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Science Exam 2015

Description

This is study prep for the spring semester exam. It goes over all of the questions from the quizzes and tests that Mrs. Malinowski gave us. This is for USN eighth grade students. It include Chapter 6, 7, 11, 12, and 13
josierobins
Quiz by josierobins, updated more than 1 year ago
josierobins
Created by josierobins over 9 years ago
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Resource summary

Question 1

Question
Compounds with structures composed in a network pattern _________.
Answer
  • Have high melting points
  • have high boiling points
  • are always solid at room temperature
  • all of the above

Question 2

Question
Compounds made of molecules can be _____________ at room temperature.
Answer
  • solid
  • liquid
  • gas
  • All of the above

Question 3

Question
In metals their energy levels overlap. This allows their _________ to be able flow freely from one atom to the next.
Answer
  • protons
  • neutrons
  • electrons
  • atoms

Question 4

Question
A chemical bond is a force that holds atoms or ions together in a compound.
Answer
  • True
  • False

Question 5

Question
When a compound is created it will have the sam properties compared to the properties of elements of which it is composed.
Answer
  • True
  • False

Question 6

Question
When a chemical reaction occurs molecules are broken and atoms are rearranged.
Answer
  • True
  • False

Question 7

Question
Chemical structure describes the way atoms are bonded within a compound
Answer
  • True
  • False

Question 8

Question
Bonds cannot bend, stretch, or rotate.
Answer
  • True
  • False

Question 9

Question
The chemical structure of a compound determines the properties of that compound. For instance a network of ions behave differently that a compound of molecules.
Answer
  • True
  • False

Question 10

Question
Compounds made of molecules have ________ bonds between each molecule, even though the bonds holding the atoms together within the molecule are ___________.
Answer
  • strong, weak
  • weak, strong
  • strong, strong
  • weak, weak

Question 11

Question
Atoms will bond with other atoms so they have ______ valence electrons (except for hydrogen and helium, which will still have two) in order to become chemically stable.
Answer
  • 7
  • 6
  • 9
  • 8

Question 12

Question
Metals tend to __________ valence electrons when they react to form an ionic bond, and non-metals tend to _________ valence electrons when they react to form a ionic bond.
Answer
  • gain, lose
  • lose, gain
  • increase, decrease

Question 13

Question
An ionic is made of a ________ bonded to a ____________.
Answer
  • metal, non-metal
  • non-metal, to a metal

Question 14

Question
Nonmetals are
Answer
  • flexible (they can bend and stretch without breaking,)
  • malleable (the can be pounded into thing sheets)
  • ductile (they can be drawn into thin wires)
  • none of the above

Question 15

Question
What type of model is this?
Image:
98295511-643d-4696-9894-b5d5c5cac4d5 (image/jpg)
Answer
  • Space-filling model
  • Structural Formula
  • Ball and Stick

Question 16

Question
What type of model is this?
Image:
ef6b90dc-eb1c-49bb-9280-441a8737eb39.gif (image/gif)
Answer
  • Space-fillling model
  • structural formula
  • ball and stick model

Question 17

Question
What type of model is this?
Image:
b662d8dc-ddcd-4ec5-bd4c-ec13f10cc06e (image/jpg)
Answer
  • Space-filling model
  • Structural Formula
  • Ball and Stick model

Question 18

Question
How does a ionic compound form?
Answer
  • the attraction between oppositely charged ions
  • the attraction between the nucleus, and the shared electrons between them
  • the attraction between an atom's nucleus and the neighboring atom's electrons

Question 19

Question
How does a covalent bond form?
Answer
  • the attraction between oppositely charged ions
  • the attraction between the nucleus and the shared electrons between them
  • the attraction between an atom's nucleus and the neighboring atom's electrons

Question 20

Question
Ionic Compounds _______ conduct electricity when melted or dissolved.
Answer
  • will
  • will not

Question 21

Question
Covalent Compounds _________ conducted electricity when melted or dissolved.
Answer
  • will
  • will not

Question 22

Question
Which graph represents an object moving with a constant positive velocity?
Image:
b969ef65-becd-4a71-800e-60d80ae17e79 (image/png)
Answer
  • A.
  • B.
  • C.
  • D.

