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My report on "Heat and Temperature"
My report on "Heat and Temperature"
Student name: elie tawfik
Teacher name: rtasker
Class: IntegratedScience
School: integratedscience
Submission Time: 9/10/11 2:47 AM
Page 1 : http://mw2.concord.org/public/part2/heat/page1.cml
1. Compare the motion of the air molecules at high and low temperatures.
at low temperatures/(winter), the particle's random motion is very slow and they collide less with each other comparted to high summer temperatures where their random motion is very fast causing them to collide much more often and with higher momentum (1:27:08 AM)
Page 2 : http://mw2.concord.org/public/part2/heat/page2.cml
1. The temperature of a substance is related to:
(a) Only the speed of the atoms.
(b) The mass of the atoms.
(c) Both the speed and the mass of the atoms.
(d) Neither the speed nor the mass.
My answer is (c) (1:30:33 AM)
2. A substance composed of atoms A and another composed of atoms B are at the same temperature, but atom A is ten times more massive. How does the speed of A compare to the speed of B, on average?
the speed of A should be much slower than the speed of B as they both have the same temperatures which means similar kinetic energy. (1:40:04 AM)
3. Which type of atom has the greater mass?
(a) The pink atoms.
(b) The yellow atoms.
My answer is (a) (1:40:53 AM)
4. The yellow and pink atoms in the container are the same temperature. Use what you know about kinetic energy to explain what you observe in the model.
(what i observed is that the yellow balls are moving much faster compared to the purple balls).
since both types of balls have the same kinetic energy and K.E. is proportional to the mass of the particle and its velocity (E=1/2 Mv^2) then the larger the mass of a particle becomes, the slower its velocity will be, and this is why we observe the yellow balls moving much faster than the pink balls as they have a much lower mass)
(1:44:28 AM)
Page 3 : http://mw2.concord.org/public/part2/heat/page3.cml
1. What did you observe about the kinetic energy (KE) of the atoms? (hint❏)
(a) Some atoms have almost no KE.
(b) Each atom keeps the same KE.
(c) All atoms have the same KE.
(d) An atom's KE is changing all the time.
(e) Both A and D are true.
My answer is (e) (1:51:22 AM)
2. If we add another box to the model, the average kinetic energy of atoms within the box over time will (check all that apply):
(a) Be the same as that of all atoms.
(b) Be the same as that of the first box.
(c) Depend on its size.
(d) Depend on its location.
(e) Depend on how hot the gas is.
My answer is (a) (b) (e) (1:52:53 AM)
3. Describe how changing the number of atoms in the box (by changing the size) affects the temperature over time.
(a) Changing number increases temperature.
(b) Changing number decreases temperature.
(c) Changing number does not affect temperature.
(d) Impossible to predict.
My answer is (c) (1:53:27 AM)
4. How is the average KE affected by adding or subtracting heat?
adding heat would result in the increase of kinetic energy of the particlesm subrating heat would results in the decrease of the kinetic energy of the particles (1:54:11 AM)
Page 4 : http://mw2.concord.org/public/part2/heat/page4.cml
1. What will happen to the temperatures in the chambers if the temperature of the left one is higher than that of the right one?
(a) They both go up.
(b) They both go down.
(c) The temperature on the left goes up, and the temperature on the right goes down.
(d) The temperature on the left goes down, and the temperature on the right goes up.
My answer is (d) (1:56:46 AM)
2. What do you think happens that causes both chambers to reach the same temperature in the above simulation?
i think both rooms reach the same temperatures as the particles with high kinetic energy from the heated chamber with high temperatures moves into the other temperature colliding with slow particles found in the cold temperatures the energy is transfered to the slow particles speeding them up and increasing their kinetic energy and therefore temperature (1:58:25 AM)
Page 5 : http://mw2.concord.org/public/part2/heat/page5.cml
1. Write down the temperatures of the large and small solids after you have hit the "Add energy" button 10 times. Describe the relationship between the readings and the size of the solids.
temperature after 10 times was about 400 Kelvin, the smaller the solid, the higher its temperature becomes after adding the same ammount of energy to it (same as a large solid) (2:03:49 AM)
2. How many times do you need to click the "Add energy" button on the small solid to reach approximately the same temperature of the large solid after you hit the "Add energy" button 10 times?
