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
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
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
SI unit for density
less dense than water
steel has a
density that is less than water
the measurement used to describe a grain of rice
less dense than water
a prefix meanning 1/1,000
37 degrees celcius
the normal body temperature
depends on mass and volulme
increases as mass increases
volume of a liquid is measured...
at the lowest part of the meniscus
what the volume of a solid is expressed in
effects an object's weight
the SI unit of force
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
can be undone by other chemical changes
the weight of a large apple
has low mass per unit volume
SI unit for matter
dissolving salt in water demonstates
solubility and a physical change
boiling and freezing points are
examples of physical properties
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
an amorphous solid formed when lightning strikes silica
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
states that for a fixed amount of gas at a constant temperature, the volume increases as the pressure increases
states that for a fixed amount of gas at a constant pressure, volume increases as temperature increases
occurs at same temperature as melting
irn has a
higher freezing point than water
vaporization that occurs throughout a liquid
atmospheric pressure is...
lower at the top of the mountain, lowering the boiling point of the water
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
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
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
an element that conducts thermal energy well and is easily shaped
the particles in both a suspension and a colloid can
a process that can be used to separate crude oil from its components
not a compound
an element needed to make proteins in nature
brass is not a....
a suspension is a
the elements gold, copper, sulfur, neon, and carbon
do not react readily with water or air and can be found uncombined in nature.
can become good conductors when mixed with other elements
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
based on mass of objects and distance between them
the least massive particle of an atom
the size of atoms...
the sum of protons and neutrons
the number of protons
a weighted average of all the naturally occurring isotopes
has unequal amount of protons and electrons
has unequal amounts of protons and neutrons
holds the electrons around the nucleus, causes protons in the nucleus to push away from each other
a group of highly reactive gases
have greater density than alkali 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
the elements in a period become...
less metallic from left to right
a row of elements on the periodic table
a column of elements on the periodic table
a very reactive metal
have an almost complete set of electrons in their outer energy level
have a half-complete set of electrons in their outer energy level
mainly composed of elements that are nonmetals
soft enough to be cut with a knife
has physical properties more like the properties of nonmetals than of metals; the most abundant element in the universe
part of period 6, metals, shiny and reactive
the element that's most reactive with potassium
the element thats most reactive with oxygen
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