Energy
2, 4
During which segments are two states of matter present?
light energy
Energy in the form of moving waves of light
chemical energy
Energy stored in chemical bonds
specific heat
amount needed to raise the temp for a gram of a substance
kinetic energy decreases as potential energy increases
A ball is projected into the air. Describe the change(s) in potential and kinetic energy.
its transformed into thermal energy
A gasoline engine transforms approximately 34 percent of the fuel's chemical energy into mechanical energy. If energy is conserved, what happens to the other 66 percent?
46°C
According to the cooling curve, what is the approximate freezing point of the substance?
kinetic and some is potential
As a skateboarder moves downhill, some of the energy of the skateboarder is
absorbs, increases
As temperature rises from 25°C to 60°C, the material _______ heat and its kinetic energy _________ as the material goes through vaporization to become a gas.
not all potential energy is converted into kinetic energy
Because of friction
electromagnetic waves
Cell phones contain rechargeable batteries that transform chemical energy into electrical energy. When using your cell phone, electrical energy is first transformed into ________________ that are transmitted through the air.
it will take 140 min, as the gas changes state,droplets of the gas
Consider the heating curve of water. As one moves along the line graph, through region III, the following statements apply. You may choose more than one answer.
the water temp is increasing, the time elapsed is twentyfive min, the kinetic energy of the molecules are increasing.
Consider the heating curve of water. As one moves along the line graph, through region III, the following statements apply. You may choose more than one answer.
Absorbed energy results in the change in potential energy.
Examine the graph. Select the statement that best describes the energy change in the particles of a substance during melting.
QR - liquid only RS - phase change liquid gas ST - gas only
In the graph, a sample of water is heated from 40 degrees Celsius to 100 degrees Celsius. Which statement correctly describes the curve?
hanging 50 meters from the ground
In which position would an object have a greater amount of potential energy.
Using a generator
In which situation is mechanical energy converted to electrical energy?
3
Liquid water first appears after _______ minutes?
heat and light energy
Maria's father started a fire in the fireplace. He crumpled some paper, lit a match, and soon the logs in the fireplace were burning. In this case, the stored chemical energy in the logs was changed into
NaCL
Predict which molecule will show a similar relationship between its heat of fusion and its heat of vaporization that water does.
Convection
Process by which, in a fluid being heated, the warmer part of the mass will rise and the cooler portions will sink.
Conduction
The direct transfer of heat from one substance to another substance that it is touching. direct
electrical energy
The energy of electric charges
80c
The graph represents the cooling curve of ethyl alcohol. Determine the boiling point of ethyl alcohol.
phase changes
The heating curve of an ice-water mixture that is slowly heated to 125°C contains three sloped and two level portions. What do the two level portions in the graph represent?
potential energy is converted to kinetic
The rock in the picture is pushed over the edge and it begins to fall. Which type of energy conversion is taking place?
Temperature increases. Particles spread apart. Kinetic energy increases. Particle motion increases.
The three states of matter are modeled in the heating curve seen here. Identify ALL of the changes that must take place for a substance to change state, from a solid to a gas.
radiation
The transfer of energy by electromagnetic waves
heat energy
This is the form of energy that is transferred because of a difference in temperature.
chemical and mechanical
We have to eat in order to carry out all of our bodily processes. What type of energy trasformation is taking place when we use that digested food in order to run?
The kinetic energy and the entropy of the water molecules increases through fusion.
What conclusion can be drawn about the heat of fusion of water from the heating curve?
The energy of the system decreases.
What statement BEST explains the plateau seen in the cooling curve of naphthalene?
Moving from A to C the temperature and the kinetic energy increases.
Which is the MOST accurate statement about the heating curve and energy?
48c
Which value is MOST likely to be the boiling point of the substance at this constant pressure?
law of conservation and matter
energy cant be created or destroyed
light energy
energy in the form of electromagnetic radiation
what is energy
energy is an abstract concept that is difficult to define concisely
kinetic energy
energy of motion
Q= mcΔT
formula
potential energy
stored energy that results from the position or shape of an object
energy
the capacity for doing work. it may be transformed from one form to another
electromagnet
this is a strong, short lived magnet created by a looped electrical currrent
thermal expansion
this type of physical weathering occurs in places where there is a large change in daily temps.
a large toaster oven
which example show electrical energy being transformed into heat energy?
The sun
which is an example of nuclear energy being converted into heat and light energy?
semi truck with 1 million pounds of goods in it
which item has the most potential energy at the same height?
in a computer, electrical energy is transformed into sound. light, and heat
which statement is true?