Conversions
Significant Digits
Lab Equipment
Properties of Matter
Science
100
How many kilograms are in one milligram?
.000001 kg
100
Provide 3 sig figs for the number of students at Lambert, which is 2912 students.
2910 students.
100
What is an Ehrlenmeyer Flask?
100
when a substance is transformed into one or more different substances, at a molecular level.
What is a chemical change?
100
The branch of science that deals with the properties, composition, and structure of elements and compounds, how they can change, and the energy that is released or absorbed when they change.
What is chemistry?
200
Covert 400 meters to miles.
1 km = .62 mi
.248 mi
200
Provide 3 sig figs for the number of stars in the milky way, which is 100 billion.
What is 1.00 x 1011 stars?
200
What is a graduated cylinder?
200
State of matter characterized by structural rigidity and resistance to a force applied to the surface.
What is a solid?
200
The variable a scientist changes in an experiment.
What is the independent variable?
300
A miniature snorkeler has a mass of 20 g. Calculate the volume of the scuba diver.
What is 8 mL?
300
Provide 4 sig figs in standard notation for the number of humans on Earth:
7.75358693 x 109 humans
7,754,000,000 humans
300
What is a beaker?
300
The only state with a definite volume but no fixed shape
What is a liquid?
300
An explanation of an aspect of the natural world and universe that has been repeatedly tested and corroborated in accordance with the scientific method, using accepted protocols of observation, measurement, and evaluation of results.
What is a scientific theory?
400
If you find a metallic rock with a density of 8.07 g/mL and a mass of 65,000 mg, what is the volume of the rock?
What is 8.05 mL?
400
Perform the following operation to the correct number of significant figures. Give the answer in standard notation.
How many habitable planets are in the Milky Way Galaxy?
There are 1.00 x 1011 stars, and each star has an average of 1.5 planets, and 5.35% of the planets are habitable.
8,030,000,000 habitable planets
400
What is a ring stand?
400
changes affecting the form of a chemical substance, but not its chemical composition.
What is a physical change?
400
The most abundant element in Earth's atmosphere.
What is Nitrogen?
500
How many inches are in a 5 km cross country race, in scientific notation?
1 km = .62 mi
1 mi = 5280 feet
1.96 x 105 in
500
Solve for N, the number of alien civilizations in our galaxy with which communication might be possible. Be sure to use the correct number of significant figures in your answer.
The Drake equation is:
N = the number of civilizations in our galaxy with which communication might be possible
and
R∗ = 2 stars per year = the average rate of star formation in our Galaxy
fp = 1 = the fraction of those stars that have planets
ne = 0.4 = the average number of planets that can potentially support life per star that has planets
fl = .95 = the fraction of planets that could support life that actually develop life at some point
fi = .5 = the fraction of planets with life that actually go on to develop intelligent life (civilizations)
fc = 0.1 = the fraction of civilizations that develop a technology that releases detectable signs of their existence into space
L = 420 years = the length of time for which such civilizations release detectable signals into space
20 civilizations
500
What is a bunsen burner?
500
State of matter in which particles spread apart or diffuse in order to homogeneously distribute themselves throughout any container.
What is a gas?
500
The age of Earth, +/- 100 MY.
What is 4.55 billion years old?