Question 23

Question
Which graph represents an object at rest?
Image:
9827ba67-63ab-4c26-bccb-de8c3de02107 (image/png)
Answer
  • A.
  • B.
  • C.
  • D.

Question 24

Question
30 m/s westward represents a ____________.
Answer
  • Speed
  • Velocity
  • both speed and velocity
  • neither

Question 25

Question
If you jog for 1hr and travel 10 km, 10km/h describes your ____________.
Answer
  • momentum
  • displacement
  • average speed
  • acceleration

Question 26

Question
An object's speed is a measure of ___________.
Answer
  • how fast the object is moving
  • the object's direction
  • the object's displacement per unit of time
  • all of the above

Question 27

Question
A Car travels a distance of 210 miles in exactly 4h. The driver calculates that he traveled 52.5 mi/h. Which of the following terms most nearly describes his calculation.
Answer
  • average speed
  • instantaneous speed
  • instantaneous acceleration
  • displacement

Question 28

Question
Which graph represents a constant positive acceleration?
Image:
3c686343-4c3e-484a-b03a-fe45f1c3e226 (image/png)
Answer
  • A.
  • B.
  • C.
  • D.

Question 29

Question
In order to determine if an object is moving, you must observe the object in relation to a(n) reference point.
Answer
  • True
  • False

Question 30

Question
What is distance?
Answer
  • how far you've traveled
  • how far apart you are from your starting point
  • how far you've traveled AND how far apart you are from your starting point
  • none of the above

Question 31

Question
What is displacement?
Answer
  • how far you've traveled
  • how far apart you are from your starting point
  • how far you've traveled AND how far apart you are from your starting point
  • none of the above

Question 32

Question
What is acceleration
Answer
  • A change in speed
  • A change in direction
  • A change in speed and direction
  • None of the above

Question 33

Question
The size of static friction is usually larger than the size of your sliding friction force
Answer
  • True
  • False

Question 34

Question
The size of your static friction is usually larger than the size of rolling friction force
Answer
  • True
  • False

Question 35

Question
The size of your rolling friction force was larger than the size of your sliding friction force.
Answer
  • True
  • False

Question 36

Question
If you pulled a book forward, at a constant speed, and the spring scale read 5 N, which of the following conclusions would be correct.
Answer
  • The forces are unbalanced because the book is moving at a constant speed
  • The force of friction would be 0 Newtons because the the Newt force is 0 Newtons
  • The force of friction would 5 newton's because the net force is 0 Newtons.
  • All of the above are incorrect

Question 37

Question
Which of the following is not accelerated motion
Answer
  • a ball being juggled
  • a woman walking at 2.5 m/s along a straight road
  • a satellite circling Earth
  • a braking cyclist

Question 38

Question
A tug of war that results in one team pulling the other across the line is an example of ____________.
Answer
  • action forces
  • reaction forces
  • balanced forces
  • unbalanced forces

Question 39

Question
Moving from 0 m/s to 25 m/s in 8.0 seconds equals an average acceleration of _________.
Answer
  • .32 m/s
  • .32 m/s^2
  • 3.1 m/s
  • 3.1 m/s^2

Question 40

Question
A cyclist is traveling at an initial speed of 10.0 m/s. She accelerates at a rate of 0.500 m/s^2. What is her final speed after 9.0 seconds?
Answer
  • 14.5 m/s
  • 14.5 m/s^2
  • 5.5 m/s
  • 5.5 m/s^2

Question 41

Question
The friction between the bristles of your toothbrush and the surfaces of your teeth is an example of __________ friction.
Answer
  • Rolling
  • Sliding
  • Static
  • Fluid

Question 42

Question
One way to reduce friction in a car engine is to add a(n) lubrication
Answer
  • True
  • False

Question 43

Question
What are the fundamental forces?
Answer
  • gravity
  • electromagnetic force
  • strong nuclear force
  • weak nuclear force
  • all of the above
  • gravity and electromagnetic force only

Question 44

Question
The net force is the combination of all forces acting on an object.
Answer
  • True
  • False

Question 45

Question
Speed measured in an infinitely small time interval, like a speedometer, is called
Answer
  • instantaneous acceleration
  • instantaneous speed
  • net force

Question 46

Question
What is the measurement that correctly describes speed?
Answer
  • 10km/min
  • 9.81 m/s^2
  • 5N
  • 5m
  • 25 m/s eastward

