What is Silica Gel?

What is Silica Gel? Silica gel is a granular, vitreous, porous form of silicon dioxide made synthetically from sodium silicate. Silica gel contains a nano-porous silica micro-structure, suspended inside a liquid. Most applications of silica gel require it to be dried, in which case it is called silica xerogel. For practical purposes, silica gel is often interchangeable with silica xerogel. Silica xerogel is tough and hard; it is […]

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Cleaning Coins

Cleaning Coins I looked at my coin collection, and I thought of something. Everyone said: “Just put them in vinegar” or “Cleaning them with soap is enough”. No. Those methods don’t work at all, my coins are still dirty. I’m going to need an experiment.     The first beaker has hydrochloric acid, the second has sodium hydroxide. I’m going to […]

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I Found the Answer

I Found the Answer Finally, I found what this is: I cracked one of the tiny stones and the inside was black: I guess the color has been covered by some other minerals or the color on the outside has been changed from weathering. Remember, the color of magnetite is always black. Also, I did the streak test. The “streak test” […]

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How to get rid of flies in your house

From Indianes Kitchen. Go visit the link on the bottom of this post. It will tell you how. Don’t you hate that time of the year when the Fruit Flies invade your kitchen? Landing on your food is disgusting! It seems like they are everywhere and you can’t get rid of them! You won’t get rid of them completely unless you throw out your ripe produce or put the ripe produce in the […] Visit the full post here: Fruit Fly Solution — In Dianes Kitchen

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Melting #2: Copper (II) Sulfate (Didn’t Work)

Melting #2: Copper (II) Sulfate (Didn’t Work) The last time we melted sulfur, and it was really fun (except for cleaning the test tube). Now let’s melt something else, what about Copper Sulfate? Copper (II) sulfate is the inorganic compound with the chemical formula CuSO4. Older names for this compound include blue vitriol, bluestone, vitriol of copper, and Roman vitriol. The pentahydrate (CuSO4·5H2O), the most commonly encountered salt, is bright blue. Melting Point: 110 °C (230 °F) Sulfur’s melting point is 5 °C higher (which means they’ll melt about the same time). It looks impossible to melt it because the sulfur is more (soft) like a powder, but this one is tiny crystals. Let’s give it a try anyway. Light the lamp! OK, it’s heating it up nicely. A couple minutes later: The copper sulfate is turning whiter, but still, all of it still remains solid. But look. There’s water vapor in there. That’s weird, maybe there’s too much heat? But the sulfate didn’t melt yet. 10 minutes later: The sulfur melted already at this time. But the sulfate still remains a solid and it’s just turning whiter. 20 minutes later: This is taking forever! It’s not melting. Did I do something wrong? It’s 115 °C already, and the temperature can go further. I guess it won’t melt anymore so I turned off the heat. Wow! this experiment is a fail. I wonder why it has water vapors? Why is it turning white? When is it actually going to turn to liquid? Any ideas why it didn’t […]

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