In #2, the two F- ions are "donating" electron pairs to the Be atom in forming covalent bonds with Be. That makes F- a Lewis base and the Be atom a Lewis acid. In #1 there is a transfer of electrons from Ca to S in forming two ions. No covalent bonds are formed. Is t...
CH3 is not a molecule. It is a functional group in a molecule. It could also be an unstable anion or cation. The Lewis structure depends on what that CH3 represents.
The sand bath is not a primary source of heat. It must be heated by a flame or a hot plate. Does that give you any ideas on how to adjust its temperature and the reaction rate?
Calcium Carbonate, CaCO3, which can form from Ca^+2 and CO3^-2 ions. Bicarbonate ions, HCO3^-, change to CO3^-2 ions in sea-water since sea-water is basic.
The chemical equation is: 2Na(s) + 2H2O --> 2NaOH + H2 Divide the grams of Na by the atomic mass of Na to get the moles of Na. The number of moles of NaOH are equal to the number of moles of Na.
The formula equation is: Ca(OH)2 + 2HC2H3O2 --> Ca(HC2H3O2)2 + 2H2O HC2H3O2 and H2O are molecular substances and you do not break them up into ions. The ionic reaction is: Ca^+2(aq) + 2OH^-(aq) + 2HC2H3O2 --> Ca^+2(aq) + 2C2H3O2^-(aq) + 2 H2O Cancelling out the "spe...
4. Graphite is a good electrical conductor and does not react chemically with most electrolytes. 5. (a) Ionic solids have high melting points and many of them have high solubility in water. (b) Molecular solids have low melting points and many of them do not dissolve in water.
1 mole of K3PO4 contains 4 moles of ions: 3 moles K+ ions and 1 mole of PO4^-3 ions. Multiply the number of moles of the compound by 4 ions/mole.
A metal that reacts vigorously with water must belong to Groups I-A (alkalis) or II-A (alkaline earths). Not reacting with K+ and Ca^+2 is no help at all. Not many other species do, either. Besides, Ca+2(s) is pure nonsense. Reacting with Na+ is unlikely. Reaction with Co+2(aq...
From DrBob's and my answer, I hope you can see that a metal surface can be protected in two ways: 1. Coat the active metal with the less active metal. This works well if coating stays in place and does not allow oxidizing agents through it. Cu and Sn on iron fit that descr...