Question 47

Question
The measurement that correctly describes velocity is ______.
Answer
  • 10 km/min
  • 9.81 m/s^2
  • 5N
  • 5m
  • 25 m/s eastward

Question 48

Question
Two different ways that static friction and kinetic friction differ from each other is static is the friction between two surfaces at rest and in contact. Kinetic friction is friction between a surface the is moving and another surface. Static Friction is greater than kinetic friction.
Answer
  • True
  • False

Question 49

Question
The law that states that the unbalanced force acting on an object equals the object's mass times it acceleration is
Answer
  • Newtons First Law of Motion
  • Newton's Second Law of Motion
  • Newton's Third Law of Motion
  • the law of conservation of momentum

Question 50

Question
The law that states that for every action force there is an equal and opposite reaction force is
Answer
  • newton's first law of motion
  • newton's second law of motion
  • newton's third law of motion
  • law of conservation of momentum

Question 51

Question
The law that states that every object maintains a constance velocity unless acted on by an unbalanced force is
Answer
  • Newton's First Law of Motion
  • Newton's second law of motion
  • newton's third law of motion
  • law of conservation of momentum

Question 52

Question
Which of the following is correct?
Answer
  • w=mg
  • w=m/g
  • w=g/m
  • w=g+m

Question 53

Question
What is the unbalanced force that slows down a ball rolling across the floor?
Answer
  • the force of friction
  • the force of gravity
  • the force of inertia
  • the force of momentum

Question 54

Question
In absense of air resistance, how would the acceleration of a 1.5 kg book and the acceleration of 15 kg rock differ if the objects were dropped from the same height?
Answer
  • The book would accelerate twice as fast as the rock
  • The rock would accelerate twice as fast as the book
  • The book would accelerate ten times as fast as the rock
  • They would not differ; they would be the same

Question 55

Question
Astronauts "float" when inside an orbiting spaceship because they are
Answer
  • weightless
  • in a vaccum
  • in free fall
  • outside earth's gravity

Question 56

Question
Which of the following is an example of projectile motion?
Answer
  • a rolling bowling ball
  • a dart thrown at a dart board
  • a balloon risking in the air
  • a high speed train accelerating

Question 57

Question
Whenever a force is exerted, another force occurs that is _______ in size, and ________ in direction
Answer
  • equal, same
  • smaller, same
  • equal, opposite
  • smaller, opposite

Question 58

Question
The SI unit of force, named after the scientist who described the relationship between motion and force, is called the
Answer
  • Newton
  • einstein
  • curie
  • pasteur

Question 59

Question
If the net force on an object is zero, then the object has
Answer
  • reaction forces
  • action forces
  • unbalanced forces
  • balanced forces

Question 60

Question
According to the universal gravitation equation, the gravitional force between two objects decreases as ________ increases.
Answer
  • distance
  • mass
  • both
  • neither

Question 61

Question
A situation known as free fall occurs when astronauts and their surroundings all accelerate at at the same rate. When this occurs the astronauts seem to be weightless.
Answer
  • True
  • False

Question 62

Question
What were the minumun requirements to earn a 90% on your bottle rocket?
Answer
  • empty carbonated bottle
  • fins
  • nose
  • all of the above
  • none of the above

Question 63

Question
A object stops accelerating when the force of air resistance becomes ______ the gravitational force on the object.
Answer
  • more than
  • less than
  • equal to

Question 64

Question
When the weight and air resistance are equal, a falling object reaches it's
Answer
  • net force
  • instantaneous acceleration
  • projectile motion
  • terminal velocity

Question 65

Question
Our bottle rockets works from the upward push on the ________ which is equal to the downward push on the fluid.
Answer
  • fluid
  • bottle
  • air

Question 66

Question
The force of gravity ___________ increase as mass ___________. These are _________ proportional
Answer
  • increases, decreases, inversely
  • increases, increases, directly

Question 67

Question
The force of gravity __________ as distance ________. These are _______ proportional.
Answer
  • increases, decreases, inversely
  • increases, increases, directly

Question 68

Question
You flicked an index card forward, while the penny on top of the card remained stationary.
Answer
  • Newton's 1st Law of Motion
  • Newton's 2nd Law of Motion
  • Newton's 3rd Law of Motion

