Quiz about 8th grade science review

Question 1

What is a example of lab safety?

Accepted Answer

Keep your goggles on at all times

Answer

Keep your hair down

Answer

Eat a snack before an experiment

Answer

Play around the equipment

Question 2

What is Natural Selection?

Accepted Answer

The process were organisms better adapted to their environment tend to survive and produce more offspring.

Answer

The process were only plants better adapted to their environment tend to survive and produce more offspring.

Answer

The process were only humans better adapted to their environment tend to survive and produce more offspring.

Answer

The process were individuals better adapted to their environment tend to survive and produce more offspring.

Question 3

A scientific theory...

Accepted Answer

is based on lots of evidence

Answer

is not valid

Answer

is not reliable

Answer

has not been tested many times

Question 4

A scientific ____________ is a statement that describes what always happens under certain conditions in nature.

Accepted Answer

law

Answer

theory

Answer

method

Answer

variable

Question 5

The independent variable is the ONE thing you _____.

Accepted Answer

change

Answer

keep the same

Answer

experiment with

Answer

investigate

Question 6

Walker is testing which fertilizer will grow the tallest grass.  The height of the grown grass is the __ variable.

Accepted Answer

dependent (measured)

Answer

constant (same)

Answer

independent (changes)

Question 7

A _____________________ is something that scientists use to represent an object or process

Accepted Answer

model

Answer

mass

Answer

matter

Answer

weight

Question 8

What is the definition of CONVECTION

Accepted Answer

a  hot liquid or air that  expands, becomes less dense, and rises or becomes more dense, and sinks.

Answer

When heat transfers through waves.

Answer

When heat transfers from objects that are touching.

Answer

Heat traveling from the sun

Question 9

Which of the following is an example of convection?

Accepted Answer

When you are making soup and the water is rising and lowering.

Answer

A hair dryer is drying up your hair.

Answer

When the AC or heater changes the temperature.

Answer

When a car engine turns hot after being turned on.

Question 10

The chart that arranges elements by atomic number is:

Accepted Answer

Periodic Table

Answer

Atomic Number

Answer

Metal

Answer

Chart

Question 11

The smallest unit of an element that still has the properties of that element is:

Accepted Answer

Atom

Answer

Proton

Answer

Nonmetal

Answer

Atomic number

Question 12

A substance that is generally shiny, can be bent, and often conducts heat and electricity is:

Accepted Answer

Metal

Answer

Gas

Answer

Nonmetal

Answer

Element

Question 13

A POSITIVE subatomic particle:

Accepted Answer

Proton

Answer

Neutron

Answer

Electron

Answer

Atom

Question 14

A NEGATIVE subatomic particle is:

Accepted Answer

Electron

Answer

Neutron

Answer

Proton

Answer

Metal

Question 15

How are compounds and elements different?

Accepted Answer

Elements have one kind of atom; compounds have different kinds of atoms

Answer

Elements are metals; compounds are nonmetals

Answer

Elements are pure substances; compounds are not

Answer

Elements exist as solids, liquids, and gases; compounds are solids

Question 16

Are there any compounds on the periodic table

Accepted Answer

no because only elements are on the periodic table

Answer

yes there are many

Answer

I think they are?

Question 17

A substance made up of two or more elements that have been chemically combined

Accepted Answer

compound

Answer

mixture

Answer

substance

Answer

ion

Question 18

Is hammering wood together to build a house a chemical or physical change?

Accepted Answer

physical

Answer

chemical

Question 19

Is melting butter for popcorn a chemical or physical change?

Accepted Answer

physical

Answer

chemical

Question 20

Is bleaching your hair a physical or chemical change?

Accepted Answer

chemical

Answer

physical

Question 21

A substance with a mass of 10 g is heated to produce two new substances. The mass of the first new substance is 9.3 g and the mass of the second new substance is 0.7 g. Which of the following is best demonstrated by this example?

