GENERAL CHEMISTRY EXAM 1
LECTURE QUESTIONS AND
ANSWERS
Units of Measure - Correct Answers -giga (G): 10^9
mega (M): 10^6
kilo (K): 10^3
deci (d): 10^-1
centi (c): 10^-2
mili (m): 10^-3
micro (u): 10^-6
nano (n): 10^-9
pico (p): 10^-12
Density - Correct Answers -Density = Mass / Volume
Units= Solids and Liquids is g/cm^3 = g/ml, Gases is g/L (cm^3=1ml)
Intensive Property: Property that does not depend on the amount, ex, density
Extensive Property: Depends upon the amount ex, mass
Law of Conservation of Mass & Definite Proportions - Correct Answers -Laws of
Conservation of Mass: In a chemical reaction, matter is neither created or destroyed. 2
H2 + 02 -> 2 H20
Law of Definite Proportions: All samples of a given compound, regardless of the source
or how prepared, have the same proportions of their constituent element. H20 is always
8 parts oxygen to one part hydrogen. NH3 is always 4.7 parts N to 1 part H.
Rutherford Conclusion - Correct Answers -Most of an atom's mass and all of its charge
is contained in a small cone called a Nucleus. Most of the volume of an atom is empty
space, negatively charged electrons are dispersed in the space. An atom is electrically
neutral, it has an equal number of protons and electrons.
Significant Figures - Correct Answers -Non-zero digits are always significant
Zeros between nonzero digits are always significant.
Leading zeros are never significant
Zeros at the end of a number are significant if the number contains a decimal.
LECTURE QUESTIONS AND
ANSWERS
Units of Measure - Correct Answers -giga (G): 10^9
mega (M): 10^6
kilo (K): 10^3
deci (d): 10^-1
centi (c): 10^-2
mili (m): 10^-3
micro (u): 10^-6
nano (n): 10^-9
pico (p): 10^-12
Density - Correct Answers -Density = Mass / Volume
Units= Solids and Liquids is g/cm^3 = g/ml, Gases is g/L (cm^3=1ml)
Intensive Property: Property that does not depend on the amount, ex, density
Extensive Property: Depends upon the amount ex, mass
Law of Conservation of Mass & Definite Proportions - Correct Answers -Laws of
Conservation of Mass: In a chemical reaction, matter is neither created or destroyed. 2
H2 + 02 -> 2 H20
Law of Definite Proportions: All samples of a given compound, regardless of the source
or how prepared, have the same proportions of their constituent element. H20 is always
8 parts oxygen to one part hydrogen. NH3 is always 4.7 parts N to 1 part H.
Rutherford Conclusion - Correct Answers -Most of an atom's mass and all of its charge
is contained in a small cone called a Nucleus. Most of the volume of an atom is empty
space, negatively charged electrons are dispersed in the space. An atom is electrically
neutral, it has an equal number of protons and electrons.
Significant Figures - Correct Answers -Non-zero digits are always significant
Zeros between nonzero digits are always significant.
Leading zeros are never significant
Zeros at the end of a number are significant if the number contains a decimal.
