# Tag Info

4

First of all you need to understand how the rubber is held together in the first place. Rubber, plastics, carbon fibre and pretty much all forms of living tissue are held together in the same manner. All, or a large part of the molecules are long strings, either repeating the same simple pattern, or a number of slightly different patterns organised in random ...

1

Your Question is perfectly valid despite most people may think it's odd as reason looks obvious. There's a property of system called Entropy which must not decrease for any process (Do some research on web; You may have problem in understanding it as you're in High School). Only those processes in the universe happen in which Entropy of system either stays ...

2

The difference between solid and liquid lies in the atomic structure. Ice is crystalline (and therefore in an ordered state) while water has no such ordering. It is amorphous. So the reason for the abrupt change in state is that something cannot be ordered and unorderd at the same time. Now you may say "Hey, why not have some regions that are orderes and ...

0

Fill a bowl with water, let it stand for a few days and then see how much water is left. Water vaporizer all the time depending on the conditions. Boiling means that vapor bells are created everywhere through the liquid. Below boiling temperature the vaporization only occurs at the boundary surface with the air. According to John Rennie I might have ...

6

You are thinking of a lego or a jigsaw puzzle. You have to think of huge numbers and tiny dimensions . There are 10^23 molecules in a mole. The atomic dimensions are less than 10^-9 meters. The lattice that has been broken will not fit the puzzle if it has been moved further than this last small distance because the molecular forces will not match. In ...

2

You have broken the chemical bonds between the molecules by inserting energy which is then dissipated. You also distorted the molecule structure. To repair this you should again insert energy. Holding the pieces together does not provide the energy, nor reorders the molecule structure. The answer to your second question is this no.

1

Each mole of sucrose in a kilogram of water would depress the freezing point of water by 1.85 degrees C, according to Blagden's law (which is more valid at low concentrations). The molecular weight of sucrose is 342 grams/mole. So 2% sucrose should freeze around -0.1 C and 10% sucrose -0.5 C. Fractional freezing of grapes increases sugar concentration ...

3

Is tossing out ice that forms in the buckets overnight helping with that efficiency, or are we actually throwing out valuable sucrose that could be made into syrup. There's an easy way to test: take a sample of the discarded ice, melt it, measure the volume $V$, evaporate it until only solids remain, weigh the solids, and compute the percent dissolved ...

0

Any oil from your fingers that resides on the outside of the halogen lamp will absorb some of the heat and light from the filament in operation, and cause the fingerprint area to be hotter than other parts of the bulb. All it takes sometimes is a small differential in temperature for anything made of glass or quartz to develop a weak spot from the ...

1

From http://chemicals.etacude.com/z/zinc_chloride.php it would seem that the enthalpy of formation of zinc chloride is -415 kJ/mol. It has a melting point of 290C and a boiling point of 732C. Since it seems happy to boil (and make a smoke screen), you would need to go above (given the formation energy well above) 732C to get it to dissociate by itself on a ...

1

A little bit of physics - but mostly just fashion. Red wines (supposedly) need to oxidize to release the flavo(u)r so red wine glasses have wider necks to allow more air. White wines don't and so the glasses have narrower necks. If there really was a significant difference then you would drink white wines from a sealed pouch through a straw and shake red ...

-1

My previous answer was less comprehensive that what Charles Beaudette have well detailed. this books is available (courtesy of the author) on the site of University of Tsinghua http://iccf9.global.tsinghua.edu.cn/lenr%20home%20page/acrobat/BeaudetteCexcessheat.pdf Unlike the books of Huizenga and Taubes, it contains references to works done after 1989, it ...

2

If we know wavelength and intensity of emission spectra for an element, isn't what we "see" as it burns simply a superposition of these? Yes. If I try to reconstruct the apparent color of copper from its spectrum as $\sum f_n \cdot i_n /\sum i_n$ in which $f_n$ and $i_n$ are the frequencies and relative intensities respectively, it seems to work. ...

0

Neon is not molecular, it is atomic. A gas discharge has negative resistance not ohmic resistance. If you do not have a ballast you will blow your power supply. Binding energy is negative. If you juice the plasma harder and harder, you will further ionize the atom and see more and more energetic parts of its emission spectra. The last step is a ...

0

Take your lump, hit it with an x-ray or e-beam. See how it fluoresces (and absorbs, for the x-rays), http://alloytester.com/XRF-alloy-analyzers-2?gclid=CPuJzaSF27wCFYRQ7AoduSgAHg From Mg to U, hand held. http://en.wikipedia.org/wiki/Extended_X-ray_absorption_fine_structure If you want structure as well as composition, it gets complicated. If you ...

2

So my question is actually twofold: how did people manage to discover them more than 100 years ago (historically), Historically there are many different ways people discovered different elements, and many ingenious ways of proving that they were actually elementary. One of the most useful and revolutionary was the discovery of Electrochemistry. Where ...

1

If I understand You correctly, by solvent You mean any liquid different than Your 'main' liquid. If so, it is pretty straightforward, since it is a simple mixture of two liquids. If the heat capacity of main fluid is defined as 'energy required to change the temperature of a mass unit of an object by 1 K', then the heat capacity of the mixture is mass ...

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