Download - MID-TERM EXAM REVIEW
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MID-TERM EXAM REVIEW
8th Grade ScienceDecember, 2010
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• A model of a molecule or atom
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Anna Grace Collum
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• An experiment is designed to test a……
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• The statement, “gravity is the attractive force between objects,” is a scientific……
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• Physical science includes the study of _______ and______
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• The science concerning the study of energy and how it affects matter is called…
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• The study of matter and energy is called
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• Physics involves studying different forms of
ENERGY
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• In science,______ is an explanation for a phenomenon based on observation and experimental results.
THEROY
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• A scientific_______ is a summary of many experimental results and observations.
LAW when you mix dry ice and liquid soap
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• A stopwatch, a balance, a thermometer, a calculator, and a computer are all tools used to collect and analyze______.
Data
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Exam Study GuideQuestions 16-20
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• A ___________ can be used to predict storms around the world.
• The “big bang” is a type of ____________• By: Jacob• Fountain
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# 16When using scientific methods
in an investigation, scientists ask questions and make
observations.
Click It!!!
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Use the following terms to complete the sentences.Mass, Volume, Temperature, Density• #17. The measure of the size of an object is
Volume• #18. The ratio of mass to volume is an object’s
Density.• #19. the measure of how hot or cold an object is
the Temperature.• #20. the amount of matter in an object is its
MassClick It!!!
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Cindy Marie Harrison
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Because of _____ all objects tend to resist a change in motion.
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• The physical property of matter that describes the relationship between mass and volume is______.
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• Water evaporating from a puddle is an example of a _____.
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• One way to learn about the properties of a ________ substance is to observe what new substances form during a reaction
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• An objects ______ is affected by the gravitational force.
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Justin Neil Keyes
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Question # 26
• A copper penny can turn green if it reacts with carbon dioxide and water. This is an example of a(n) ____.
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Question # 27
• Things with______ cannot share the same place at the same time.
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Question # 28
• A chemical ________ describes which changes are possible for a substance.
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Question # 29
• A chemical ______ describes the process by which new substances are formed.
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Question # 30
• The amount of matter in an object is its __.
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31
• The SI unit for mass is the ________.
• KILOGRAM
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35-39
Emily Malone
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The particles of GAS a are far apart and move
independently of one another.
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A liquid’s resistance to flow is called
Viscosity
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The shape and volume of matter in the Solid
state do not change.
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The drops of water that appear on the outside of a glass of cold juice on
a warm day are an example of CONDENSATION
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The way a balloon decreases in volume when the temperature is
decreased illustrates Charles’s Law
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Magail noyola
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The amount of space an object takes up is its VOLUME
These boxes take up space so they are considered volume
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The particles of a crystalline SOLID have a three dimensional pattern.
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A pure substance made of two or more elements that are chemically combined
is called a…..
COMPOUND
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If a spoonful of salt is mixed in a glass of water , the salt is the……
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A colloid has the properties of solutions and….
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Particles of two or more substances that are distributed evenly among each other form a…
MIXTURE
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Erin Remkus
Questions 60-64
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A Mixture of liquids can be separated by....
DISTILLATION
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Bacteria can make compounds from in the air. nitrogen
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•Poor Conductors of heat
•Poor conductors of electric current
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Elements join in a specific mass ratio to
form a compound!
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PROTONA positively
charged particle in
the nucleus of an atom!
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Questions 65-69
By: James Rivers
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Question #65
An atom of an element that has the same number of protons but a different number of neutrons is called an _________.
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Question #66
The region in an atom that contains most of the mass is the ________.
nucleus
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Question #67
The number of protons in an atom determines its _____________.
atomic number
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Question #68
The weighted average of all the naturally occurring isotopes of an element is called the ____________.
Atomic mass
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Question #69
• The smallest particle into which an element can be divided and still be the same substance is an ________.
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Questions 70-74
By Bryan Romans
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• Thomson discovered the negatively charged particles called ______.
electrons
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• Rutherford believed that each atom has a______ at its center.
nucleus
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• The current atomic theory includes the _______ model.
electron cloud
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• All substances are made of ____.atoms
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Ryan Romans
75-79
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Question # 75• Most elements have a mixture of two or more ______.
