CHEM 121 FINAL EXAM | UPDATED QUESTIONS AND
ANSWERS UPDATED .Buy Quality Materials!
According to Dalton, atoms are all:
indivisible
A 100 g sample comprised of molecule (A) is made up of 57.1 g of oxygen and
42.9 g of carbon. Another 100 g sample comprised of molecule (B) is made up of
72.7 g oxygen and 27.3 g carbon. The ratio of oxygen: carbon mass ratios
between the two molecules is 2:1. Which law is demonstrated in this calculation?
the law of multiple proportions
Given the following reaction: 8CO+17H2→ _________+_________ . Which of the
following are products that do not violate any of Dalton's postulates?
C8H18+8H2O
A sample of an unknown substance contains 1.0 grams of copper and 0.558
grams of chlorine, while a different sample of that same substance contains 2.0
grams of copper and 1.116 grams of chlorine. Which law does this observation
demonstrate?
the law of definite proportions
Given the following reaction: 2AgI+Na2S→ _________+ _________. Which of the
following products do not violate any of Dalton's postulates?
Ag2S+2NaI
A sample of ethyl alcohol has the following percentages of elements: 35% O, 52%
C, and 13% H. If a third of the sample was to evaporate, what will the new
percentages be?
35% O, 52% C, and 13% H (the law of definite proportions)
Dalton's theory views a chemical change as:
a rearrangement of atoms, to form new combinations, or new compounds
Which will have a greater mass of hydrogen, a 10.0 gram sample of water, or a
20.0 gram sample of water?
the 20.0 g sample
According to Dalton's theory, atoms of a given element are:
identical in mass, extremely small, different from atoms in other elements
that two elements can react to form more than one compound, but a fixed mass
of one element will react with masses of the other element in small, whole
number ratios is stated in the:
law of multiple proportions
what subatomic particle determines the element
protons
Every element on the periodic table has isotopes that contain:
ANSWERS UPDATED .Buy Quality Materials!
According to Dalton, atoms are all:
indivisible
A 100 g sample comprised of molecule (A) is made up of 57.1 g of oxygen and
42.9 g of carbon. Another 100 g sample comprised of molecule (B) is made up of
72.7 g oxygen and 27.3 g carbon. The ratio of oxygen: carbon mass ratios
between the two molecules is 2:1. Which law is demonstrated in this calculation?
the law of multiple proportions
Given the following reaction: 8CO+17H2→ _________+_________ . Which of the
following are products that do not violate any of Dalton's postulates?
C8H18+8H2O
A sample of an unknown substance contains 1.0 grams of copper and 0.558
grams of chlorine, while a different sample of that same substance contains 2.0
grams of copper and 1.116 grams of chlorine. Which law does this observation
demonstrate?
the law of definite proportions
Given the following reaction: 2AgI+Na2S→ _________+ _________. Which of the
following products do not violate any of Dalton's postulates?
Ag2S+2NaI
A sample of ethyl alcohol has the following percentages of elements: 35% O, 52%
C, and 13% H. If a third of the sample was to evaporate, what will the new
percentages be?
35% O, 52% C, and 13% H (the law of definite proportions)
Dalton's theory views a chemical change as:
a rearrangement of atoms, to form new combinations, or new compounds
Which will have a greater mass of hydrogen, a 10.0 gram sample of water, or a
20.0 gram sample of water?
the 20.0 g sample
According to Dalton's theory, atoms of a given element are:
identical in mass, extremely small, different from atoms in other elements
that two elements can react to form more than one compound, but a fixed mass
of one element will react with masses of the other element in small, whole
number ratios is stated in the:
law of multiple proportions
what subatomic particle determines the element
protons
Every element on the periodic table has isotopes that contain:
