Compounds with structures composed in a network pattern _________.
Have high melting points
have high boiling points
are always solid at room temperature
all of the above
Compounds made of molecules can be _____________ at room temperature.
solid
liquid
gas
All of the above
In metals their energy levels overlap. This allows their _________ to be able flow freely from one atom to the next.
protons
neutrons
electrons
atoms
A chemical bond is a force that holds atoms or ions together in a compound.
When a compound is created it will have the sam properties compared to the properties of elements of which it is composed.
When a chemical reaction occurs molecules are broken and atoms are rearranged.
Chemical structure describes the way atoms are bonded within a compound
Bonds cannot bend, stretch, or rotate.
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.
Compounds made of molecules have ________ bonds between each molecule, even though the bonds holding the atoms together within the molecule are ___________.
strong, weak
weak, strong
strong, strong
weak, weak
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.
7
6
9
8
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.
gain, lose
lose, gain
increase, decrease
An ionic is made of a ________ bonded to a ____________.
metal, non-metal
non-metal, to a metal
Nonmetals are
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
What type of model is this?
Space-filling model
Structural Formula
Ball and Stick
Space-fillling model
structural formula
ball and stick model
Ball and Stick model
How does a ionic compound form?
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
How does a covalent bond form?
the attraction between the nucleus and the shared electrons between them
Ionic Compounds _______ conduct electricity when melted or dissolved.
will
will not
Covalent Compounds _________ conducted electricity when melted or dissolved.
Which graph represents an object moving with a constant positive velocity?
A.
B.
C.
D.
Which graph represents an object at rest?
30 m/s westward represents a ____________.
Speed
Velocity
both speed and velocity
neither
If you jog for 1hr and travel 10 km, 10km/h describes your ____________.
momentum
displacement
average speed
acceleration
An object's speed is a measure of ___________.
how fast the object is moving
the object's direction
the object's displacement per unit of time
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.
instantaneous speed
instantaneous acceleration
Which graph represents a constant positive acceleration?
In order to determine if an object is moving, you must observe the object in relation to a(n) reference point.
What is distance?
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
What is displacement?
What is acceleration
A change in speed
A change in direction
A change in speed and direction
None of the above
The size of static friction is usually larger than the size of your sliding friction force
The size of your static friction is usually larger than the size of rolling friction force
The size of your rolling friction force was larger than the size of your sliding friction force.
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.
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
Which of the following is not accelerated motion
a ball being juggled
a woman walking at 2.5 m/s along a straight road
a satellite circling Earth
a braking cyclist
A tug of war that results in one team pulling the other across the line is an example of ____________.
action forces
reaction forces
balanced forces
unbalanced forces
Moving from 0 m/s to 25 m/s in 8.0 seconds equals an average acceleration of _________.
.32 m/s
.32 m/s^2
3.1 m/s
3.1 m/s^2
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?
14.5 m/s
14.5 m/s^2
5.5 m/s
5.5 m/s^2
The friction between the bristles of your toothbrush and the surfaces of your teeth is an example of __________ friction.
Rolling
Sliding
Static
Fluid
One way to reduce friction in a car engine is to add a(n) lubrication
What are the fundamental forces?
gravity
electromagnetic force
strong nuclear force
weak nuclear force
gravity and electromagnetic force only
The net force is the combination of all forces acting on an object.
Speed measured in an infinitely small time interval, like a speedometer, is called
net force
What is the measurement that correctly describes speed?
10km/min
9.81 m/s^2
5N
5m
25 m/s eastward
The measurement that correctly describes velocity is ______.
10 km/min
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.
The law that states that the unbalanced force acting on an object equals the object's mass times it acceleration is
Newtons First Law of Motion
Newton's Second Law of Motion
Newton's Third Law of Motion
the law of conservation of momentum
The law that states that for every action force there is an equal and opposite reaction force is
newton's first law of motion
newton's second law of motion
newton's third law of motion
law of conservation of momentum
The law that states that every object maintains a constance velocity unless acted on by an unbalanced force is
Newton's First Law of Motion
Newton's second law of motion
Which of the following is correct?
w=mg
w=m/g
w=g/m
w=g+m
What is the unbalanced force that slows down a ball rolling across the floor?
the force of friction
the force of gravity
the force of inertia
the force of momentum
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?
