MID-TERM EXAM REVIEW

MID-TERM EXAM REVIEW

8th Grade ScienceDecember, 2010

Science QuestionsBy Jon Chapman

• A model of a molecule or atom

Anna Grace Collum

• An experiment is designed to test a……

• The statement, “gravity is the attractive force between objects,” is a scientific……

• Physical science includes the study of _______ and______

• The science concerning the study of energy and how it affects matter is called…

Chelsea Dewberry

11-15

• The study of matter and energy is called

• Physics involves studying different forms of

ENERGY

• In science,______ is an explanation for a phenomenon based on observation and experimental results.

THEROY

• A scientific_______ is a summary of many experimental results and observations.

LAW when you mix dry ice and liquid soap

• A stopwatch, a balance, a thermometer, a calculator, and a computer are all tools used to collect and analyze______.

Data

Exam Study GuideQuestions 16-20

• A ___________ can be used to predict storms around the world.

• The “big bang” is a type of ____________• By: Jacob• Fountain

# 16When using scientific methods

in an investigation, scientists ask questions and make

observations.

Click It!!!

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!!!

Cindy Marie Harrison

Because of _____ all objects tend to resist a change in motion.

• The physical property of matter that describes the relationship between mass and volume is______.

• Water evaporating from a puddle is an example of a _____.

• One way to learn about the properties of a ________ substance is to observe what new substances form during a reaction

• An objects ______ is affected by the gravitational force.

Justin Neil Keyes

Question # 26

• A copper penny can turn green if it reacts with carbon dioxide and water. This is an example of a(n) ____.

Question # 27

• Things with______ cannot share the same place at the same time.

Question # 28

• A chemical ________ describes which changes are possible for a substance.

Question # 29

• A chemical ______ describes the process by which new substances are formed.

Question # 30

• The amount of matter in an object is its __.

31

• The SI unit for mass is the ________.

• KILOGRAM

35-39

Emily Malone

The particles of GAS a are far apart and move

independently of one another.

A liquid’s resistance to flow is called

Viscosity

The shape and volume of matter in the Solid

state do not change.

The drops of water that appear on the outside of a glass of cold juice on

a warm day are an example of CONDENSATION

The way a balloon decreases in volume when the temperature is

decreased illustrates Charles’s Law

Magail noyola

The amount of space an object takes up is its VOLUME

These boxes take up space so they are considered volume

The particles of a crystalline SOLID have a three dimensional pattern.

A pure substance made of two or more elements that are chemically combined

is called a…..

COMPOUND

If a spoonful of salt is mixed in a glass of water , the salt is the……

A colloid has the properties of solutions and….

Particles of two or more substances that are distributed evenly among each other form a…

MIXTURE

Erin Remkus

Questions 60-64

A Mixture of liquids can be separated by....

DISTILLATION

Bacteria can make compounds from in the air. nitrogen

•Poor Conductors of heat

•Poor conductors of electric current

Elements join in a specific mass ratio to

form a compound!

PROTONA positively

charged particle in

the nucleus of an atom!

Questions 65-69

By: James Rivers

Question #65

An atom of an element that has the same number of protons but a different number of neutrons is called an _________.

Question #66

The region in an atom that contains most of the mass is the ________.

nucleus

Question #67

The number of protons in an atom determines its _____________.

atomic number

Question #68

The weighted average of all the naturally occurring isotopes of an element is called the ____________.

Atomic mass

Question #69

• The smallest particle into which an element can be divided and still be the same substance is an ________.

Questions 70-74

By Bryan Romans

• Thomson discovered the negatively charged particles called ______.

electrons

• Rutherford believed that each atom has a______ at its center.

nucleus

• The current atomic theory includes the _______ model.

electron cloud

• All substances are made of ____.atoms

Ryan Romans

75-79

Question # 75• Most elements have a mixture of two or more ______.

• isotopes

Question # 76• Protons stay together in the

nucleus because of _____ force.

• strong

Question # 77• Objects are pulled toward one

another by __________ force.

• gravitational

Question # 78• Electrons around the nucleus are

held in place by ____________ force.

• electromagnetic

Exam Study Guide

By: Tanner Seal

In 1891 the British scientist J.J. Thomson discovered________, the negatively charged particles in the

atom

electrons

Twentieth-century scientists believe electrons are found in regions

called______________.

Neutrons and ________ each have a mass of about 1 amu.

The pushes and pulls between objects are called_______.

Tori Sockwell85-89

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

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

BY: TYA SPEARS

Q:90-94

By: Cory Svenson-Mills

• A rule that states that repeating

chemical and physical properties

of elements change periodically

with the atomic number of the element is

the_________________.

