Disanza **8th Grade Science Final Review** Updated

Question 1

An organism that makes its own food is called a _______________.

Accepted Answer

producer

Question 2

Chocolate melting

Accepted Answer

Physical Change

Question 3

Baking soda and vinegar creates bubbles

Accepted Answer

Chemical Change

Question 4

What do all waves carry from place to place? Example: heat waves, ultraviolet, light waves.

Accepted Answer

Energy but not matter

Question 5

an organism that gets its energy from other organisms is called _______________.

Accepted Answer

consumer

Question 6

A parachute opens, increasing surface area, allowing contact with more air molecules increasing

Accepted Answer

air resistance

Question 7

Why does a red shirt appear red?

Accepted Answer

All wavelengths are being absorbed except red.

Question 8

A sodium atom forms a (1+) sodium ion by

Accepted Answer

losing 1 electron

Question 9

An interaction when one organism captures and eats another organism is called ___________.

Accepted Answer

predation

Question 10

A pure substance is any substance that contains

Accepted Answer

both A & B

Question 11

Which of the following sub-atomic particle has a negative charge?

Accepted Answer

electron

Question 12

Heating water to 100°C creates bubbles

Accepted Answer

Physical Change

Question 13

Elements on the periodic table are arranged by

Accepted Answer

atomic number

Question 14

What is true of solvents and solutes when they are mixed to create a solution?

Accepted Answer

Solutes dissolve in solvents

Question 15

How are atoms and elements related?

Accepted Answer

Every element has one kind of atom

Question 16

Iron rusting

Accepted Answer

Chemical Change

Question 17

What can you infer about a wave with a short wavelength?

Accepted Answer

high frequency

Question 18

Which of the following sub-atomic particle has no charge?

Accepted Answer

neutron

Question 19

Endothermic reactions __ energy and __ temperature.

Accepted Answer

absorb; decrease

Question 20

Which of the following is not matter?

Accepted Answer

A flash of light

Question 21

Define an atom

Accepted Answer

Basic unit of matter

Question 22

When you measure the temperature of an object you are measuring the amount of _______________.

Accepted Answer

Kinetic energy

Question 23

In the equation H2 + O2 --> 2H2O, the number 2 before H2O is a

Accepted Answer

coeffcient

Question 24

What happens when a chemical bond is broken?

Accepted Answer

Energy is released from broken bonds

Question 25

The Law of Conservation of Mass stated this about chemical reactions/equations __

Accepted Answer

Products equal reactants

Question 26

What happens to electrons when atoms bond?

Accepted Answer

Shared or transferred

Question 27

Chemical energy, stored energy, electrical energy are all types of

Accepted Answer

potential energy

Question 28

Which of the following is the positively charged sub-atomic particle?

Accepted Answer

proton

Question 29

Without a seat belt, you fly forwards with same motion the car was moving in because of __.

Accepted Answer

inertia

Question 30

Dust particles appear to be dancing as they reflect and absorb light. This is an example of

Accepted Answer

scattering

Question 31

The Law of Conservation of Energy stated this about Kinetic & Potential energy __

Accepted Answer

Energy is not gained or lost when it changes

Question 32

An element is a VERY reactive metal, with one valence e-. Where would that it be found?

Accepted Answer

Group 1: Alkali Metals

Question 33

A symbiotic relationship where both organisms benefit is called ____________.

Accepted Answer

mutualism

Question 34

In the ocean, you float because the water is pushing up on your body. This is an example of

Accepted Answer

Buoyant force

Question 35

Which of the following is not a property of a metal?

Accepted Answer

Gas at room temp

Question 36

A force that resists an object in motion, slows it down.

Accepted Answer

friction

Question 37

In the equation H2 + O2 --> 2H2O, the product is

Accepted Answer

2H2O

Question 38

When you move an object from the floor to the table, you increase the __

Accepted Answer

Potential Energy

Question 39

Thermal energy, sound energy, mechanical energy are all types of

Accepted Answer

kinetic energy

Question 40

Carbon-16 has 2 more neutrons than Carbon-14. They are

Accepted Answer

isotopes

Question 41

What does it mean the forces are balanced?

Accepted Answer

Same as no effect at all

Question 42

In a solution, there is always more (what it is being mixed INTO)

Accepted Answer

solvent

Question 43

A group of individuals in the same species in the same areas is called __________.

Accepted Answer

population

Question 44

Exothermic reactions __ energy and __ temperature.

Accepted Answer

release; increase

Question 45

Which of these is CHEMICAL change that can happen to iron?

Accepted Answer

Iron turning red with rust

Question 46

What is density?

Accepted Answer

The amount of mass in a certain volume

Question 47

Elements in the same ___________ have similar properties/characteristics.

Accepted Answer

group

Question 48

A box measures 20 cm in length, 10 cm in width, and 2 cm in height. What is it's volume?

Accepted Answer

400cm3

Question 49

What is the smallest amount of salt (NaCl) you can have?

Accepted Answer

one salt molecule

Question 50

__________ includes all of the living organisms in a specific area interacting together.

Accepted Answer

ecosystem

Question 51

Which compound has a 1:2 ratio of atoms?

Accepted Answer

CO2

Question 52

Look at the picture, what is happening to the light to make this image appear this way?

Accepted Answer

Refraction

Question 53

What is needed to start or change motion?

Accepted Answer

Force

Question 54

Sunlight, air, rocks, ect. are all examples of _____________.

Accepted Answer

abiotic factors

Question 55

In which state of matter do atoms move?

Accepted Answer

all of them

Disanza 8th Grade Science Final Review Updated

Questions 55

Disanza 8th Grade Science Final Review Updated

Questions 55