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Questions
|
Answer |
Explanations |
11 Which type of bonding is found in all molecular
substances?
(1) covalent bonding (3) ionic bonding
(2) hydrogen bonding (4) metallic bonding |
1 |
molecular is covalent |
12 An aqueous solution of sodium chloride is best
classified as a
(1) homogeneous compound
(2) homogeneous mixture
(3) heterogeneous compound
(4) heterogeneous mixture |
2 |
solution is homogeneous |
13 What is the total number of electrons shared in a
double covalent bond between two atoms?
(1) 1 (3) 8
(2) 2 (4) 4 |
4 |
2 electrons = 1 bond |
14 Which formula represents a nonpolar molecule?
(1) H2S (3) CH4
(2) HCl (4) NH3 |
3 |
draw them, nonpolar is symmetrical |
15 What occurs when an atom loses an electron?
(1) The atom’s radius decreases and the atom
becomes a negative ion.
(2) The atom’s radius decreases and the atom
becomes a positive ion.
(3) The atom’s radius increases and the atom
becomes a negative ion.
(4) The atom’s radius increases and the atom
becomes a positive ion. |
2 |
lose electron become positive and
decrease in size |
16 Two samples of gold that have different temperatures
are placed in contact with one another.
Heat will flow spontaneously from a sample of
gold at 60°C to a sample of gold that has a
temperature of
(1) 50°C (3) 70°C
(2) 60°C (4) 80°C |
1 |
heat flows from hot to cold |
17 Under which conditions of temperature and
pressure would helium behave most like an ideal
gas?
(1) 50 K and 20 kPa (3) 750 K and 20 kPa
(2) 50 K and 600 kPa (4) 750 K and 600 kPa |
3 |
ideal gas=ideal vacation
high temp and low pressure |
18 A sample of oxygen gas is sealed in container X.
A sample of hydrogen gas is sealed in container Z.
Both samples have the same volume, temperature,
and pressure. Which statement is true?
(1) Container X contains more gas molecules
than container Z.
(2) Container X contains fewer gas molecules
than container Z.
(3) Containers X and Z both contain the same
number of gas molecules.
(4) Containers X and Z both contain the same
mass of gas. |
3 |
same volume under the same
conditions same number of molecules
Avagodro's Hypothesis |
 |
2 |
unsaturated=double or triple bonded
hydrocarbon= only hydrogen and carbon |
 |
1 |
5 carbons pent-
double bond -ene
at the second carbon 2- |