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Duplicate of 8th Grade Chemistry and Physics Flashcards | StudBud
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Duplicate of 8th Grade Chemistry and Physics
Duplicate of 8th Grade Chemistry and Physics
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Review of 8th grade Chemistry and Physics concepts
Flashcards
36 cards
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Practice quiz
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Questions
36
Answers
1
The atomic mass contains which subatomic particles?
neutrons
both neutrons and protons
protons
electrons
2
When does an object have greatest kinetic energy and least potential energy
highest point
lowest point
3
Elements with similar reactivity and chemical properties are located in the same _____________.
period
section
row
group
4
Atoms are mostly empty space.
True
False
5
All the mass of an atom can be found in the _____________.
electrons
orbitals
nucleus
protons
6
The best definition of Newton's first law is...
an object's motion depends on its acceleration
an object will remain in motion even if there is friction
an object's motion is dependent on unbalanced forces
an object's motion depends on it's mass
7
What is the atomic number of this model?
6
2
4
8
What does this graphic represent?
Mixture of Atoms
Solution
Compounds
Mixture of Elements
9
Elements on the Periodic Table are arranged in the order of increasing ___________________.
neutrons
electrons
Atomic #
mass of nuclues
10
What does the graphic represent?
Compound
Mixture
Element
Oxygen
11
How many atoms are below?
4
8
10
2
12
How long would it take to travel 440 km at 44 km/hr
100 hours
10 km/hr
44 hours
10 hours
13
Which is an example of Newton's Second Law?
a rocket that is accelerating through space due to it's mass
a rocket taking off from earth
a rocket sitting on the ground preparing for takeoff
14
What does this graphic represent?
Compound Molecules
Mixture of Molecules
Atoms
15
Under which of the following conditions would the change in an objects speed be greatest?
a small net force applied to a light object
small net force applied to a heavy object
large net force applied to a heavy object
a large net force applied to a light object
16
Which best summarizes the difference between speed and velocity?
speed is how fast it is moving, velocity is not speed
speed the direction, velocity is how fast it is moving
speed is how fast it is moving, velocity is mass and speed
speed is how fast it moves, velocity is speed & direction
17
Electrons on the outermost shell are called:
electron cloud
valence electrons
elements
outer electrons
18
Is this chemical equation balanced or unbalanced ?
balanced
unbalanced
19
How many elements are below?
12
24
6
3
20
Atoms of different elements ALWAYS have different number of protons.
True
False
21
Which part of the chemical equation represents the chemical reaction?
addition sign
yield sign
chemical formula
chemical symbols
22
Some toys are battery operated, which of the following transformations take place in a toy?
chemical to electrical to heat energy
mechanical to heat to light energy
electrical to mechanical to heat energy
heat to chemical to electrical energy
23
What is the atomic mass of this model?
4
2
6
24
Is the following chemical equation balanced or unbalanced?
unbalanced
balanced
25
What is the speed of a train that traveled 244 km in 2 hours?
24 km/hr
122 km/hr
488 km/hr
244 km/hr
26
The elements or substances before a chemical reaction occur are called _______________.
reactants
coefficients
reactions
products
27
This type of element is located on the left of the stair step:
non-metals
gases
metalloids
metals
28
How many molecules are below?
3
9
2
6
29
A car travels an average speed of 70 km/hr. How far does it travel in 3 hours?
21 hours
210 hours
210 km
21 km
30
Which is the best example of Newton's Third Law?
a rocket taking off from earth
a rocket sitting on the ground preparing for takeoff
a rocket that is accelerating through space
31
A gardener applies a force of 50 N and moves a rock 1.5 meters. How much work does he do?
75 joules
50 joules
80 joules
25 joules
32
Elements in the same ____________ have the same number of energy levels/orbitals.
group
period
section
column
33
In neutral atoms, the # of protons = the # of ______________.
elements
electrons
atoms
neutrons
34
Which of the following is the best example of Newton's First Law?
a rocket taking off from earth
a rocket accelerating through space
a rocket sitting on the ground preparing for takeoff
35
What does this graphic represent?
Mixture of Atoms
Solid
Element
Compound
36
If an atom has 4 protons and 4 electrons what is the charge of the atom?
positive
negative
neutral
