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8th Grade Fall Midterm Review (2016) Flashcards | StudBud
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8th Grade Fall Midterm Review (2016)
8th Grade Fall Midterm Review (2016)
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#chemistry #interdependence #physics
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Questions
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Answers
1
Which proves the Law of Conservation of Mass?
2H2O2 -> H2O + O2
4Fe + 3O2 -> 2Fe2O3
CH4 + 2O2 -> 2H2O + 2CO2
2
Which 2 elements have the same number of energy levels?
Li and Be
K and Ba
Rf and Cr
Sc and Y
3
Unbalanced forces cause an object to -
stop
speed up
accelerate
slow down
4
Where are electrons likely to be located in an oxygen atom?
8 near the nucleus, 8 farther out
1 near the nucleus, 7 farther out
all in the valence shell
2 near the nucleus, 6 farther out
5
In which picture is MORE work being done on the box?
left
neither
right
6
The chemical formula of a substance tells you -
the color of the substance
the number of atoms of each element
the arrangement of its atoms
the number of atoms in the entire substance
7
What is the correct atom count for H
3
PO
4
(phosphoric acid)?
H=3, P=1, O=4
H=12, P=4, O=4
H=3, P=0, O=4
H=3, P=4, O=4
8
All the elements in the orange group have -
the same number of energy levels
the same number of valence electrons
identical properties
similar masses
9
How many carbon atoms are present in three molecules of dichloromethane?
1
6
2
3
10
Describe the nucleus of an atom.
small, mostly empty space
vast, dense
small, dense
vast, voluminous
11
A compound contains -
one element
two or more elements
three or more elements
12
Describe this relationship.
consumer/producer
hunter/gatherer
predator/prey
parasite/host
13
Rutherford is known for -
identifying a dense nucleus with electrons orbiting it
determining the mass of protons and neutrons
naming invisible particles "atoms"
identifying the electron cloud
14
Which compound has the same number of atoms of hydrogen as dichloromethane?
H2O
CH4
Mg(H2PO4)2
NaHCO3
15
The majority of the periodic table is made up of -
metalloids
compounds
non-metals
metals
16
Pioneer species are -
the first organisms to inhabit a disturbed ecosystem
the last organisms to inhabit a restored ecosystem
heterotrophs
autotrophs
17
What is the object's average speed?
30 m/s2
5 m/s
36 m/s
5 m/s2
18
Determines -
velocity
acceleration
speed
distance
19
An atom's identity comes from its number of -
energy levels
nuclei
protons
valence electrons
20
As force applied decreases, acceleration -
increases
remains constant
decreases
21
Newton's 3rd Law
F=ma
force pairs (action-reaction)
inertia
22
What is the density of a brick that has a mass of 100 g and volume of 25 cm
3
?
4 g/cm3
2500 g/cm3
not enough info to calculate
.25 g/cm3
23
What is true of all chemical changes?
they produce a new substance
they produce light
they change color
they bubble
24
Valence electrons determine an element's -
charge
identity
reactivity
mass
25
At which points will the sled experience balanced forces (the path is slick and frictionless)?
the entire sled ride has unbalanced forces
B-C
A-B
A-C
26
An energy pyramid shows -
the amount of available energy at each trophic level
the organisms in an ecosystem
some feeding relationships in an ecosystem
all of the feeding relationships in an ecosystem
27
Which organisms are present in a climax community?
annual plants
shrubs
hardwood trees
softwood trees
28
Which describes the charge of a proton?
-
0
+
29
Describe this relationship.
predator/prey
hunter/gatherer
consumer/producer
parasite/host
30
What force is on an object with a mass of 10 kg and acceleration of 5 m/s
2
?
2 N
50 m/s
2.5 kg
50 N
31
Which is correct?
reactants yield products
products yield reactants
32
Which describes the charge of an electron?
0
-
+
33
Describe the energy transformation in this model.
nuclear -> mechanical -> light
thermal -> mechanical -> electrical -> light
thermal -> electrical -> light
mechanical -> thermal -> electrical - light
34
Biotic or abiotic?
abiotic
biotic
35
Which describes the charge of a neutron?
+
-
0
36
What is true of all physical changes?
they produce a new substance
they form a gas
they do not produce a new substance
they change color
37
Which story matches the graph?
acceleration for 2 sec., constant speed for 2 sec.
constant velocity for 2 sec., acceleration for 2 sec.
38
Name this family of elements.
Noble Gases
Transition Metals
Halogens
Alkali Metals
39
If frogs relocate due to drought, which organism will be most negatively affected?
grasshoppers
buzzards
snakes
dragonflies
40
Organic compounds must contain -
carbon and hydrogen
glucose
hydrogen
C, H, O, N, P, S
41
Which position(s) show(s) potential energy?
a and b
c and d
a and d
a and c
42
Newton's 2nd Law
force pairs (action-reaction)
inertia
F=ma
43
This model represents -
water
gold
a noble gas
a reactive metal
44
Which group is made of very reactive nonmetals?
2
18
1
17
45
Which has the greatest number of energy levels?
Li
Rb
Cs
Na
46
How many protons, neutrons, and electrons are present in an atom of sodium (Na)?
P=34, N=11, E=12
P=11, N=12, E=11
P=23, N=11, E=23
P=11, N=11, E=23
47
What allows organisms to survive environmental change?
adaptations
genetic modification
succession
climate change
48
Which statement is true about ecosystems?
lower biodiversity leads to greater sustainability
higher biodiversity leads to greater sustainability
higher biodiversity leads to lower sustainability
