Science: Practice Test Flashcards
A star suddenly increases in brightness then fades from view
Supernova
Colored lights that appear in the sky near the north and south poles
Aurora
Objects tendency not to change position or direction unless an outside force acts upon it
Inertia
Measures mass
Balance
Mass flow rate measured in
Grams per second
Bases have a pH btwn
7 and 14
Breaking a substance down without changing the composition of the substance
Mechanical weathering ( breaking a substance down without changing the composition)
Example of a physical change
Water become ice ( ice can turn back into water)
Earth takes _ to rotate on its axis
24 hours
Moon takes _ to revolve around the earth
One month
Earth takes _ to revolve around the sun
One year
A rainbow demonstrates
Refraction( bends light of the sun)
Echo is example of
Sound reflection
Mirror demonstrates
Light reflection
Sound waves reflecting off layers of earths atmosphere
Radio
_ orbits the earth
Moon
Only star in our solar system
Sun
Caused by earthquake on ocean floor
Tsunami
Space weather - huge explosions on the sun
Solar flares
Makes up 78% of earths atmosphere
Nitrogen
Smallest unit of an element
Atom
Two or more atoms, simplest form of a compound
Molecule
Electrically charged atom or group of atoms
Ion
Amount of matter in an object
Measure of gravitational pull on an object
Mass
Weight
Found in earths crust, essential to plant growth
Element most common in universe
Potassium
Carbon
What substance neutralizes an acid spill
What substance neutralizes a base spill
Sodium bicarbonate
Citric acid
When fossil fuels are burned they form
Carbon dioxide
Warm air moves into cold air mass
Cold air over into warm air mass
Unstable air
Warm front
Cold front
Tornado
Contour line indicating locations of equal barometric pressure
Isobar
Part of earth where life exists, included atmosphere, oceans, life supporting areas above or below earths surface
Biosphere
Velocity x mass =
Bicep curl
Momentum
Insulators (3)
Thermal conductor
Plastic, rubber, porcelain
Aluminum
Filter waste from the cell in the cytoplasm
Lysosomes
Part of atom flows through circuit to power a lightbulb
Electrons
_ are atoms that have lost or gained electrons and have a charge
Ions
Sandstone is a type of _ rock
Sedimentary rock
Endothermic animals (2)
Birds and mammals
One organism benefits from another without causing harm to the host organism
Commensalism
Magnets readily attract _
Iron
_ refers to the layers of gases that surround the the earth
Atmosphere
Temperature , pressure and density _ as altitude increases
Decrease
Book sitting on a table is an example of
Gravitational potential energy
Two negatives charges will
Repel each other
Process of plants making glucose called?
Calvin cycle
