| Q1: |
how particle change solid to liquid |
subasree |
7/11/2013 |
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| Q2: |
CONCEPT OF HEAT AND TEMPERATURE ON THE BASIS OF KINETIC ENERGY OF MOLECULES. |
SHAHNAWAZ ALAM |
19/8/2013 |
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| Q3: |
effects of evaporation on the basis of kinetic theory of matter |
Siddharth |
19/8/2013 |
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| Q4: |
when 2 metals are put in a beaker of water and heated why are there bubbles seen on the metals |
avikesh narayan |
25/6/2011 |
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| Q5: |
using the kinetic theory, explian what causes gas pressure |
ben hazzard |
24/10/2010 |
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| Q6: |
what happens when meltig occurs |
bob |
22/4/2010 |
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| Q7: |
difference btwn caloric n kinetic theories of heat? |
aneka |
28/3/2010 |
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| Q8: |
recalll d role of joules experiments in establishing the principle of conservation of enrgy? |
aneka |
28/3/2010 |
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| Q9: |
How are boiling point, freezing point/melting point, kinetic theory, phase change, and the four states of matter related to each other? |
Jakela T |
6/1/2010 |
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| Q10: |
How does the study of heat relate to the kinetic theory of matter? |
Kiwanda Tindal |
8/11/2009 |
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| Q11: |
how the vapour condenses into a liquid? |
ong win nie |
2/2/2009 |
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| Q12: |
what causes friction? |
bhaumik |
11/10/2008 |
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| Q13: |
the changes that take place in the steam generator vessel as the waer is heated from a liquid to gas, increasd in pressure by increasing temperature and then cools back to liquid |
camella |
7/10/2008 |
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| Q14: |
Does KE and PE of a water molecule increase or decrease during 1) evaporation and 2) boiling? |
hobbs |
26/9/2008 |
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| Q15: |
explain Evaporation usin the kinetic theory |
shanice |
9/9/2008 |
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| Q16: |
Why steam is more injurious than hot water |
Ammad Zafar |
18/5/2008 |
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Water converts to steam at 540 calories for one gram of water, to raise the temperature of one gram of water from 37ºC (temperature of skin) to 100ºC (the boiling point) requires 63 calories (one calorie per degree). Hence to there is 9 times energy required to convert water to steam, this energy is stored in steam and it is released when the steam condenses to water and the water cools to the temperature of skin. The water molecules quickly condenses onto your skin into liquid form after transferring its energy thru exothermic reaction, or a heat producing reaction causing a burn, hence steam is more injurious than hot water |
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| Q17: |
use the kinetic theory of matter to explain why melting requires energy but there is no change in temperature |
fia |
28/4/2008 |
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| Q18: |
why water cools in a porous pot. the explaination that i got some where in my childhood is that water looses its K.E. when they collide with porous walls of d pot. but does it loose K.E. only when the wall is porous? |
sunil |
21/4/2008 |
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What is happening is as water is evaporating through the walls, it is taking the heat away from the rest of water molecules inside the pot, a black colored pot absorbs more heat and helps in evaporation through its walls. The KE of water molecules that escape to the atmosphere increases till they can break the bonds in the process they collide more with molecules and increase in speed, thus actually taking more heat away. Porous walls only provide an outlet, in absence of which, the water molecules will keep on switching between evaporation and condensation inside the pot. |
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| Q19: |
using kinetic theory of matter describe the phenomenon whereby liquid water can change to vapour (gas) and to Solid (ice) |
Onyenze |
25/2/2008 |
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Kinetic energy and the molecules can bring about the phase change. In liquid water, molecules are close but several groups of moles are clumped together and moving briskly, take out kinetic energy rapidly from the molecules, they slow down and subsequently nearly stop, this increases the force of attraction between them, causing bonds to form and results into a solid (ice). The reverse happens when the kinetic energy is increased in liquid water, the groups move faster and faster till they break the bonds apart and convert into individual molecules and form a gas. |
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| Q20: |
how is plasma also related? |
mimi |
1/2/2008 |
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Plasma is an ionized gas but not a gas. Plasma is considered to be a distinct state of matter, apart from gases, because of its unique properties. It has one or more free electrons, which are not bound to an atom or molecule. The free electric charges make the plasma electrically conductive. It is closely related to the gas phase in that it also has no definite form or volume, however in gas, all gas particles behave in a similar way, influenced by gravity, and collisions with one another but in plasma, electrons, ions, and neutrals can be distinguished by the sign of their charge so that they behave independently in many circumstances, with different velocities and temperatures, allowing phenomena such as new types of waves and instabilities. This makes it a fourth state of matter. |
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| Q21: |