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
Astronauts "float" when inside an orbiting spaceship because they are
weightless
in a vaccum
in free fall
outside earth's gravity
Which of the following is an example of projectile motion?
a rolling bowling ball
a dart thrown at a dart board
a balloon risking in the air
a high speed train accelerating
Whenever a force is exerted, another force occurs that is _______ in size, and ________ in direction
equal, same
smaller, same
equal, opposite
smaller, opposite
The SI unit of force, named after the scientist who described the relationship between motion and force, is called the
Newton
einstein
curie
pasteur
If the net force on an object is zero, then the object has
According to the universal gravitation equation, the gravitional force between two objects decreases as ________ increases.
distance
mass
both
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.
What were the minumun requirements to earn a 90% on your bottle rocket?
empty carbonated bottle
fins
nose
A object stops accelerating when the force of air resistance becomes ______ the gravitational force on the object.
more than
less than
equal to
When the weight and air resistance are equal, a falling object reaches it's
projectile motion
terminal velocity
Our bottle rockets works from the upward push on the ________ which is equal to the downward push on the fluid.
fluid
bottle
air
The force of gravity ___________ increase as mass ___________. These are _________ proportional
increases, decreases, inversely
increases, increases, directly
The force of gravity __________ as distance ________. These are _______ proportional.
You flicked an index card forward, while the penny on top of the card remained stationary.
Newton's 1st Law of Motion
Newton's 2nd Law of Motion
Newton's 3rd Law of Motion
Your binder remained stationary, being pulled down by gravity and supported by the desk.
You rolled a heavy ball and a light ball with the same force to view their acceleration.
You rolled two balls with with the same mass, but with different forces to view their acceleration.
You dropped a ball at the same time you threw a ball to see which hit the ground first.
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.
The balloon-powered pinwheel spins because of action-reaction forces.
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.
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?
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.
Two components of projectile motion are horizontal gravitational acceleration and vertical gravitational acceleration.
The forces that hold different atoms or ions together are
electric currents
chemical bonds
physical bonds
nuclear forces
An ionic bond is a bond that forms between
ions with opposite charges
atoms with neutral charges
one atom's nucleus and another atom's electrons
the electrons of two different atoms
In which type of bond do atoms share electrons?
ionic
covalent
metallic
polatomic
Is this an endothermic or exothermic reaction?
endothermic
exothermic
If one measured the temperature of the chemicals reacting in Figure 2, what would have happened to the temperature as the chemical reaction progressed?
the temperature would drop
the temperature would rise
the temperature would remain constant
this cannot be determined with the information provided
The arrangement of _______ and _________ within a substance is its chemical structure
elements
ions
In ionic compounds, the positively charged ions are formed from non-metal elements
What is the name of BeF^2
Beryllium Flouride
Beryllium Floroxide
What is the chemical formula for Potassium Oxide is K^2O
Photosynthesis is an example of a(n) _________ chemical reaction in which plants absorb the sunlight to make glucose and oxygen
The energy need to start a chemical reaction is called
activation energy
reactancts
kinetic energy
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.
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.
What does W for J stand for?
Work
Watt
What does W the unit stand for?
What conclusion(s) could draw from the level lab #1 which you completed in class
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
Machines make work less
The AMA must alway be greater than the IMA when there is NO friction
A first class lever can have an input force greater than the output force
A second-class lever always has an input force that is less than the output force.
Increasing the angle a ramp makes with the horizontal decrease the mechanical advantage
Increasing the height of a ramp increases the efficiency of a ramp
A meteorologist trying to predict global warming would consider Earth to be a closed system
A pair of tweezers is
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
What is the mechanical advantage of a ramp 2.0 m long and .50 m tall?
1.0
2.5
4
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?
57N
280 N
285N
1425N
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.
.15m/s^2
1.7 m/s^2
6.6 m/s^2
9.8 m/s^2
The law of conservation of energy states that energy
is created from motion
cannot be created or destroyed
is always equal and opposite
can only be converted into heat
Which of the following processes requires the most work?
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
all levers have a rigid arm that turns around a point called the fulcrum
a(n) wedge is a inclined plane wrapped around a cylinder
The process that transform light into chemical energy in plants is called photosynthesis
What does I in IMA stand for?
Ideal
Inverse
What does the A in AMA stand for?
Actual
Adverse
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 __________.
multiplies the force, less, more
multiplies the distance, less, more
multiplies the force, more, less
multiplies the distance, more, less
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 __________.
If the MA is equal to one, it means that the machine _________
changes the direction
multiplies the force
multiplies the distance