• isotopes
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Question # 76• Protons stay together in the
nucleus because of _____ force.
• strong
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Question # 77• Objects are pulled toward one
another by __________ force.
• gravitational
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Question # 78• Electrons around the nucleus are
held in place by ____________ force.
• electromagnetic
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Exam Study Guide
By: Tanner Seal
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In 1891 the British scientist J.J. Thomson discovered________, the negatively charged particles in the
atom
electrons
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Twentieth-century scientists believe electrons are found in regions
called______________.
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Neutrons and ________ each have a mass of about 1 amu.
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The pushes and pulls between objects are called_______.
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Tori Sockwell85-89
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Isotopes have different numbers of .
Atoms that are _______ of each other are always the same element.
A charged particle is called an .
neutrons
isotopes
ion
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The sum of the protons and neutrons in an atom is called the .
Around 440 BCE, Democritus proposed the idea of an _____, a particle that could not be cut in half.
Mass number
atom
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BY: TYA SPEARS
Q:90-94
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By: Cory Svenson-Mills
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• A rule that states that repeating
chemical and physical properties
of elements change periodically
with the atomic number of the element is
the_________________.
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• Iodine and chlorine are examples of ___________.
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• Pure_________ are often stored in oil to keep them from
reacting with the water and oxygen
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• Atoms of____________ have two outer-level
electrons.
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• Each up-and-down column of elements on the periodic table is
called a(n)___________.
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Rikki Leigh Thompson
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• In the Boron Group, the most common element is___________?
Aluminu
m
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Carbohydrates
Question # 100
Proteins, fats, and _____________, which are compounds of carbon, Are necessary for life on Earth.
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Nitrogen and_______ can be combined to make ammonia.
Hydrogen
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Germanium and______ are used to make computer chips.
Silicon
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A substance needs__________ to burn.
Oxygen
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105-109
Lindsey Wallace
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When something is ______, it occurs or repeats at regular intervals
periodic
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Mendeleev’s table became known as the periodic table of the __________.elements
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All of the more than 30 elements discovered since 1914 follow the _______________.Periodic law
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Properties such as conductivity and reactivity change gradually from left to right in each __________period
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A family is also called a _______.group
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• 110- because they are so reactive
_____ metals are found only combined with other elements in nature.
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• 111- the elements in groups 3-12 are known as _____ metals.
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• 112-Sodium and potassium are ____ metals.
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• 113-Some of the ________, the shiny, reactive transition metals, are used to make steel.
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• 114- all the atoms of _____ are unstable.
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By: Sydney Wesson
Questions 115 -119
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Chlorine and Bromine are examples of what?
A: Halogens
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Semi-Conductors also know as_______ have some properties of metals and some properties of nonmetals.
A: Metalloids Boron
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The______ Metals are shiny and have one or two electrons in their outer level
A: Transition
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Magnesium, calcium and barium are ______ metals.
Alkaline-Earth
Magnesium
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120-124
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• What is formed when atoms gain or lose electrons the charged particles are called
IONS
• An interaction that holds two atoms together is called a
CHEMICAL BOND
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• An electron that is in the outermost shell of an atom is a
VALENCE ELETRON
• Neutral atoms covalently bonded together form a
MOLECULE
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• The bond formed by the attraction between positively charged metal ions and the electrons around them is a
• METALLIC BOND
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Jason Bilancione
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Used to balance chemical equations.
Coefficient
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The number that cannot change to balance a chemical equation.
Subscript
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If an energy diagram shows products at a lower energy than the reactants.
Exothermic
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In a double-displacement reactions,___ from two compounds exchange places.
Ions
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Energy released in exothermic reactions was stored in chemical bonds in the _____.
Reactants
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140-144
McKenzie Byrd
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Question 140
• Paper will burn at 451 Fahrenheit. For this chemical reaction to begin, 451 F is the__________?
• Activation energy
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Question 141
• A shorthand notation that represents a compound or diatomic molecule is called an_______?