(a) 1 click.
(b) 5 clicks.
(c) 10 clicks.
(d) Cannot determine.
My answer is (b) (2:03:49 AM)
Page 6 : http://mw2.concord.org/public/part2/heat/page6.cml
1. Which one in the above results in the fastest heat transfer between the hot and cold solid?
(a) Sponge
(b) Thick short bar
(c) Thin short bar
(d) Thick long bar
(e) Thin long bar
(f) Gas
My answer is (b) (2:12:09 AM)
2. A radiator heats a house by pumping a hot liquid through tubes folded as shown in the image on the left. What did you learn from the experiment on this page that can explain why the tube is made in such a shape?
they used such shape (thick short bars) as it has the fastest heat transfer between the hot and the cold solid which was demonstrated by the computer stimulation (2:15:27 AM)
Page 7 : http://mw2.concord.org/public/part2/heat/page7.cml
1. How is thermal radiation different from heat conduction in transferring heat? (Check all that apply)
(a) There is no difference.
(b) Thermal radiation may happen through photons, but heat conduction does not.
(c) Thermal radiation requires no contact of atoms, but heat conduction relies on atoms.
(d) Thermal radiation transfers heat faster than heat conduction.
My answer is (b) (c) (2:19:49 AM)
Page 8 : http://mw2.concord.org/public/part2/heat/page8.cml
1. Take a snapshot of the model that shows thermal expansion, and then follow the instruction below to drag in the snapshot image.
THERMAL EXPANSION (2:26:16 AM)
2. Take a snapshot of the graph that shows the increasing of energy when heated, and then follow the instruction below to drag in the snapshot image.
GRAPH INREASE IN ENERGY
(2:27:28 AM)
Page 9 : http://mw2.concord.org/public/part2/heat/page9.cml
1. What is true of the kinetic energy of each individual atom when a substance has reached a certain temperature?
(a) The kinetic energy of each atom is the same as every other atom.
(b) The average kinetic energy of each atom is the same as every other atom.
(c) Some atoms have a higher average kinetic energy.
(d) Some atoms have a lower average kinetic energy.
My answer is (b) (2:29:38 AM)
2. Which of the following means of heat transfer explains why Jane's hand was burned after she touched the hot pot?
(a) Conduction.
(b) Thermal radiation.
(c) Diffusion.
(d) None of the above.
My answer is (a) (2:29:36 AM)
3. When a hot and cold object are placed in contact, the hot one loses energy. Does this violate energy conservation? Why or why not?
NO, it does not violate the conservation of energy as there is no energy created or destroyed energy is only transfered from the hot object to the cold object which does not violate the theory (2:46:49 AM)
4. When you place a hot cup of tea down, why does the cup of tea get cooler and the counter get warmer? Be sure to talk about kinetic energy and temperature in your explanation.
this is because the particles of the cup have a high temperature ,therefore high kinetic energy (have fast random motion), when they come in contact with the slow moving particles of the counter with low temperature and kinetic energy, an equilibrium occurs where energy is transfered from the hotter particles to the cooler particles through their collision together resulting in the hot particles losing energy and cooler particles gaining this energy (2:32:57 AM)
5. A vacuum flask (sometimes called a Thermos bottle) is a double-wall container with a vacuum between the two walls. How does the flask keep its contents hotter than the outside air?
this is acheived as the vacuum between the walls is a very poor conductor of heat therefore it stops the heat from being conducted or transfered. (2:47:46 AM)
6. A gas contains equal numbers of atoms of radon (atomic mass = 222) and helium (atomic mass = 4). In equilibrium, which kind of atom is a) going faster, b) has more average KE, and c) is hotter? Explain your answers.
the atom with higher atomic mass (bigger mass) will be slower than the one with lower atomic mass. this is because both atoms in the same gas are in the same temperature therefore they both have the same kinetic energy. and since kinetic energy is proportional to mass and velocity then to keep the kinetic energy constant, as the mass of the particle increases then the particle's velocity should decrease and vise versa.
b) as mentioned above, both atoms should have the same kinetic energy as they are in equilibrium meaning that they both have the same temperature
c) they would also have the same ammount of heat as they would have the same kinetic energy
c) T(2:47:52 AM)
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