This work was created by Dr Jamie Love and licensed under a Creative Commons Attribution-ShareAlike 4.0 International License Creative Commons Licence.

WATER
Self Evaluation Test

This is very similar to your AIR Exam. Choose the best answer by selecting one of the buttons.
When you choose an answer you will get a "pop-up" response indicating whether you got it right or wrong. I suggest that the first time you take the test, you simply stick with your original answers, complete the test and submit it for a grade. This will give you an idea of what you have learned so far and is more like a "regular" test (whatever that is). Your answers will be graded and each one will be scored Correct or Wrong. Once you have the score and the list of incorrect answers you can use your "Back Button" to return to your exam and correct your errors. This time, this second time, you can carefully read each response, learn from it and choose the right answer. Students receiving a perfect score will be awarded a Certificate of Completion.
Remember : on some browsers (like some Internet Explorers) when you use the page down button to scroll down you will end up shifting your checked answer to the next one down the line! If that happens to you, use your mouse to scroll - not the keyboard.


WATER 1 : H2O is an example of ...

an element.
elemental molecule.
a liquid.
compound molecule.

WATER 2 : H2O is an example of a ...

monatomic molecule.
diatomic molecule.
triatomic molecule.
quadatomic molecule.

WATER 3 : The molecule 2H2O is a special kind of water. What is special about it?

One of the hydrogen atoms is the heavier isotope with two neutrons.
Both of the hydrogen atoms are the heavier isotope with two neutrons in each.
It is really a double water molecule.
It will boil faster than regular H2O.

WATER 4 : Covalent bonds are formed ...

by the sharing of pairs of electrons between two atoms.
by the transfer of one (or more) electrons between two atoms.
due to the "supersharing" of electrons among all the atoms.
between carbon and cobalt.

WATER 5 : How many sulfurs are in the molecule Al2(SO4)3

One.
Two.
Three.
Four.

WATER 6 : How many total atoms are in the molecule Al2(SO4)3?

Two.
Three.
Twelve.
Seventeen.

WATER 7 : Atoms form bonds in an effort to ...

balance the positive and negative charges.
obtain the electronic configuration of a noble element, with a complete (outer) shell.
make the smallest bonds possible.
make molecules.

WATER 8 : Electrovalent bonds are more likely to form between ...

two very electronegative elements.
two poorly electronegative elements.
a very electronegative element and a poorly electronegative element.
atoms that super share their electrons.

WATER 9 : Which one of these bonds is considered a weak bond?

Van der Waals bonds.
Covalent.
Electrovalent.
Metallic.

WATER 10 : A polar bond is formed ...

between polar molecules.
by an uneven distribution of the electrons the bond shares.
by polar molecules.
by ionic bonds.

WATER 11: Apolar solvents (like oil) ...

are bad at dissolving substances with a charge.
are hydrophobic.
are hydrophobic and bad at dissolving substances with a charge.
are hydrophilic.

WATER 12 : When a substance is heated and changes its state from that of a solid to a liquid ...

it's intra-molecular bonds are destroyed.
it's inter-molecular bonds are destroyed.
it changes from a hydrophobic to a hydrophilic substance.
electrons shift to different shells.

WATER 13 : Rules of VSEPR are used to predict the arrangement of atoms in molecules shaped by ...

electrovalent bonds.
metallic bonds.
hydrogen bonds.
covalent bonds.

WATER 14: Chlorine (Cl) has 17 protons and sodium (Na) has 11 protons. What type of bond will be created and what will be the ratio of these two elements in a compound made of them?

Covalent bonds will hold one sodium to one chlorine.
Electrovalent (ionic) bonds will hold one sodium to one chlorine.
Covalent bonds will hold one sodium to two chlorine.
Electrovalent (ionic) bonds will hold one sodium to four chlorine.

WATER 15 : Nitrogen (N) has 7 protons, chlorine (Cl) has 17 protons and sodium (Na) has 11 protons. Choose the correct formulas that show the correct number of hydrogen atoms that will bind to each of them?

NH3, HCl and NaH.
NH3, HCl and Na will not bond at all to H.
NH5, H2Cl and NaH2. None of these molecules is written correctly!
NH, HCl and NaH

WATER 16 : Methanol (also called "methyl alcohol" or "wood alcohol") has the molecular formula CH4O. What is the best Lewis structure?

Note : I have made this more difficult by using the same symbol for ALL the electrons. I have done this because if I were show you where each came from, it would be too easy! This way, you have to draw each structure, using electrons that you assign, to find the correct answer.
A.
B.
C.
D.

WATER 17 : What is the best Lewis structure for HNO2?

(This is a hard one! Think about it.)
A.
B.
C.
D.

WATER 18 : Consider VSEPR. The four repulsive axes commonly formed by an atom with a complete outer shell making single bonds (like the carbon in CH4) are arranged as ...

a sphere.
pairs of repulsive axes forming a linear connection.
three axes forming a triangle and one point straight up above the triangle.
four repulsion axes forming a tetrahedron.

WATER 19 : After you have arranged the axes to their most favorable position you must then reassign the (non-equal) axes to take into account differences in electrostatic repulsion. Which of the axes below would have the most repulsion?

An odd (single) electron.
Lone pairs.
Bond pairs.
All of these have the same repulsive power.

WATER 20 : Using VSEPR theory, chose the correct shape of H2S.

A.
B.
C.
D.


You can now submit your exam to Merlin for grading. If your answers were less than perfect you will receive a score and a list of Incorrect (and Correct) replies. Then you can use your "Back Button" to return to this page and correct your earlier errors. Once you have corrected all your earlier errors (by rechoosing a correct answer when you were told you are wrong), you will get a perfect score.


This work was created by Dr Jamie Love and licensed under a Creative Commons Attribution-ShareAlike 4.0 International License Creative Commons Licence.