806752
Questão 1
Questão
A molecule with a slight charge is?
Responda
-
ion
-
dipole
-
VSEPR
Questão 2
Questão
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.
Responda
-
90.99%
-
109.9%
-
9.009%
-
91%
Questão 3
Questão
The quantitive study of a chemical reaction is?
Responda
-
hydrates
-
stoichometry
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molecular formula
Questão 4
Questão
CBr4 has the shape and angles of which molecular geometry?
Responda
-
pyramidal, 109 degrees
-
tetrahedral, 109.5 degrees
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bent, 109 degrees
Questão 5
Questão
An ionic bond is associated with which of the following?
Responda
-
equal sharing of electrons
-
unequal sharing of electrons
-
the transfer of electrons
Questão 6
Questão
A covalent bonding is?
Responda
-
give and take of electrons
-
sharing of electrons
-
sharing of neutrons
Questão 7
Questão
How many non binding electron pairs are present in water?
Responda
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0
-
1
-
2
-
4
Questão 8
Questão
The limiting reagent is the reagent that is used up______.
Responda
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last
-
second
-
first
-
in excess
Questão 9
Questão
The correct ionic charge (oxidation number) for sulfate ion is?
Responda
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1+
-
2+
-
1-
-
2-
Questão 10
Questão
WHich of the following pairs of elements would form a covalent bond?
Responda
-
Sulfer and Oxygen
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Calcium and Fluorine
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calcium and Iodine
Questão 11
Questão
The correct ionic charge (oxidation number) for calcium ion is....
Responda
-
1+
-
2+
-
1_
-
2-
Questão 12
Questão
Formation of a positive ion is the result of an atom:
Responda
-
losing one or more protons
-
gaining one or more protons
-
losing one or more electrons
-
gaining one or more electrons.
Questão 13
Questão
The mechanism for ionic bond formation always involves the transeferring of
Responda
-
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
Questão 14
Questão
For Group VA element, choose the appropriate number of valence electrons present-
Responda
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1 valence electrons
-
5 valence electrons
-
3 valence electrons
Questão 15
Questão
Which pair of electrons has the greatest repulsion?
Responda
-
non binding and non binding
-
bonding and bonding
Questão 16
Questão
electronegativity increases-
Responda
-
down and to the right
-
up and to the right
-
down and to the left
Questão 17
Questão
Calculate the weight in grams of 15.5 moles of oxygen
Responda
-
172g
-
.969g
-
248g
-
496g
Questão 18
Questão
Elements in groups 2A and 7A of the periodic table would respectively be expected to form ions with charges of:
Responda
-
+2 and +7
-
-2 and -7
-
+2 and +1
-
+2 and -1
Questão 19
Questão
The "octet rule" relate to the number eight because:
Responda
-
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.
Questão 20
Questão
For representative elements, valence electrons are those electrons located:
Responda
-
closest to the nucleus
-
in the outermost shell
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in the outermost subshell
-
in s orbitals
Questão 21
Questão
Which of the following sets of elements is arranged in order of decreasing electronegativity?
Responda
-
O, S, As
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Si, B , Cl
-
Br, Cl, P
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