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Grade 8 Science 1st Semester Exam Review Flashcards | StudBud
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Grade 8 Science 1st Semester Exam Review
Grade 8 Science 1st Semester Exam Review
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Answers
1
Color and shape describe the __________ of matter.
appearance
chemical properties
feel
chemistry
2
What is independent variable?
The variable that changes because of what you changed
The variable that changes on its own
The variable you change on purpose
The variable that stays the same
3
Step 1 of the Engineering Design Process is?
Identify need
Build prototype
Brainstorm solutions
Test prototype
4
Where is the greatest source of biodiversity on Earth?
ocean
desert
rainforest
tundra
5
A _____ is used to organize and summarize data in a visual way.
photograph
table
drawing
graph
6
Which of these is a tool used to identify organisms?
a dichotomous key
a hypothesis
a stimulus
a control
7
Report findings is what step of the scientific method?
5
7
3
2
8
What is the fifth step of the scientific method?
Report findings
Make a hypothisis
Gather data
Evaluate data and draw conclusions
9
Which of these is true of scientific methods?
Data can be analyzed in only one way.
It is not important to form a hypothesis.
Conclusions are drawn at the beginning of theprocess.
The problem must be stated at the beginning ofthe process.
10
How many variables should you test at one time in a experiment?
2
As many as needed to get the information
3
1
11
An object's ________ depends only on the amount of matter in the object.
mass
volume
weight
force
12
Which category is the largest in the organism classification system?
domain
genus
species
kingdom
13
Which is an example of bioengineering in farming?
using herbicides to kill weeds
using manipulated DNA to make stronger plants
using pesticides to kill bugs
using certain bugs to eat other bugs on plants
14
Mass and volume depend on the __________ of matter present.
flammability
amount
chemical properties
physical properties
15
Relative dating allows scientists to find the age of a fossil by __________.
unfreezing part of the fossil
comparing ages of the surrounding rock layers
using radioactive elements in the fossil
dating the resin around the sample
16
Change in inherited characteristics over time is called __________.
fossils
species
evolution
camouflage
17
Which property allows a pin to float on the surface of water?
specific heat
surface tension
viscosity
density
18
What is bias in science?
When you have an opinion
When you ignore bad data
When you ignore data that doesn't support your hypothesis
When you create bad data during an experiment
19
Why would a company test a prototype for a new car?
To see if people will buy it
To see if it will work
To see if it improves on the previous model
To see if it looks good
20
Would roads be a intended benefit of cars?
No
Yes
21
What happens when biodiversity is lost in an area?
nothing
individuals adapt
life goes on
species may go extinct
22
What may a series of helpful variations in a species result in?
adaptation
fossils
climatic change
embryology
23
Which unit would be most appropriate to measure the length of a person's finger?
meters
centimeters
nanometers
kilometers
24
What would
not
be needed to test the effect of rain on the growth of the grass?
magnifying glass
ruler
weather report
a lawn with grass
25
Which of the following units do we use to measure the distance between two cities?
centimeter
millimeter
meter
kilometer
26
An example of a physical property is __________.
acidic
color
ability to rust
flammability
27
An example of a chemical change is __________.
water boiling
a car rusting
a window shattering
candle wax melting
28
A ______ displays information in rows and columns.
drawing
photograph
table
graph
29
What is the first step in the scientific method?
Ask a question
Test hypothesis
Form a hypothesis
Make observations
30
What do we do when a hypothesis is not supported by the data in an experiment?
revise the hypothesis
repeat the experiment many times
reanalyze the data
state the problem
31
Step 2 of the Engineering Design Process is...
Research
Brainstorm solutions
Make a prototype
Refine prototype
32
What would happen to a cactus if it were placed in a rainforest?
it would die because it would not get enough sunlight
it would die because it would get too hot
it would die because animals would eat it
it would die because it would not get enough water
33
Which of the following describes the particles in a liquid?
changeable shape and volume
fixed shape and volume
fixed volume, changeable shape
fixed shape, changeable volume
34
When you observe a chemical property, the substance __________.
changes
burns
melts
remains the same
35
Which steps can be repeated in the Engineering Design Process many times?
Test and refine a prototype
Brainstorm and select an option
Make and test a prototype
Identify a need and research
36
Ice melting is an example of a change of __________.
state
chemical property
vapor
physical property
37
An example of a chemical property is __________.
color
density
ability to burn
mass
38
When you observe a physical property, the substance __________.
melts
does not change
changes
burns
39
What tool should be used to measure water volume?
graduated cylinder
test tube
beaker
ruler
40
When a piece of paper is crumbled, this is a change of __________.
state
mass
shape
density
41
The amount of space an object occupies is its________.
weight
mass
length
volume
42
When sandpaper smooths a piece of wood, this is an example of a__________.
physical change
change of state
chemical change
change of matter
43
What is the mass of an object that has a density of 0.44 g/cm
3
and a volume of 25 cm
3
?
28 g
18 g
57 g
11 g
44
A banana browning in the air is an example of __________.
a physical change
a chemical change
a change of state
energy being released
45
An odor being given off can indicate a __________.
chemical change
change of state
physical change
change of density
46
What is not a possible sign of a chemical change?
light given off
a change of state
heat given off
color change
47
Which process allows clouds to form from water vapor in the air?
evaporation
sublimation
melting
condensation
48
Something in an experiment that can change is called a
hypothesis.
prediction.
control.
variable.
49
True or False? In the Engineering Design Process, the steps often times repeat.
FALSUE
TRUE
50
White mice live in a forest with a population of hawks. Which of these statements is true?
The population of white mice will most likelyincrease.
The population of hawks will most likely decrease.
The population of white mice will most likely staythe same.
The population of white mice will most likelydecrease.
51
________ is a measurement of force.
temperature
volume
weight
mass
52
During an experiment, a student found that plants don't need light. What may have happened?
Bias in data interpretation
Wrong hypothesis
Error in experimental procedurre
Wrong experiment
53
What is the process called when a solid changes directly to a gas?
boiling
sublimation
melting
condensation
54
Which is an example of integrated pest management?
using bioengineering to make stronger plants
using herbicides to kill weeds
using special bugs to eat other bugs on plants
using pesticides to kill bugs
55
Would hearing loss be an unintended consequence of headphones?
No
Yes
56
A ________ is made up of all the individuals of a group of related orders of plant or animal.
family
phylum
kingdom
class
57
Color is a __________.
physical property
state of a substance
chemical property
chemical change
58
What does density measure?
weight per unit matter
volume per unit mass
mass per unit volume
matter per unit weight
59
A chemical change __________.
never will change state
cannot be reversed easily
always can be reversed
never can be reversed
60
__________ do (does) not change based on how much matter is present.
Weight
Volume
Mass
Melting point and boiling point
