Q:I have always been curious about the Culligan man. Exactly why do people choose to put rock salt in their water? What is the purpose of it? The city water is already clean and has flouride in it.

Well, I learned something new today! I never heard of the Culligan Man or water softeners that need salt to function. The link below explains how they work. The problem with the water is not that it is not clean, but that it is hard which means it has a lot of calcium carbonate in it. This gets deposited in pipes and makes it hard to get a lather from soap and shampoo. The water softener takes the calcium carbonate out of the water using ion exchange beads, and the salt is used to wash the beads periodically. I suspect they use rock salt because it is unprocessed and so it's cheaper than purified salt.

Q:Help with chemistry please!! When the mineral dolomite (CaCO3?MgCO3) is heated, it gives off carbon dioxide and forms a mixture of a metal oxide and a metal carbonate. Which oxide is formed?1. MgO2. CaO2.3. CaCO4. Ca2O5. MgCO6. MgCO37. MgCO28. CaO9. MgO210.CaCO3

M(CO3)(s) ? Δ ? MO(s) + CO2(g) K p(CO2) “The temperature at which a dissociation pressure is 1 atm CO2 is MgCO3 540 °C; CaCO3 900 °C” [1] (The driving force is the larger lattice energy of MgO(3795) vs that of CaO(3414 kJ mol^-1) [2] because of the smaller Mg^2+ ion, but it would take a very good student to deduce this.) So MgO is formed first. [1] N. N. Greenwood, A. Earnshaw, Chemistry of the Elements 2nd ed. (1997) p 114. [2] 2013 CRC Handbook Section 12.26

Q:What is the name of 30 common minerals in rock?

quartz othloclase plagioclase olivine amphibole pyroxene pyrope muscovite biotite magnetite andalusite staurolite dolomite spinel pyrite beryl calcite apatite zoisite hornblende scapolite epidote sillimanite augite ilmanite kyanite graphite tourmaline chlorite albite

Q:I‘m doing an Earth project and cannot find the abundance of the mineral cinnabar or its chemical properties? HELP ME PLEASE!

No I don't, I travel through this world to serve only you. I pay no attention to others. And since your perfect i have nothing to annoy me. Ok Lets get real, No I don't do this and really I don't care if anyone does this to THEIR car. I am amused though why something like this seems to have gotten under your skin. Maybe you need to take a vacation. (In a sunny place)

Q:LMAO. the other CO2 was imported from Mars? [in response to phyzziks is funn]

A spokesman for the Royal Society, Britain's leading scientific academy, said: At present there is a small minority which is seeking to deliberately confuse the public on the causes of climate change. They are often misrepresenting the science, when the reality is that the evidence is getting stronger every day. We have reached a point where a failure to take action to reduce carbon dioxide and other greenhouse gas emissions would be irresponsible and dangerous.

Q:What is the best type of hockey stick wood or composite. the best brand, and the best one of that brand? In your opinion.

Vapor XXXX p92 or One95 p92 (Naslund). I have tried both the vapor XXXX is great for stick handling and wrist shots. The one95 has amazing power and your slapshots will be amazing. The Synergy elite from last year (not the se16 or whatever) is really nice with the Heatly curve

Q:which mineral scratches dolomite and is scratched by olivine?

Apatite: Hardness 5 Dolomite has a hardness of 3.5 to 4, while olivine has a hardness of 6.5. Apatite, or any other mineral with a hardness of 5 is what you are looking for

Q:What is the cheapest price you have seen for an 85 flex kovalchuk pattern? And where did you see it?Thanks for the help.

Do a google search and then go to shopping it will pull up the cheapest price.

Q:could i have some info on limestone for my geography homework?

I recommend you place the subject remember you have the homework on right into a seek engine and characteristic a glance. pedia is likewise a stable place to look for concepts. Then get down and do the artwork!

Q:To find the mass percent of dolomite [CaMg(CO3)2] in a soil sample, a geochemists titrates 12.86 g of soil with 33.56mL of 0.2516 M HCl. What is the mass percent of dolomite in the soil?PLEASE explain your answers so I can follow you! Thanks to all. All help is greatly appreciated.

There are essentially two reactions going on here Calcium carbonate with HCl and Magnesium Carbonate with HCl. Luckily both react in with the same stoichiometry So first let's see what the reactions are CaCO3 + 2HCl - CaCl2 + H2O + CO2 MgCO3 + 2HCl - MgCl2 + H2O + CO2 So for every 2 moles of HCl one mole of the carbonates is neutralised. Let's work out the number of moles of HCl use use the formula M n/V (concentration M, n number of moles, V volume in litres) 0.2516 ?/(33.56/1000) 0.2516 ?/0.03356 0.2516 * 0.03356 ? ? 0.0084 moles acid were used So looking back at the 2:1 ratio of moles you know now that this 0.0084 moles HCl neutralised 0.0042 moles of Dolomite (0.0084/2) Now work out the molecular mass of Dolomite: Ca 40.07 Mg 24.30 C 12 x 2 O 16 x 6 So molecular weight of dolomite is 184.37 g/mole You have 0.0042 moles so 184.37 * 0.0042 0.7743 g this is the amount in your sample So % wise you have 0.7743/12.86 x 100 6.02%