why does the pressureof the gauge reading remains constant when the tank is shut off and there is no leak |
kristine |
27/1/2008 |
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If there is no leak the pressure will remain constant, what is the doubt here? |
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| Q22: |
why is it not advisable to increase the air pressure in a car tire to full limit when driving on a hot day? |
kristine |
27/1/2008 |
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Air being a gas undergoes expansion as the temperature increases. Heat of the day added to the heat generated due to friction of tires on the road couples to produce high temperature as the air expands it can blow up the tube, causing accidents. |
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| Q23: |
in the atmosphere, how can hot air be separated from the cold air and why is this so? |
kristine |
27/1/2008 |
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Cold air is denser and heavier than hot air. A hot air has more kinetic energy which allows it to act against gravity also being less dense makes the atoms take up more space and therefore makes it less dense and lighter, hence it rises up, while colder air due to higher density and lower KE falls. |
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| Q24: |
which one will cause severe burn 1g of water at 100 degree C or 1g of steam at 100 degree C |
Abdul Zaman |
14/1/2008 |
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Steam burns do have to potential to cause more damage than scalding. The reason has to do with the latent heat of vaporization. To convert 1 gram of water to steam requires about 540 calories ( latent heat of vaporization needed to break bonds) . The energy in the steam is 9-fold greater than the energy in the 1 gram of water at the boiling point (100 degree Celsius). This energy (as heat) is released when the steam condenses to water on the skin and the water cools to the temperature of skin. Steam will be substantially more injurious. |
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| Q25: |
what is meant by brownian movements? |
zulkifel |
13/8/2007 |
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Brownian motion is a wobbly and irregular thermal molecular motion in the fluid ( liquid or gaseous) environment caused due to inter-molecular collision and molecule-container wall collisions. It is observed as an irregular thermal agitation movement of particles suspended in a fluid. Brownian motion increases as size of particle decreases and temperature increases. This lead to the development of kinetic theory where molecules had random motion |
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| Q26: |
how does osmosis affect the kinetic theory of matter |
angela |
3/4/2007 |
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Macroscopically - osmosis is the rise of water separated by membrane in a u-tube in the portion in which solute is added. Kinetic theory explains this at microscopic level or molecular behavior of water when a solute is added – more in terms of hydration cells formation, which pulls water through membrane, another kinetic theory is based on osmotic pressure due to collision of water molecules. This is in contrast to popular diffusion theory based on concentration gradient of water. |
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| Q27: |
what is the differnce between boiling and evapourating |
elena katumba |
13/3/2007 |
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Evaporation is primarily a surface phenomenon. It takes place at all temperatures – molecules at the surface of a liquid receive enough kinetic energy to break free from attraction of other molecules and escape while boiling takes place only at a specific temperature. It takes place all over the liquid, all the liquid molecules attain the boiling point and they escape from all depths of a liquid. |
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| Q28: |
how can gas be turned into a solid? |
Jerry |
20/2/2007 |
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The difference between phases is kinetic energy of molecules; take out energy rapidly from the molecules the phase transition of vapour (or gas) to solid called deposition occurs, due to increased intermolecular attractions. Temperature has to be below freezing point for physical vapor deposition (PVD. At -78°C carbon dioxide becomes a solid called dry ice. At frost point, ice forms on a solid surface, this is a solid deposition of water vapor. This is how snow forms in clouds. |
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| Q29: |
what makes the rain come down frrom teh sky? |
Heather Ziegler |
28/11/2006 |
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Gravity |
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| Q30: |
What is the pressure of gas |
Sebastian |
17/10/2006 |
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At macro level Pressure is force per unit area it acts in all directions at a point inside a gas. At the surface of a gas, there is a pressure force (equal to the pressure (force/area) times the surface area in a direction perpendicular to the surface), a vector quantity that acts perpendicular to the surface. At micro level – it is collisions of molecules with the walls and surfaces of container that denote pressure. |
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| Q31: |
can you give a simple experiment that can be used to test the ideas of the kinetic theory of matter |
Mone Palya |
8/3/2006 |
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Take a cup of ice, another of hot coffee and in a third cup mix some ice and hot coffee, put lab. Thermometers in each and take temperature readings. In the mixture, the temperature comes down faster. Explain on basis of the H2O molecules in ice take energy from H2O molecules of coffee, break bonds, and melt. Those in coffee give up energy and cool down, until equilibrium. Unmixed hot coffee cools down slower. We are uploading an animation on this soon. |
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