why does dry ice react with water

why does dry ice react with water

The Chemistry of Dry Ice Theres more than meets the eye when dry ice is added to water. Within a certain pressure and temperature range, solid carbon dioxide (dry ice) does not melt. Instead it sublimates or passes directly to the gas phase. blue is added to tap water, a blue-green results. ( picture to the left). When dry ice is added, a significant amount of carbon dioxide dissolves in water, creating carbonic acid. The indicator soon responds to the presence of H molecular structure changes so that its electron energy levels are no longer the same, altering its response to light. To make a long story short, it reflects different a color, as shown to the right and in the picture below. beaker. invisible? It is, but the carbon dioxide gas molecules are cold enough to cause the water in

 why does my computer reboot for no reason

why does my computer reboot for no reason

I've been experiencing some problems with my prebuilt gaming desktop randomly restarting for the past few months. No blue screen, no warning, just off and back on. While this happens, all internals remain powered on, right down to the LED lights inside the case. It seems to happen sporadically, I can go weeks without it happening, or I could have a day where it happens three times, but recently, it seems to be happening more frequently. It doesn't matter what I'm doing, because it has happened web browsing, gaming, and just staring at my desktop. I have done virus scans and disk scans, both showing no problems, but strangely, I have to manually turn McAfee back on every time. This leads me to believe it may be a software problem. I originally thought it was the power supply, so I replaced

 why does my foot fall asleep while running

why does my foot fall asleep while running

As a runner, you expect the occasional aches and pains like muscle soreness and blisters. But a foot that goes numb when youБre running is a strange sensation. You are undoubtedly used to the feeling of your foot Бfalling asleepБ when you sit cross-legged on the floor too long. But when that numbness and tingling develops while youБre running, you may be alarmed. Fear not: Foot numbness while running is not uncommon, and most of the time, itБs easily remedied. Foot numbness is most often caused by a compressed nerve. The nerves that cause sensation in your foot and ankle can get trapped between bones or soft tissue. Because the nerve is compressed, itБs unable to send the correct signals to your brain from your skin and soft tissue. Nerve compression can make your foot feel like itБs on

 why do zimbabweans migrate to south africa

why do zimbabweans migrate to south africa

Temporary labour migration to South Africa has long been a feature of and then society. A 2002 survey by the Southern African Migration Project show that almost 25% of adult Zimbabweans' parents or grandparents had worked in South Africa at some point in their lives. However, permanent emigration is a relatively new phenomenon. There have been two major waves of emigration from Zimbabwe. The first was that of who left the country soon after the ended the government; the second, still ongoing, was that of ethnic Zimbabweans beginning in the 1990s. In both cases, was again their primary destination. From 1994 onwards, the South African government displayed increasing hostility to immigration from the rest of Africa. However, this has not served to limit the number of immigrants; Zimbabwean

 why does my lower back and right leg hurt

why does my lower back and right leg hurt

Hello, I am a new member and am tring to post in the right spot (hopefully) I searched around for a while on here and read some articles and posts, but can't seem to find anyone with my particular symptoms (maybe because I am not looking in the right place so sorry if that is true). Here goes. I am a 30 year old female in relatively good health. I have a history of lower back pain that radiates down my right leg (through my butt). This has occurred off and on for several years, since I was approximately 17. Sometimes it is so bad I can't even put weight down on my leg, other times I am able to deal with it ok with advil and a heating pad at night. My job, which is in a casual pizza/sandwich shop seems to make it worse. Lots of standing in one spot, hunched over a counter, or if not doing

 why do people have different coloured hair

why do people have different coloured hair

People invest a great deal of time and money into the appearance of their hair. Although we know chemically why hair is colored the way it is, much remains to be learned about the genetics behind hair color. And the question of why humans exhibit the diversity of natural hair colors we see, from blond to black to brown to red, may hold keys to part of our evolutionary history. According to the geneticist Luigi L. Cavalli-Sforza, the variety of hair colors we see among people today may be the result of a force called sexual selection. Sexual selection is a force, like natural selection, that shapes evolutionary trajectories. But unlike natural selection, sexual selection focuses specifically on traits related to procuring mates. According to this theory, diversity in hair color may be the

 why do people have low self esteem

why do people have low self esteem

The chances are that you find life very difficult indeed. You may well have a number of failed relationships behind you. Perhaps you've had problems with anger, or jealousy that have caused a split with a partner. You may also have found that your working life has been extremely disappointing. But you can change things. Read the ' ' article and try the various strategies outlined there в especially the one about listing 50 things and writing these characteristics out on cards, and carrying them with you. If you do this в and some of the other suggested exercises в you should begin to see yourself in a new light. It will also help you to read the books listed at the end of the article. You might also want to consider counseling because you would almost certainly benefit from having it.

 why does laser light not spread out

why does laser light not spread out

This has nothing to do with any minimisation principle, be it Fermat's Principle as correctly mentioned by @ChrisMueller, or the principle of least action. As @Jim said above, laser beams come out collimated, meaning they come out pretty much parallel to each other. The reason for this is because light is produced by in an optical cavity with two parallel mirrors. The fact that the laser light is coherent (meaning that photons have a well defined phase relation between them) also helps in producing these collimated beams. This is not completely true, as laser beams are slightly divergent, an effect called. This is shown in the picture below. The narrowest point is called the beam waist: As a consequence, laser beams actually tend to diverge over big distances, but the effect is usually

 why does my life suck so bad

why does my life suck so bad

It never rains; it pours. Never a truer word said. It seems like bad luck comes in spurts, usually in a row of three in my experience. Is this the way life works, or do we simply attract more bad luck because we slip into a negative spiral? Is the law of attraction at play? Is it all about maintaining a positive mindset and creating an alternative perception of luck? To a degree, perhaps. But no one is immune to bad things happening in life. No one can avoid loss and upset. But sometimes it does feel like life is conspiring against us. Sometimes my life sucks, and I'm sure yours does sometimes, too. Just recently I experienced a huge loss. A financial one. An aspect of my business I had built up over 4 years was ripped away from under my feet in one cruel blow. Worst of all, the

 why do sunnis and shiites hate each other

why do sunnis and shiites hate each other

By Dr. Laina Farhat-Holzman ~ Whenever I do a public lecture, questions come up about the Shiites and Sunnis. People read about their mutual hatreds and daily assaults on each other in Iraq and elsewhere in the Muslim world, but really do not know how these groups differ and why they are so violent. All religions eventually fracture into competing sects with very different interpretations of their common faith. We are well acquainted with this process in the deadly Protestant-Catholic wars, and those of us old enough can remember when families forbade dating and marriage between these communities. Since emancipation of Jews from their long exile in Europe, Judaism too fractured into groups characterized by their observance of all aspects of Jewish law: Orthodox (most observant),

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