stud
bud
Sign up
Log in
Home
Library
Explore
SAT
More
8th Grade Chemistry and Physics Flashcards | StudBud
Explore
/
8th Grade Chemistry and Physics
8th Grade Chemistry and Physics
36 terms
·
StudBud Administration
·
1,102 plays
Review of 8th grade Chemistry and Physics concepts
Flashcards
36 cards
F
Practice quiz
P
Host live
L
Questions
36
Answers
1
Elements with similar reactivity and chemical properties are located in the same _____________.
group
row
section
period
2
All the mass of an atom can be found in the _____________.
orbitals
nucleus
protons
electrons
3
What is the speed of a train that traveled 244 km in 2 hours?
244 km/hr
488 km/hr
122 km/hr
24 km/hr
4
Elements in the same ____________ have the same number of energy levels/orbitals.
section
column
period
group
5
Under which of the following conditions would the change in an objects speed be greatest?
a large net force applied to a light object
large net force applied to a heavy object
small net force applied to a heavy object
a small net force applied to a light object
6
Which best summarizes the difference between speed and velocity?
speed is how fast it is moving, velocity is mass and speed
speed is how fast it is moving, velocity is not speed
speed is how fast it moves, velocity is speed & direction
speed the direction, velocity is how fast it is moving
7
How many atoms are below?
8
4
2
10
8
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
9
The elements or substances before a chemical reaction occur are called _______________.
reactants
reactions
products
coefficients
10
Atoms are mostly empty space.
True
False
11
A car travels an average speed of 70 km/hr. How far does it travel in 3 hours?
210 hours
21 km
210 km
21 hours
12
How long would it take to travel 440 km at 44 km/hr
44 hours
10 hours
100 hours
10 km/hr
13
How many molecules are below?
9
6
3
2
14
Elements on the Periodic Table are arranged in the order of increasing ___________________.
mass of nuclues
neutrons
electrons
Atomic #
15
If an atom has 4 protons and 4 electrons what is the charge of the atom?
positive
neutral
negative
16
When does an object have greatest kinetic energy and least potential energy
highest point
lowest point
17
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
18
The atomic mass contains which subatomic particles?
neutrons
both neutrons and protons
protons
electrons
19
In neutral atoms, the # of protons = the # of ______________.
atoms
electrons
elements
neutrons
20
What does this graphic represent?
Solution
Compounds
Mixture of Elements
Mixture of Atoms
21
What is the atomic mass of this model?
4
2
6
22
What does this graphic represent?
Element
Solid
Mixture of Atoms
Compound
23
The best definition of Newton's first law is...
an object's motion is dependent on unbalanced forces
an object will remain in motion even if there is friction
an object's motion depends on it's mass
an object's motion depends on its acceleration
24
Is the following chemical equation balanced or unbalanced?
balanced
unbalanced
25
What is the atomic number of this model?
2
4
6
26
This type of element is located on the left of the stair step:
metals
metalloids
gases
non-metals
27
How many elements are below?
3
6
24
12
28
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
29
Is this chemical equation balanced or unbalanced ?
unbalanced
balanced
30
Some toys are battery operated, which of the following transformations take place in a toy?
mechanical to heat to light energy
electrical to mechanical to heat energy
chemical to electrical to heat energy
heat to chemical to electrical energy
31
A gardener applies a force of 50 N and moves a rock 1.5 meters. How much work does he do?
80 joules
25 joules
75 joules
50 joules
32
Electrons on the outermost shell are called:
valence electrons
electron cloud
elements
outer electrons
33
What does this graphic represent?
Atoms
Mixture of Molecules
Compound Molecules
34
What does the graphic represent?
Compound
Mixture
Element
Oxygen
35
Atoms of different elements ALWAYS have different number of protons.
False
True
36
Which part of the chemical equation represents the chemical reaction?
addition sign
yield sign
chemical formula
chemical symbols
