Science Flashcards
(188 cards)
An eclipse of the sun throws the shadow of the
moon on the earth
Substances that hasten a chemical reaction without themselves undergoing change are called
Catalysts
Lack of iodine is often related to what disease
Goiter
Under natural conditions, large quan of organic matter decay therefore
soils maintain their fertility
The thin layer that forms the front of the eyeball is called the
Cornea
The most likely reason why dinosaurs became extinct was that they
Failed to adapt to a changing environment
Which of the following is a chemical change
Burning one pound of coal
A person with high blood pressure should
avoid salt
The chief nutrient in lean meat is
Protein
Spiders can be distinguished from insects by the fact that spiders have
four pairs of legs
An important ore of uranium is called
Pitchblende
Of the following the lightest element known on earth is
hydrogen
Of the following gases in the air, the most plentiful is
nitrogen
The time it takes for light from the sun to reach the earth is approximately
8 minutes
Of the following types of clouds, the ones that occur at the greatest height are
Cirrus
New drug test. Group A takes drug. Group B takes sugar pill. Group B called
An experimental control
After adding salt to water, the freezing point of the water is
lowered
Radium is stored in lead containers because
the lead absorbs the harmful radiation
The type of joint that attaches the arm to the shoulder blade is the
Ball and socket
Limes were eaten by British sailors in order to prevent
Scurvy
The time that it takes for the Earth to rotate 45 degrees is
3 hours
Of the following planets, the one that has the shortest revolutionary period around the sun is
Mercury
What is the negative particle that circles the nucleus of the atom
Electron
In the International System of Units, a measurement for mass is a
kilogram