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District CA #2 Review-8th Grade Science Flashcards | StudBud
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District CA #2 Review-8th Grade Science
District CA #2 Review-8th Grade Science
40 terms
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Review of 8th grade Chemistry and Physics concepts
Flashcards
40 cards
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Practice quiz
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Host live
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Questions
40
Answers
1
How long would it take to travel 440 km at 44 km/hr
44 hours
10 hours
100 hours
10 km/hr
2
The best definition of Newton's first law is...
an object's motion depends on its acceleration
an object's motion depends on it's mass
an object will remain in motion even if there is friction
an object's motion is dependent on unbalanced forces
3
What does this graphic represent?
Mixture of Atoms
Solid
Element
Compound
4
Which of the following graphs does not show uniform motion?
#4
#3
#1
#2
5
Is this chemical equation balanced or unbalanced ?
unbalanced
balanced
6
What does this graphic represent?
Mixture of Molecules
Compound Molecules
Atoms
7
Under which of the following conditions would the change in an objects speed be greatest?
large net force applied to a heavy object
a large net force applied to a light object
a small net force applied to a light object
small net force applied to a heavy object
8
Electrons on the outermost shell are called:
elements
electron cloud
valence electrons
outer electrons
9
What does the graphic represent?
Mixture
Element
Oxygen
Compound
10
Atoms of different elements ALWAYS have different number of protons.
True
False
11
The motion graph shows...
Constant speed
Deceleration
Stationary object
Acceleration
12
How many atoms are below?
10
4
2
8
13
The motion graph shows...
Constant motion
Stationary object
Acceleration
Deceleration
14
How many molecules are below?
3
2
9
6
15
In neutral atoms, the # of protons = the # of ______________.
neutrons
atoms
elements
electrons
16
A car travels an average speed of 70 km/hr. How far does it travel in 3 hours?
21 km
210 hours
210 km
21 hours
17
How many elements are below?
12
3
6
24
18
What is the atomic number of this model?
4
6
2
19
Which best summarizes the difference between speed and velocity?
speed is how fast it is moving, velocity is not speed
speed is how fast it moves, velocity is speed & direction
speed is how fast it is moving, velocity is mass and speed
speed the direction, velocity is how fast it is moving
20
Elements on the Periodic Table are arranged in the order of increasing ___________________.
neutrons
electrons
Atomic #
mass of nuclues
21
All the mass of an atom can be found in the _____________.
nucleus
protons
orbitals
electrons
22
Is the following chemical equation balanced or unbalanced?
balanced
unbalanced
23
Which is the best example of Newton's Third Law?
a rocket taking off from earth
a rocket that is accelerating through space
a rocket sitting on the ground preparing for takeoff
24
The atomic mass contains which subatomic particles?
neutrons
both neutrons and protons
protons
electrons
25
The elements or substances before a chemical reaction occur are called _______________.
reactions
coefficients
reactants
products
26
Which of the following is the best example of Newton's First Law?
a rocket sitting on the ground preparing for takeoff
a rocket taking off from earth
a rocket accelerating through space
27
If an atom has 4 protons and 4 electrons what is the charge of the atom?
neutral
negative
positive
28
Interpreting Speed Graphs
I
F
G
H
29
The motion graph represents...
Constant acceleration
Constant motion
Stationary movement
Non-constant motion
30
Atoms are mostly empty space.
True
False
31
Motion Graphs
2
4
1
3
32
All of these graphs are consistent with what type of motion?
constant velocity
objects at rest
zero acceleration
uniform acceleration
33
What is the atomic mass of this model?
2
4
6
34
Which is an example of Newton's Second Law?
a rocket taking off from earth
a rocket sitting on the ground preparing for takeoff
a rocket that is accelerating through space due to it's mass
35
What does this graphic represent?
Compounds
Mixture of Elements
Solution
Mixture of Atoms
36
Which part of the chemical equation represents the chemical reaction?
addition sign
chemical symbols
yield sign
chemical formula
37
What is the speed of a train that traveled 244 km in 2 hours?
488 km/hr
24 km/hr
122 km/hr
244 km/hr
38
Elements in the same ____________ have the same number of energy levels/orbitals.
section
column
group
period
39
Elements with similar reactivity and chemical properties are located in the same _____________.
period
section
row
group
40
This type of element is located on the left of the stair step:
non-metals
metals
metalloids
gases