Accepted Answer

law of conservation of mass

Answer

heat transfer

Answer

physical change

Answer

law of conservation of energy

Question 22

The diagrams below represent different ways heat is transferred. The arrows in the diagrams show the direction of heat transfer.

Which table shows the primary way heat is transferred in each diagram?

Accepted Answer

Option C is correct

Answer

A.

Answer

B.

Answer

D.

Question 23

Why is it harder for the boy in Image B to get down the hill?

Accepted Answer

Friction

Answer

Motion

Answer

Work

Answer

Displacement

Question 24

If these boys are pulling with the same amount of force.  What will happen?

Accepted Answer

They will not move at all.

Answer

The boy in blue will win.

Answer

The boy in red will win.

Answer

Both will fall down.

Question 25

Which of the following statements is true?

Accepted Answer

Unbalanced forces cause a change in motion.

Answer

Balanced forces cause a change in motion.

Answer

Forces do not effect the change in motion.

Question 26

Gravitational potential energy depends on the ________ and ________ of the object.

Accepted Answer

Height and mass

Answer

Friction and movement

Answer

Mass and Movement

Answer

Height and Friction

Question 27

When alleles are different (ex: Yy)

Accepted Answer

heterozygous

Answer

dominant

Answer

homozygous

Question 28

When alleles are the same (ex: YY or yy)

Accepted Answer

homozygous

Answer

heterozygous

Answer

recessive

Question 29

the physical look of a trait (what do you see?)

Accepted Answer

phenotype

Answer

genotype

Answer

allele

Question 30

the genetic code for the gene (YY, Yy, yy)

Accepted Answer

genotype

Answer

phenotype

Answer

allele

Question 31

A grizzly bear survives because he is well-adapted to his environment. When he reproduces he passes those desirable traits to his offspring. This process is called...

Accepted Answer

Natural Selection

Answer

Selective Breeding

Answer

Random mutations

Answer

Variations in a species

Question 32

If Easter eggs were living species of organisms, their different colors would be considered:

Accepted Answer

Variations

Answer

Adaptations

Answer

Different species

Answer

Extinct species

Question 33

The peppered moth's color camouflaged it on the light colored tree bark. It's color was an example of a/n

Accepted Answer

Adaptation

Answer

Variation

Answer

Dominant trait

Answer

Recessive trait

Question 34

Why does sexual reproduction result in more genetic diversity than asexual reproduction?

Accepted Answer

Traits from two parents are combined.

Answer

More organisms reproduce this way.

Answer

Offspring grow in different environments.

Answer

Offspring come from identical parents.

Question 35

Organisms that reproduce asexually generally have offspring that are

Accepted Answer

genetically identical.

Answer

unicellular.

Answer

multicellular.

Answer

genetically varied.

Question 36

Used to measure length and distance in the metric system

Accepted Answer

Meter stick

Answer

Graduated cylinder

Answer

Triple beam balance

Answer

Thermometer

Question 37

Mutations in genes cause

Accepted Answer

variation

Answer

competition

Answer

reproduction

Answer

strength

Question 38

Flammability is an example of what property?

Accepted Answer

Chemical property

Answer

Physical property

Question 39

Control (constant)

Accepted Answer

What remains the same

Answer

What I change

Answer

What I observe and measure

Question 40

An idea or explanation that you then test through study and experimentation

Accepted Answer

hypothesis

Answer

theory

Answer

scientific law

Question 41

Select all of the following that scientific knowledge is based on.

Accepted Answer

empirical evidence

Accepted Answer

logical reasoning

Accepted Answer

predictions and models

Answer

beliefs

Answer

opinions

Question 42

Law of Conservation of Mass says that matter CAN be created and CAN be destroyed.

Accepted Answer

False

Answer

True

Question 43

When humans breed plants or animals with desired traits

Accepted Answer

Selective Breeding

Answer

Natural Breeding

Answer

Artificial Selection

Answer

Competition

Question 44

English naturalist-studied plants & animals-set forth the Theory of Evolution

Accepted Answer

Charles Darwin

Answer

Charles Brown

Answer

Galapagos Island

Answer

Devin Darwin

Question 45

A segment of DNA that determines or helps to determine a trait

Accepted Answer

Gene

Answer

Mutation

Answer

Trait

Answer

DNA

Question 46

What are the 8 levels of classification of living things from most general to most specific?

