Chem Check Please!!!

1) Which of the following statements is/are CORRECT?
1. Naturally occurring isotopes account for only a small fraction of known radioactive isotopes.
2. A few radioactive isotopes with long half-lives, such as U-235 and U-238, are found in nature.
3. Trace quantities of some short-lived radioactive isotopes, such as C-14, are found in nature because they are formed continuously by nuclear reactions.
a. 1 only
b. 2 only
c. 3 only
d. 1 and 2
e. 1, 2, and 3

Answer A


2) Ions such as [Co(H2O)6]3+ and [Ag(CN)2]– are called ____.
a. ligands
b. Lewis bases
c. chelates
d. alloys
e. coordination complexes

Answer E



3) All of the following molecules or ions can act as polydentate ligands EXCEPT ____.
a. phenanthroline; C12H8N2
b. acetylacetate ion; CH3COCHCOCH3–
c. oxalate ion; C2O42–
d. ethylenediamine; H2NCH2CH2NH2
e. dimethylamine; (CH3)2NH2

Answer E

4) What is the coordination number of the central metal ion in [Cr(en)2(OH)2]NO3? (en = H2NCH2CH2NH2)
a. 0
b. 2
c. 4
d. 6
e. 7

Answer D

5) What is the name of the compound having the formula [Cr(en)2(H2O)2]SO4?

a. dihydroxydiethlyenediamminechromate(... sulfate
b. diaquabis(ethylenediamine)sulfatochr...
c. bis(ethylenediamine)diaquachromium(I... sulfato
d. diaquabis(ethylenediamine)sulfatochr...
e. diaquabis(ethylenediamine)chromium(I... sulfate

Answer E

  1. 👍 0
  2. 👎 0
  3. 👁 65
  1. I disagree with 1.
    I agree with 2,3,4.
    I con't see all of the name typed on 5 but e is right if that is chromium IV.

    1. 👍 0
    2. 👎 0
    posted by DrBob222

Respond to this Question

First Name

Your Response

Similar Questions

  1. CHEMISTRY HELP !!!!

    Which of the following statements is/are CORRECT? 1. Naturally occurring isotopes account for only a small fraction of known radioactive isotopes. 2. A few radioactive isotopes with long half-lives, such as U-235 and U-238, are

    asked by Kimberly :( on May 6, 2014
  2. Chemistry

    There are three naturally occurring isotopes of the hypothetical element hilarium 41Hi, 42Hi, and 44Hi. The percentages of these isotopes are the following: Hilarium Natural Isotopes Abundance 41Hi 18.7% 42Hi 43.6% 44Hi 37.7% You

    asked by anonymous on August 22, 2016
  3. CHEMISTRY HELP ! Check Please!

    Calculate the cell potential, at 25 C, based upon the overall reaction Zn2+(aq) + 2 Fe2+(aq) -> Zn(s) + 2 Fe3+(aq) if [Zn2+] = 1.50 x 10-4 M, [Fe3+] = 0.0200 M, and [Fe2+] = 0.0100 M. The standard reduction potentials are as

    asked by JuYoung on May 8, 2014
  4. chemistry

    there are 3 naturally occurring stable isotopes of oxygen:O-16,O-17, O-18. there are 2 naturally occurring stable isotopes of hydrogen: H-1, H-2.how many different water molecules can be made using the various combination's of all

    asked by Navroz on October 23, 2010
  5. Chemistry

    Copper is composed of two naturally occurring isotopes: Cu−63 (69.170%) and Cu−65. The ratio of the masses of the two isotopes is 1.0318.

    asked by Vanessa on September 3, 2014
  6. Chemistry

    Naturally occurring copper is a mixture of two isotopes. One of these has 34 neutrons the other has 36. If the relative atomic mass of copper is 63.55 amu calculate the natural abundances (percentages ) of the two isotopes.

    asked by Rose on October 5, 2014
  7. chemistry

    Naturally occurring silicon exists as 3 isotopes: 28Si, 29Si, and 30Si, whose atomic masses are 27.9769, 28.9865, and 29.9838, respectively. The most abundant isotope is 28Si, which accounts for 92.23% of naturally occurring

    asked by Rinad on September 30, 2014
  8. chemistry

    Gallium is a metal with a wide variety of uses. Some of its applications include computer memory chips, light emitting diodes and lasers. Radioactive isotopes of gallium are used to image the human body and locate tumors.

    asked by billy on August 29, 2014
  9. Science Check Answer

    1. Which of the following is the correct definition of minerals? A) A naturally occurring, inorganic solid that has a crystal shape and definite chemical composition. B) A naturally occurring, inorganic solid that forms through

    asked by Tim on May 2, 2016
  10. Science

    1. Which of the following is the correct definition of minerals? A) A naturally occurring, inorganic solid that has a crystal shape and definite chemical composition. B) A naturally occurring, inorganic solid that forms through

    asked by Anonymous on May 3, 2016

More Similar Questions