Science Final 8th Grade Physical Science
How many calories are in 1 Kilocalorie?
1,000
Which has the most gravitational energy? A skier at 100 feet or 1000 feet.
1000 feet
What is the atomic number of a Carbon atom that has 6 protons
6
Rate of change in velocity is known as...
Acceleration
On the pH scale, what is a 1?
Acid
What are the basic Building blocks of almost all the matter around you?
Atoms
Symbol for carbon
C
A spoon on a stove is an example of what type of heat transfer?
Conduction
A pot of boiling water is an example of what type of heat transfer?
Convection
_______________ reactions require energy to keep going
Endothermic
What do waves transfer?
Energy
_____________ reactions give off energy
Exothermic
__________ is a force that opposes the motion of an object.
Friction
What has the highest wavelength, gamma or radio waves?
Gamma
What is the chemical symbol for water
H20
The tendency of object to resist a change in motion is called what?
Inertia
What is the unit used to measure work called?
Joule
What states that matter cannot be created nor destroyed?
Law of Conservation of Matter
______ are made of carbon, hydrogen, and oxygen
Liquids
_____________ are substances that are both metals and nonmetals
Metalloids
On the pH scale , what is 7 said to be?
Neutral
unit of force
Newton (N)
The general form for a chemical equation is reactant + reactant --> ___________ + Product
Product
What is the process by which heat energy gets to Earth by the Sun?
Radiation
___________ is the bouncing of waves off a surface.
Reflection
A pencil in a clear cup of water is an example of reflection or refraction?
Refraction
______________ is the bending of light rays as they pass through a lens.
Refraction
___________ is the measure of the average kinetic energy of the particles in a substance.
Temperature
The formula for Density is Mass/______
Volume
An ________ is a compound that tastes sour, reacts with metals and turns blue litmus red
acid
An ________ is a mixture of two or more elements
alloy
The __________ ____________ is the number of protons in the nucleus
atomic number
A _____ is a compound that tastes bitter, feels slippery and turns litmus blue
base
On the pH scale, what is a 14?
base
A ________ is a material that increases the speed of a reaction by lowering activation energy
catalyst
Plants convert light energy into ___________ energy.
chemical
a _______ change is when one substance is changed into another
chemical
_______ _______ are made up of two or more simple machines
compound machines
__________ are the pure substances made of two or more different elements
compounds
_______ is material through which electric charges can easily flow
conductor
A __________ bond is a chemical bond that forms when 2 atoms share electrons
covalent
The top of a wave is called the ______.
crest
Solar panels change radiant energy to __________ energy.
electrical
An ________ is a substance that cannot be broken down into simpler substances
element
Frying an egg is an example of an _____________ reaction.
endothermic
ability to do work
energy
an __________ __________ is the specific amount of energy an electron has
energy level
A log on fire is an example of an ___________ reaction.
exothermic
A push or pull is an example of what?
force
Which state of matter are molecules able to move freely?
gas
_______ is a force that attracts objects toward each other
gravity
the vertical column in the periodic table is a ________
group
A __________ ion (OH-) is a negative ion made of oxygen and hydrogen.
hydroxide
An _____ is a material used to slow down a reaction
inhibitor
Atom with the same # of protons and different # if neutrons of the same element is an
isotope
Electricity is an example of _________ energy.
kinetic
Something falling is an example of ______ energy.
kinetic
A roller coaster in motion is an ex. of
kinetic energy
_______ simple machine made up of a bar that pivots at a fixed point called a fulcrum
lever
A metal that is easily hammered is said to be what?
malleable
Potential energy = _______ x height (mh)
mass
_______is the amount of matter in an object
mass
the ________ _________ of an atom is the sum of protons and neutrons in the nucleus
mass number
A car burning fuels changes chemical energy into __________ energy.
mechanical
______ is change in an object position over time
motion
Electrons have a what charge?
negative -
A ________ is a particle in the nucleus that is electrically neutral
neutron
A covalent bond in which the electrons are shared equally is said to be a ________ bond
nonpolar
An _____ ______ has only one path for the current to take
open circuit
Each horizontal row in the periodic table is called
period
Color, hardness, magnetism, and state are ________ properties
physical
forth stae of matter is called
plasma
a _________ bond is a covalent bond in which electrons are shared
polar
Protons have a _______ charge.
positive +
A ride at the top of a roller coaster is an example of __________ energy.
potential
Carrying a bowling ball up a ladder is an example of ________ energy.
potential
The formula for mechanical energy is ______ energy + kinetic energy.
potential
The greater the rise the greater the _______ energy.
potential
A __________ are the new substances you begin with.
product
what is 2,000 times bigger than the other, proton or electron?
proton
the atomic number of a substance is the number of ___________
protons
what type of simple machine is used to pull a flag up a pole?
pulley
The transfer of heat without matter is called __________.
radiation
A _______ is the substances you begin with.
reactant
We have a blue sky because the wavelength is ________ the most.
refracted
Placing the north end of two magnets together ______ each other
repels
The smaller part of a solution is called what?
solute
the largest part of the solution is called......
solvent
______ is measure of the distance traveled per unit of time
speed
Phase change from solid directly to gas is called
sublimation
the max speed an object reaches as it falls is known as _______ _______
terminal velocity
log burning converts chemical energy into _____ _____
thermal energy
a _______ bond forms when 2 atoms share 3 pairs of electrons
triple
The lowest part of a wave is called _________.
trough
___________ electrons are the electrons the outermost energy level of an atom
valence
the process in which a liquid changes to a gas is called.....
vaporization
Speed in a particular direction is called what?
velocity
_______ measures the force of gravity
weight