Question 69

Question
Your binder remained stationary, being pulled down by gravity and supported by the desk.
Answer
  • Newton's 1st Law of Motion
  • Newton's 2nd Law of Motion
  • Newton's 3rd Law of Motion

Question 70

Question
You rolled a heavy ball and a light ball with the same force to view their acceleration.
Answer
  • Newton's 1st Law of Motion
  • Newton's 2nd Law of Motion
  • Newton's 3rd Law of Motion

Question 71

Question
You rolled two balls with with the same mass, but with different forces to view their acceleration.
Answer
  • Newton's 1st Law of Motion
  • Newton's 2nd Law of Motion
  • Newton's 3rd Law of Motion

Question 72

Question
You dropped a ball at the same time you threw a ball to see which hit the ground first.
Answer
  • Newton's 1st Law of Motion
  • Newton's 2nd Law of Motion
  • Newton's 3rd Law of Motion

Question 73

Question
Your bottle rocket exerted a downward force as the pressurized air escaped from the bottle, which exerted a an equal but opposite force in the opposite dirction causing the rocket to move upward.
Answer
  • Newton's 1st Law of Motion
  • Newton's 2nd Law of Motion
  • Newton's 3rd Law of Motion

Question 74

Question
The balloon-powered pinwheel spins because of action-reaction forces.
Answer
  • Newton's 1st Law of Motion
  • Newton's 2nd Law of Motion
  • Newton's 3rd Law of Motion

Question 75

Question
The Newton's cradle had one ball dropped, which hit the group of balls, and then one ball was pushed up on the opposite side.
Answer
  • Newton's 1st Law of Motion
  • Newton's 2nd Law of Motion
  • Newton's 3rd Law of Motion

Question 76

Question
If you drop a medicine ball and a basket ball at the same time, how can they accelerate at the same rate, regardless of mass?
Answer
  • They don't
  • The more mass an object has the more inertia. The less mass the object has the less inertia.
  • Even though the medicine ball has more mass, therefore more gravity, it also has more inertia. Object near earth fall at 9.8 m/s^2 because of this.

Question 77

Question
Two components of projectile motion are horizontal gravitational acceleration and vertical gravitational acceleration.
Answer
  • True
  • False

Question 78

Question
The forces that hold different atoms or ions together are
Answer
  • electric currents
  • chemical bonds
  • physical bonds
  • nuclear forces

Question 79

Question
An ionic bond is a bond that forms between
Answer
  • ions with opposite charges
  • atoms with neutral charges
  • one atom's nucleus and another atom's electrons
  • the electrons of two different atoms

Question 80

Question
In which type of bond do atoms share electrons?
Answer
  • ionic
  • covalent
  • metallic
  • polatomic

Question 81

Question
Is this an endothermic or exothermic reaction?
Image:
ec8bcdb4-b100-49f5-b485-2bb8b348387a.gif (image/gif)
Answer
  • endothermic
  • exothermic

Question 82

Question
If one measured the temperature of the chemicals reacting in Figure 2, what would have happened to the temperature as the chemical reaction progressed?
Image:
f95db7c1-55b3-40e3-a56c-83596323d9fe.gif (image/gif)
Answer
  • the temperature would drop
  • the temperature would rise
  • the temperature would remain constant
  • this cannot be determined with the information provided

Question 83

Question
The arrangement of _______ and _________ within a substance is its chemical structure
Answer
  • atoms
  • electrons
  • protons
  • elements
  • ions

Question 84

Question
In ionic compounds, the positively charged ions are formed from non-metal elements
Answer
  • True
  • False

Question 85

Question
What is the name of BeF^2
Answer
  • Beryllium Flouride
  • Beryllium Floroxide

Question 86

Question
What is the chemical formula for Potassium Oxide is K^2O
Answer
  • True
  • False

Question 87

Question
Photosynthesis is an example of a(n) _________ chemical reaction in which plants absorb the sunlight to make glucose and oxygen
Answer
  • endothermic
  • exothermic

Question 88

Question
The energy need to start a chemical reaction is called
Answer
  • activation energy
  • reactancts
  • kinetic energy

Question 89

Question
Describe how the chemical structure of a compound affects its properties. Use the evidence collected in our lab testing the properties of salt and sugar to support your arguments.
Answer
  • When a compound has strong bonds or weak bonds, it affect their properties. For example, sugar had a low melting point because it had weak bonds. Salt, on the other hand, would not melt because it had a high melting point the requires much more heat because it has strong bonds.
  • When a compound has strong bonds or weak bonds, it affect their properties. For example, salt had a low melting point because it had weak bonds. sugar, on the other hand, would not melt because it had a high melting point the requires much more heat because it has strong bonds.

