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98 terms

SCIENCE FINAL!!

I only put the hardest questions in, obviously it's not all of them. It's a mixture from the 6 main study guides.
STUDY
PLAY
physical science
study of matter and energy
a hypothesis must be
testable and supported by evidence
a hypothesis is developed out of
experiments and observations
physical science is divided into
physics and chemistry
what doesn't involve physical science
social interactions between animals
biology
uses physical science to explain how the heart pumps blood, how our eyes and ears work ect.
if you can't use a controlled experiment you should....
build a model so you can control the factors
controlled experiment
involves a control group, experimental group, and a variable
to study the side effects of a medicine you should...
include a control group that doesn't get medicine
g/cm3
SI unit for density
oil is
less dense than water
steel has a
density that is less than water
millimeters
the measurement used to describe a grain of rice
ice is
less dense than water
milli-
a prefix meanning 1/1,000
37 degrees celcius
the normal body temperature
density...
depends on mass and volulme
inertia
increases as mass increases
volume of a liquid is measured...
at the lowest part of the meniscus
meters cubed
what the volume of a solid is expressed in
gravity
effects an object's weight
newton
the SI unit of force
weight is...
dependent on where the object is in relation to earth, also depends on the mass of the object and the mass of earth
density is the same at
a given pressure and temperature
a favorable chemical property of irn is..
nonreactivity with oil and gasoline
to distinguish between wax and plastic you could
burn them separately
chemical changes
can be undone by other chemical changes
newton
the weight of a large apple
titanium
has low mass per unit volume
kilogram
SI unit for matter
dissolving salt in water demonstates
solubility and a physical change
boiling and freezing points are
examples of physical properties
condensation
a change of state where atoms become more ordered
the volume of gas in a piston decreases when
the temperature doesn't change but the pressure is reduced
the particles of water that evaporate from an pen container have...
more speed and higher energy than the particles that remain
fulgurite
an amorphous solid formed when lightning strikes silica
plasma
a form of matter where the particles are broken apart
if a pressure cooker contains steam at high pressure then..
the particles of gas are close together and collide with the inside of the container at a fast rate
Boyle's Law
states that for a fixed amount of gas at a constant temperature, the volume increases as the pressure increases
Charle's law
states that for a fixed amount of gas at a constant pressure, volume increases as temperature increases
freezing
occurs at same temperature as melting
irn has a
higher freezing point than water
boiling
vaporization that occurs throughout a liquid
atmospheric pressure is...
lower at the top of the mountain, lowering the boiling point of the water
condensation point
the same temperature as the boiling point at a given pressure and the temperature at which gas changes to a liquid
solid carbon dioxide
is most likely to undergo sublimation
steam condenses into liquid water
at 100 degrees celcius at sea level
amorphous solid
has particles that are not in an orderly arrangement
to boil water at a temperature lower than 100 celcius you must....
decrease the pressure
fog forms when
the air temperature drops
vaporization
a change of state used to cool football players down
to increase the solubility of gas in a liquid you should...
decrease the temperature
a substance that can only be separated by chemical means is
water (electrolosis)
metal
an element that conducts thermal energy well and is easily shaped
the particles in both a suspension and a colloid can
scatter light
distillation
a process that can be used to separate crude oil from its components
nonmetals are
unmallable
gold is....
not a compound
nitrogen
an element needed to make proteins in nature
air is a
mixture
brass is not a....
suspension
blood is a...
suspension
a suspension is a
heterogeneous mixture
the elements gold, copper, sulfur, neon, and carbon
do not react readily with water or air and can be found uncombined in nature.
metalloids
can become good conductors when mixed with other elements
a colloid
can be made from solids, liquids, and gases
a suspension can be...
a medicine that instructs you to shake the bottle well before using
steel is a....
mixture, alloy, and solution
examples of metalloids are...
silicon, boron, and antimony
examples of colloids are...
fog, milk, and mayonnaise
gravity
based on mass of objects and distance between them
electron
the least massive particle of an atom
the size of atoms...
varies widely
mass number
the sum of protons and neutrons
atomic number
the number of protons
atomic mass
a weighted average of all the naturally occurring isotopes
ion
has unequal amount of protons and electrons
isotope
has unequal amounts of protons and neutrons
electromagnetic force
holds the electrons around the nucleus, causes protons in the nucleus to push away from each other
halogens
a group of highly reactive gases
alkaline-earth metals
have greater density than alkali metals
silicon
a metalloid
most metals...
are made up of atoms with few electrons in their outer energy level
the elements in groups 3-12
are solids at room temperature, except for mercury
Mosely determined the number of _ in an atom
protons
the elements in a period become...
less metallic from left to right
period
a row of elements on the periodic table
group
a column of elements on the periodic table
lithium
a very reactive metal
nonmetals
have an almost complete set of electrons in their outer energy level
metalloids
have a half-complete set of electrons in their outer energy level
air
mainly composed of elements that are nonmetals
alkali metals
soft enough to be cut with a knife
Hydrogen
has physical properties more like the properties of nonmetals than of metals; the most abundant element in the universe
actinides
are radioactive
lanthanides
part of period 6, metals, shiny and reactive
bromine
the element that's most reactive with potassium
sodium
the element thats most reactive with oxygen