• Chemical formula
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Question 142
• When________ bump into one another with enough energy, chemical bonds break.
• Molecule
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Question 143
• When chemical bonds break, the atoms rearrange to form new_______
• Substance
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Question 144
• In a chemical formula, if no_______ is written after an element, then the only one atom of the element is present.
• subscript
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145~149Issac
Garrison
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Question 145
• A substance that slows down or stops a chemical reaction is called a Inhibitor.
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Question 146
• The force that holds two atoms together is called a Chemical Bond.
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Question 147
• The minimum amount of energy needed to start a reaction is called a Activation Energy.
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Question 148
• In a Double Replacement reaction, ions in different compounds switch places.
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Question 149
• A molecule made up of two atoms is Diatomic.
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150-153
EduardoCerda
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#150
• How hot or cold something is, usually measured in degrees Celsius or Kelvin's
B. temperature
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#151
• The amount of matter in a given volumeA. density
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#152• The amount of matter in an objectD. mass
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#153
• The amount of space that something occupies
C. volume
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TY DEATON
154-159
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A measure of the amount of matter in object.
Mass
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A measure of the gradational force on objects.
Weight
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• The curve at liquid’s surface
meniscus
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• Anything that has mass and takes up space
mass
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• The amount of space occupied by an object
volume
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• The tendency of matter to resist in changes in motion
inttia
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166-170
Joe Lee
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#166
The type of matter and its arrangement in an object
THE ANSWER IS COMPOSITION
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#167
• The ability of a substance to burn
• Flammability
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#168
• The process of changing into entirely new substances
• Chemical change
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#169
• Changes in matter that do not change the composition of the substance
• Physical change
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#170
• The ability of two or more substances to combine to form other substances
• Reactivity
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Questions 171- 175
By: Amanda Marquart
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The saltiness of seawater is the result of this property
solubility
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Objects float or sink as a result of this property
density
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The breakdown of water to form two gases is the result of
this process
electrolysis
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The type of matter that makes up an object and the way it is arranged
composition
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The physical form in which a substance exists
state of matter
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176-180
T.J. Maxwell
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#176
The ability of a substance to resist burning
Answer- non flammable
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#177
The tendency of a substance to resist changes in motion
Answer- inertia.
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#178
The rate at which a substance conducts heat
Answer- thermal conductivity.
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#179
Aluminum made into thin sheets of foil
Answer- malleability
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#180
An ice cube made of solid water
Answer- state of matter
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181-185
By Whitney Merritt
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• Rust forming on metals is an indication Reactivity • coppers pulled into thin wires is an indication
of Ductility
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• Flavored drink mix dissolving in water shows Solubility • Objects floating or sinking in water showsDensity• Wood burning in a fireplace showsFlammability
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186-190 questions
By Chase Michael
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• 186.A pure substance that cannot be separated into simpler substances by physical or chemical means element.
• 187. A sample of matter, either a single element or a single compound, that has definite chemical and physical properties.
• 188. An element that is shiny and conducts heat and electric current metal.
• 189. Element that conducts heat and electricity poorly and can be a solid, liquid, or gas nonmetal.
• 190. Element that has the properties of both metals and nonmetals metalloid.
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The number of protons in an atom?
Atomic number
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An interaction that hold two atom together ?
Chemical bond
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An electron in the outermost energy level of an atom?
Valence electron
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Elements that have 8 valence electrons and normally do not form
chemical bond ?
Noble gases
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Bond that forms when atoms share one or more pairs of electrons ?
Covalent bond
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Bond that forms when atoms share one or more pairs of electrons?
:Covalent bond
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Number of protons in an atom?
:Atomic Number
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Smallest unit of a substance that keeps all of the properties of that
substance?
:Molecule
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Souring milk is an example of a…
:Chemical Change
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During physical changes, matter always retains its…
:Identity
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What has mass and takes up space?
:Matter
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How does a physical change differ from a
chemical change?
:The composition of the matter is unchanged.
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How could you change the mass of an object?
:Add or take away some matter.
