Mathematics
Convert 200 degrees Celsius to Kelvins
K = C + 273.15
K = C + 273.15
K = 200 + 273.15
K = 473.15 degrees Kelvin
What are two characteristics of a good hypothesis?
testability and reproducibility
What two particles are found in the nucleus of an atom?
proton and neutron
What is a group of two or more atoms linked together by chemical bonds?
A. element
B. mixture
C. molecule
D. phase
C. molecule
What measurement is this?
mass / volume
Double the points if you know the units it is measured in!
density
measured in g/mL or g/cm3
Convert 3.78 m to millimeters.
Double points to express it in scientific notation!
3.78 m * 1000 mm / 1 m = 3780 mm
3.78 x 103 mm
Which of the following is another name for the metric system?
F.P.S system
SI system
SI system
What number identifies an atom as a certain element?
A. mass number
B. atomic number
C. electron number
D. neutron number
B. atomic number
this is the number of protons in the atom
Which of the following is a homogenous mixture?
A. raisin bread
B. chicken noodle soup
C. apple juice
D. table salt
C. apple juice
The mixture contains water, sugars, and other dissolved compounds and is thoroughly mixed.
What two kinds of numbers have NO uncertainty?
(partial credit for naming at least one!)
numbers obtained by counting
numbers in conversion factors
How many significant figures are in the number
0.0003200798000
10
What is one limitation of science?
science can only study the physical universe
science cannot explain the human conscious
science cannot define morality
science can explain how something happens, but not why it happens that way
ex. why do two objects with mass attract each other? (gravity)
How does an atom become an ion with a POSITIVE charge?
A. it gains electrons
B. it gains protons
C. it looses electrons
D. it looses protons
C. it looses electrons
atoms can NOT loose protons!
Which of the following is NOT a chemical change?
A. eggs cooking
B. sugar dissolving in coffee
C. barbed wire rusting
D. charcoal burning
B. sugar dissolving in coffee
it's still sugar!
An object was measured four times with different rulers. The lengths were 15.0 cm, 15.1 cm, 14.9 cm, and 15.0 cm.
What description best fits this example?
A. high accuracy
B. low accuracy
C. high precision
D. low precision
C. high precision
the measurement is nearly the same each time
According to the rules for significant figures, to what number should the problem 3.2 x 7.4015 be rounded?
24
Multiplication and division are limited by number of sig figs. The number 3.2 only has 2 sig figs
Which type of chemist would most likely study alcohols, which consist of carbon, hydrogen, and oxygen?
A. inorganic chemist
B. organic chemist
C. physical chemist
D. analytical chemist
B. organic chemist
Which two subatomic particles are considered nucleons?
protons and neutrons
Why does a liquid become a gas at boiling point?
the kinetic energy of the particles of the liquid is greater than their attraction towards each other
Many biological reactions happen in less than a second. Very sensitive technology is needed to measure these changes in nanoseconds.
How many nanoseconds are in one millisecond?
1 ms * 1 s / 1000 ms * 1000000000 ns / 1 s
= 1000000 ns or 1 x 106 ns
The density of copper is 8.92 g/mL.
What is the volume of 454 g of copper?
Round your answer to the nearest 0.1 mL
d = m / v
v = m / d
v = 454 g / 8.92 g/mL
v = 50.9 mL
Name all 5 branches of chemistry.
physical chemistry
organic chemistry
inorganic chemistry
biochemistry
analytical chemistry
How many quarks make up a proton?
3
A scientist wants to analyze a particular cocktail to determine its alcoholic content. The cocktail is a homogenous mixture of alcohol and fruit juice (which is a mixture of water and dissolved sugars)
Which of the following would be the best method to separate only the alcohol from the cocktail?
A. paper chromatography
B. fractional crystallization
D. fractional distillation
D. fractional distillation
Since both water and alcohol will evaporate, the scientist needs to set up a fractional distillation and collect only the alcohol, which will evaporate and condense first.
DOUBLE JEOPARDY!!
A watt is a unit of power measured in Joules per second. Joules and Calories are both used to measure energy. If one oreo cookie contains approximately 53 Calories, how many oreos would it take to power a 60 watt bulb for 12 hours?
1 watt = 1 J / s 60 watts = 60 J / s
1 J = 0.000239 Cal
1 oreo = 53 Cal
12 hr * 60 min / 1 hr * 60 s / 1 min * 60 J / s * 0.000239 Cal / 1 J * 1 oreo / 53 Cal
= 11.69 oreos
about 12 oreos