Accepted Answer

domain, kingdom, phylum, class, order, family, genus, species

Answer

domain, kingdom, phylum, class, order, family, genius, species

Answer

domain, kingdom, phamily, class, order, family, genus, species

Answer

domain, king, phillip, class, order, family, genus, species

Question 47

The scientific name for water bear is Hypsibius dujardini.  What is its genus?

Accepted Answer

Hypsibius

Answer

dujardini

Answer

water

Answer

tardigrade

Question 48

The scientific name for water bear is Hypsibius dujardini.  What is its species?

Accepted Answer

dujardini

Answer

Hypsibius

Answer

water

Answer

tardigrade

Question 49

What is the science of organizing, classifying and naming living things.

Accepted Answer

taxonomy

Answer

taxadermy

Answer

taxicab

Answer

toxicology

Question 50

Which domain includes all animals and plants?

Accepted Answer

Eukarya

Answer

Archaea

Answer

Bacteria

Question 51

Almost all bacteria are...

Accepted Answer

Unicellular

Answer

Multicellular

Question 52

Which two kingdoms are entirely multicellular?

Accepted Answer

Animalia and Plantae

Answer

Animalia and Protista

Answer

Protista and Plantae

Question 53

Organisms whose cells have NO nucleus are classified as...

Accepted Answer

Prokaryotic

Answer

Eukaryotic

Answer

Dead

Question 54

True or False: All cells have DNA.

Accepted Answer

True

Answer

False

Question 55

True or False: All living things are made of one or more cells.

Accepted Answer

True

Answer

False

Question 56

When using a dichotomous key to identify organisms, what do we look at?

Accepted Answer

physical features

Answer

weather patterns

Answer

environment

Answer

diet

Question 57

Using this dichotomous key, identity the name of the circled fish.

Accepted Answer

spotted goat fish

Answer

band-tail puffer

Answer

peacock flounder

Answer

trumpet fish

Question 58

Term given to describe the 2 name naming system is:

Accepted Answer

binomial nomenclature

Answer

dichotmous key

Answer

2 scientific names

Answer

binomial key

Question 59

The first part of a scientific name is an organism's _______________ and the second part is its ________________.

Accepted Answer

genus, species

Answer

species, genus

Answer

phylum, order

Answer

class, spices

Question 60

What happens to water molecules when a large quantity of thermal energy is added to water in the liquid state?

Accepted Answer

The molecules gain kinetic energy, move farther apart, and become a gas.

Answer

The more thermal energy added, the greater the attraction between molecules.

Answer

The water molecules become packed closer together, and their temperature increases.

Answer

Each water molecule gives up kinetic energy and eventually stops moving.

Question 61

Two chemicals are combined in a beaker and react. What data would provide the best evidence for determining if the reaction absorbed or released thermal energy?

Accepted Answer

The temperature inside the beaker before and after the reaction

Answer

The masses of the substances before and after the reaction

Answer

Whether or not light and sound were produced during the reaction

Answer

How long it took for the reaction to take place once the chemicals combined

Question 62

Choose the words or phrases that accurately describes the effects of thermal energy on a system.

Adding thermal energy to the ice _________________________________ the molecules in the ice.

Accepted Answer

speeds up

Answer

slows down

Question 63

What is the mass of a neutron?

Accepted Answer

1 amu

Answer

0 amu

Answer

same as electron

Answer

doesn't have any mass

Question 64

What is the formula to solve for the neutron?

Accepted Answer

Mass - Atomic Number = Neutrons

Answer

Mass + Atomic Number= Neutrons

Answer

Mass x Atomic Number = Neutrons

Answer

Mass + Number of Protons = Neutron

8th grade science review

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