• Iodine and chlorine are examples of ___________.

• Pure_________ are often stored in oil to keep them from

reacting with the water and oxygen

• Atoms of____________ have two outer-level

electrons.

• Each up-and-down column of elements on the periodic table is

called a(n)___________.

Rikki Leigh Thompson

• In the Boron Group, the most common element is___________?

Aluminu

m

Carbohydrates

Question # 100

Proteins, fats, and _____________, which are compounds of carbon, Are necessary for life on Earth.

Nitrogen and_______ can be combined to make ammonia.

Hydrogen

Germanium and______ are used to make computer chips.

Silicon

A substance needs__________ to burn.

Oxygen

105-109

Lindsey Wallace

When something is ______, it occurs or repeats at regular intervals

periodic

Mendeleev’s table became known as the periodic table of the __________.elements

All of the more than 30 elements discovered since 1914 follow the _______________.Periodic law

Properties such as conductivity and reactivity change gradually from left to right in each __________period

A family is also called a _______.group

• 110- because they are so reactive

_____ metals are found only combined with other elements in nature.

• 111- the elements in groups 3-12 are known as _____ metals.

• 112-Sodium and potassium are ____ metals.

• 113-Some of the ________, the shiny, reactive transition metals, are used to make steel.

• 114- all the atoms of _____ are unstable.

By: Sydney Wesson

Questions 115 -119

Chlorine and Bromine are examples of what?

A: Halogens

Semi-Conductors also know as_______ have some properties of metals and some properties of nonmetals.

A: Metalloids Boron

The______ Metals are shiny and have one or two electrons in their outer level

A: Transition

Magnesium, calcium and barium are ______ metals.

Alkaline-Earth

Magnesium

120-124

• 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

• An electron that is in the outermost shell of an atom is a

VALENCE ELETRON

• Neutral atoms covalently bonded together form a

MOLECULE

• The bond formed by the attraction between positively charged metal ions and the electrons around them is a

• METALLIC BOND

Jason Bilancione

Used to balance chemical equations.

Coefficient

The number that cannot change to balance a chemical equation.

Subscript

If an energy diagram shows products at a lower energy than the reactants.

Exothermic

In a double-displacement reactions,___ from two compounds exchange places.

Ions

Energy released in exothermic reactions was stored in chemical bonds in the _____.

Reactants

140-144

McKenzie Byrd

Question 140

• Paper will burn at 451 Fahrenheit. For this chemical reaction to begin, 451 F is the__________?

• Activation energy

Question 141

• A shorthand notation that represents a compound or diatomic molecule is called an_______?

• Chemical formula

Question 142

• When________ bump into one another with enough energy, chemical bonds break.

• Molecule

Question 143

• When chemical bonds break, the atoms rearrange to form new_______

• Substance

Question 144

• In a chemical formula, if no_______ is written after an element, then the only one atom of the element is present.

• subscript

145~149Issac

Garrison

Question 145

• A substance that slows down or stops a chemical reaction is called a Inhibitor.

Question 146

• The force that holds two atoms together is called a Chemical Bond.

Question 147

• The minimum amount of energy needed to start a reaction is called a Activation Energy.

Question 148

• In a Double Replacement reaction, ions in different compounds switch places.

Question 149

• A molecule made up of two atoms is Diatomic.

150-153

EduardoCerda

#150

• How hot or cold something is, usually measured in degrees Celsius or Kelvin's

B. temperature

#151

• The amount of matter in a given volumeA. density

#152• The amount of matter in an objectD. mass

#153

• The amount of space that something occupies

C. volume

TY DEATON

154-159

A measure of the amount of matter in object.

Mass

A measure of the gradational force on objects.

Weight

• The curve at liquid’s surface

meniscus

• Anything that has mass and takes up space

mass

• The amount of space occupied by an object

volume

• The tendency of matter to resist in changes in motion

inttia

166-170

Joe Lee

#166

The type of matter and its arrangement in an object

THE ANSWER IS COMPOSITION

#167

• The ability of a substance to burn

• Flammability

#168

• The process of changing into entirely new substances

• Chemical change

#169

• Changes in matter that do not change the composition of the substance

• Physical change

#170

• The ability of two or more substances to combine to form other substances

• Reactivity

Questions 171- 175

By: Amanda Marquart

The saltiness of seawater is the result of this property

solubility

Objects float or sink as a result of this property

density

The breakdown of water to form two gases is the result of

this process

electrolysis

The type of matter that makes up an object and the way it is arranged

composition

The physical form in which a substance exists

state of matter

176-180

T.J. Maxwell

#176

The ability of a substance to resist burning

Answer- non flammable

#177

The tendency of a substance to resist changes in motion

Answer- inertia.

