compounds. CO2, HCl, Al2S3, Cd, F2,Ag,O2,NaCl

  3. Chemistry

    Regarding "hydrogen" bonding How come the compounds CH2O and CH3OCH3 do not exhibit hydrogen bonding, as opposed to compounds like CH3CH2OH and CH3NH2? It's indicated in my solutions manual that the two compounds that don't

  4. Science URGENT!!!

    Mulitple choice: why is it uncommon to draw lewis diagrams for ionic compounds? A.) Lewis diagrams can only illustrate covalent bonding B.) ionic compounds cannot be represented by Lewis diagrams C.) ionic compounds involve

  1. chemistry

    Which of the following statements concerning differences between ionic and molecular compounds is correct? Molecular compounds contains two elements, and ionic compounds contain three of more elements ionic compounds contain

  2. chemistry

    describe the structure of ionic compounds

  3. Chemistry

    Of the compounds below,_____ has the smallest ionic separation and why? A.RbF B.K2S C.SrBr2 D.KF E.RbCl --> How does one determine if a compound has a high or low ionic separation, and what is ionic separation?

  4. Science

    Table salt has the chemical formula NaCl. Table sugar has the chemical formula C12H22O11. Which of the following is true? (1 point) Both compounds are held together by chemical bonds. Both compounds have the same density. Both

You can view more similar questions or ask a new question.