Question 90

Question
What does W for J stand for?
Answer
  • Work
  • Watt

Question 91

Question
What does W the unit stand for?
Answer
  • Watt
  • Work

Question 92

Question
What conclusion(s) could draw from the level lab #1 which you completed in class
Answer
  • Levers do not have friction
  • the input work and the output work in a lever are equal
  • The IMA and AMA are equal
  • The Efficiency is 100 %
  • All of the above are true

Question 93

Question
Machines make work less
Answer
  • True
  • False

Question 94

Question
The AMA must alway be greater than the IMA when there is NO friction
Answer
  • True
  • False

Question 95

Question
A first class lever can have an input force greater than the output force
Answer
  • True
  • False

Question 96

Question
A second-class lever always has an input force that is less than the output force.
Answer
  • True
  • False

Question 97

Question
Increasing the angle a ramp makes with the horizontal decrease the mechanical advantage
Answer
  • True
  • False

Question 98

Question
Increasing the height of a ramp increases the efficiency of a ramp
Answer
  • True
  • False

Question 99

Question
A meteorologist trying to predict global warming would consider Earth to be a closed system
Answer
  • True
  • False

Question 100

Question
A pair of tweezers is
Answer
  • a first-class lever
  • a compound machine made of two third-class levers
  • a compound machine made of two second-class levers
  • a kind of wedge

Question 101

Question
What is the mechanical advantage of a ramp 2.0 m long and .50 m tall?
Answer
  • 1.0
  • 2.5
  • 4
  • None of the above

Question 102

Question
A pulley with a mechanical advantage of 5.00 is used to lift a bucket weighing 285 N. How much force must be used to lift the bucket?
Answer
  • 57N
  • 280 N
  • 285N
  • 1425N

Question 103

Question
An astronaut with a mass of 91kg is .30 m above the moon's surface. The astronaut's potential energy is 46J. Calculate the free fall acceleration on the moon.
Answer
  • .15m/s^2
  • 1.7 m/s^2
  • 6.6 m/s^2
  • 9.8 m/s^2

Question 104

Question
The law of conservation of energy states that energy
Answer
  • is created from motion
  • cannot be created or destroyed
  • is always equal and opposite
  • can only be converted into heat

Question 105

Question
Which of the following processes requires the most work?
Answer
  • A 10kg weight rests on the table
  • A person holds a 1kg weight still with outstretched arms
  • a person lifts a 1kg weight 1m off the floor
  • a 10 kg ball is rolled .1 N across the floor at a constant speed for 10m

Question 106

Question
all levers have a rigid arm that turns around a point called the fulcrum
Answer
  • True
  • False

Question 107

Question
a(n) wedge is a inclined plane wrapped around a cylinder
Answer
  • True
  • False

Question 108

Question
The process that transform light into chemical energy in plants is called photosynthesis
Answer
  • True
  • False

Question 109

Question
What does I in IMA stand for?
Answer
  • Ideal
  • Inverse

Question 110

Question
What does the A in AMA stand for?
Answer
  • Actual
  • Adverse

Question 111

Question
If the mechanical advantage is greater than one, it means that the machine ______________. In normal everyday English, this means that your force is ______ and the machines force is __________.
Answer
  • multiplies the force, less, more
  • multiplies the distance, less, more
  • multiplies the force, more, less
  • multiplies the distance, more, less

Question 112

Question
If the mechanical advantage is less than one, it means that the machine ______________. In normal everyday, this means that your distance is _______ and the machine's distance is __________.
Answer
  • multiplies the distance, less, more
  • multiplies the distance, more, less

Question 113

Question
If the MA is equal to one, it means that the machine _________
Answer
  • changes the direction
  • multiplies the force
  • multiplies the distance
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