A molecule with a slight charge is?
ion
dipole
VSEPR
Mrs. G in her home lab made 444.0 grams of chocolate butter cream icing. Between licking the spoon only 404.0 grams made it on the cake. What is the percent yeild of icing actually on the cake.
90.99%
109.9%
9.009%
91%
The quantitive study of a chemical reaction is?
hydrates
stoichometry
molecular formula
CBr4 has the shape and angles of which molecular geometry?
pyramidal, 109 degrees
tetrahedral, 109.5 degrees
bent, 109 degrees
An ionic bond is associated with which of the following?
equal sharing of electrons
unequal sharing of electrons
the transfer of electrons
A covalent bonding is?
give and take of electrons
sharing of electrons
sharing of neutrons
How many non binding electron pairs are present in water?
0
1
2
4
The limiting reagent is the reagent that is used up______.
last
second
first
in excess
The correct ionic charge (oxidation number) for sulfate ion is?
1+
2+
1-
2-
WHich of the following pairs of elements would form a covalent bond?
Sulfer and Oxygen
Calcium and Fluorine
calcium and Iodine
The correct ionic charge (oxidation number) for calcium ion is....
1_
Formation of a positive ion is the result of an atom:
losing one or more protons
gaining one or more protons
losing one or more electrons
gaining one or more electrons.
The mechanism for ionic bond formation always involves the transeferring of
Electrons from non metal atoms to metal atoms
Electrons from metal to metal atom.
Electrons from metal atom to non metal atom
Electrons from non metal atom to non metal atom
For Group VA element, choose the appropriate number of valence electrons present-
1 valence electrons
5 valence electrons
3 valence electrons
Which pair of electrons has the greatest repulsion?
non binding and non binding
bonding and bonding
electronegativity increases-
down and to the right
up and to the right
down and to the left
Calculate the weight in grams of 15.5 moles of oxygen
172g
.969g
248g
496g
Elements in groups 2A and 7A of the periodic table would respectively be expected to form ions with charges of:
+2 and +7
-2 and -7
+2 and +1
+2 and -1
The "octet rule" relate to the number eight because:
Only atoms with 8 valence electrons undergo chemical reaction
Ions with charges +8 and -8 are stable
Atoms react to form compounds so that they contain 8 electrons in their outer shell.
For representative elements, valence electrons are those electrons located:
closest to the nucleus
in the outermost shell
in the outermost subshell
in s orbitals
Which of the following sets of elements is arranged in order of decreasing electronegativity?
O, S, As
Si, B , Cl
Br, Cl, P