#178

The rate at which a substance conducts heat

Answer- thermal conductivity.

#179

Aluminum made into thin sheets of foil

Answer- malleability

#180

An ice cube made of solid water

Answer- state of matter

181-185

By Whitney Merritt

• Rust forming on metals is an indication Reactivity • coppers pulled into thin wires is an indication

of Ductility

• Flavored drink mix dissolving in water shows Solubility • Objects floating or sinking in water showsDensity• Wood burning in a fireplace showsFlammability

186-190 questions

By Chase Michael

• 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.

The number of protons in an atom?

Atomic number

An interaction that hold two atom together ?

Chemical bond

An electron in the outermost energy level of an atom?

Valence electron

Elements that have 8 valence electrons and normally do not form

chemical bond ?

Noble gases

Bond that forms when atoms share one or more pairs of electrons ?

Covalent bond

Bond that forms when atoms share one or more pairs of electrons?

:Covalent bond

Number of protons in an atom?

:Atomic Number

Smallest unit of a substance that keeps all of the properties of that

substance?

:Molecule

Souring milk is an example of a…

:Chemical Change

During physical changes, matter always retains its…

:Identity

What has mass and takes up space?

:Matter

How does a physical change differ from a

chemical change?

:The composition of the matter is unchanged.

How could you change the mass of an object?

:Add or take away some matter.

220-223

Chris Stanley

• 220.Two or more substance combine to form one new compound.

Synthesis reaction

• 221.One compound break down to form two or more substance.

Decomposition reaction

• 222. ions from two compound exchange places.

double-displacment reaction

• 223. one element replaces another element in a compound

single displacement reaction

Bond that forms when atoms share one or more pairs of electrons?

:Covalent bond

Number of protons in an atom?

:Atomic Number

Smallest unit of a substance that keeps all of the properties of that

substance?

:Molecule

Souring milk is an example of a…

:Chemical Change

During physical changes, matter always retains its…

:Identity

What has mass and takes up space?

:Matter

How does a physical change differ from a

chemical change?

:The composition of the matter is unchanged.

How could you change the mass of an object?

:Add or take away some matter.

Questions…224-228

Denim Smith

______- needed to break chemical bonds in reactants.

catalyst

• _____- the smallest amount of energy needed to start a chemical reaction.

inhibitor

• _____- the speed needed at which new particles form in a chemical reaction.

rate of reaction

• _____- something that slows a chemical reaction.

activation energy

• ____- something that speeds up a chemical reaction.

energy

Questions 229-233

Which of the following units would you use to express the volume of an irregular

solid such as a rock?

Cubic Centimeter

What makes characteristic properties useful to science?

They can be used to identify matter.

How does a physical change differ from a chemical change?

In a physical change the composition is unchanged.

What chemical property is responsible for iron rusting?

Reactivity with oxygen.

Which physical properties of matter describes the relationship between

mass and volume?

Density!

239-243

AustinWallace

Question #239

• Boiling point, melting point, and density are some of some of an element’s = Physical properties

Question #240

• A property of an element that does not depend on the amount of the element is called a = Characteristic property

Question #241

• When two or more elements join together chemically = A compound is formed

Question #242

• Which of the following will NOT break down compounds = filtering

Question #243

• How do elements join to form compounds = In a specific mass ratio

249-253

Coleton young

Questions (249)

• (249) What particle did J.J. Thomson Discover?

ELECTRON

Question (250)

• Where are electrons Likely to be found?

• ELECTRON CLOUDS

Question (251)

• Dalton believed that

• (Atoms)

Question (252)

• An atom of gold with 79 protons, 79 electrons, and 118 neutrons would have a mass number of.

• 197

• What did Bohr, Democritus, Thomas, Dalton, and Rutherford all have in common?

• They each developed ideas about atoms

Interpreting Graphics

BY: Zachary Worley

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_

Questions 160-165

by: Alexis Welch

Ability to be made into thin sheets.

Answer: Malleability

A change in the form of a substance that does not change its identify.

Answer: Physical

change

The ability to conduct electric current.

Answer: Electrical

conductivity

The relationship between mass and volume.

Answer: Density

Ability of a substance to dissolve.

Answer: Solubility

Characteristic that can be observed or measured such as color, state, or hardness.

Answer: Physical Property

Questions 191-195

By: Christina Ogletree

Questions *50-54*

John Patrick

• 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 ______

• 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 ____.

Samantha Worsham

125-129

• 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 ____.

• If a sodium atom loses its only valence electron, it becomes a ____.

• For electrons to pull away from atoms, ____ is needed.