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220-223
Chris Stanley
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• 220.Two or more substance combine to form one new compound.
Synthesis reaction
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• 221.One compound break down to form two or more substance.
Decomposition reaction
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• 222. ions from two compound exchange places.
double-displacment reaction
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• 223. one element replaces another element in a compound
single displacement reaction
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Bond that forms when atoms share one or more pairs of electrons?
:Covalent bond
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Number of protons in an atom?
:Atomic Number
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Smallest unit of a substance that keeps all of the properties of that
substance?
:Molecule
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Souring milk is an example of a…
:Chemical Change
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During physical changes, matter always retains its…
:Identity
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What has mass and takes up space?
:Matter
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How does a physical change differ from a
chemical change?
:The composition of the matter is unchanged.
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How could you change the mass of an object?
:Add or take away some matter.
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Questions…224-228
Denim Smith
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______- needed to break chemical bonds in reactants.
catalyst
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• _____- the smallest amount of energy needed to start a chemical reaction.
inhibitor
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• _____- the speed needed at which new particles form in a chemical reaction.
rate of reaction
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• _____- something that slows a chemical reaction.
activation energy
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• ____- something that speeds up a chemical reaction.
energy
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Questions 229-233
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Which of the following units would you use to express the volume of an irregular
solid such as a rock?
Cubic Centimeter
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What makes characteristic properties useful to science?
They can be used to identify matter.
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How does a physical change differ from a chemical change?
In a physical change the composition is unchanged.
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What chemical property is responsible for iron rusting?
Reactivity with oxygen.
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Which physical properties of matter describes the relationship between
mass and volume?
Density!
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239-243
AustinWallace
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Question #239
• Boiling point, melting point, and density are some of some of an element’s = Physical properties
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Question #240
• A property of an element that does not depend on the amount of the element is called a = Characteristic property
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Question #241
• When two or more elements join together chemically = A compound is formed
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Question #242
• Which of the following will NOT break down compounds = filtering
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Question #243
• How do elements join to form compounds = In a specific mass ratio
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249-253
Coleton young
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Questions (249)
• (249) What particle did J.J. Thomson Discover?
ELECTRON
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Question (250)
• Where are electrons Likely to be found?
• ELECTRON CLOUDS
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Question (251)
• Dalton believed that
• (Atoms)
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Question (252)
• An atom of gold with 79 protons, 79 electrons, and 118 neutrons would have a mass number of.
• 197
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• What did Bohr, Democritus, Thomas, Dalton, and Rutherford all have in common?
• They each developed ideas about atoms
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Interpreting Graphics
BY: Zachary Worley
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Questions & Answers
254. Two substances combine forming a new compound. Synthesis reaction
255. A substance breaks down into new substances. Decomposition reaction
256. Sharp object _D_257. Clothing protection _B_258. Chemical safety _A_259. Eye Protection _C_
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Questions 160-165
by: Alexis Welch
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Ability to be made into thin sheets.
Answer: Malleability
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A change in the form of a substance that does not change its identify.
Answer: Physical
change
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The ability to conduct electric current.
Answer: Electrical
conductivity
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The relationship between mass and volume.
Answer: Density
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Ability of a substance to dissolve.
Answer: Solubility
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Characteristic that can be observed or measured such as color, state, or hardness.
Answer: Physical Property
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Questions 191-195
By: Christina Ogletree
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Questions *50-54*
John Patrick
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• 50. If hydrogen peroxide is exposed to light, a _____ will result.
• 51. The production of steel involves heating carbon, iron, and other elements to very high heats in order to form a ______
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• 52. A nonmetal would probably not be good for the frame of a bicycle because it would be too ______.
• 53. An element that conducts heat and is dull is probably a _____.
• 54. An unidentified substance is shiny and malleable is a ____.
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Samantha Worsham
125-129
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• The number of protons in an atom is its _____.
• Atoms in the same ____ have the same number of valence electrons
• An electron in the outermost level of an atom is a ____.
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• If a sodium atom loses its only valence electron, it becomes a ____.
• For electrons to pull away from atoms, ____ is needed.