which two elements combine to form water?what proportion?
928534
You are asked two questions and you need two answers:\n\n1) The chemical formula for water is H2O which shows that the two elements needed to combine are Hydrogen and Oxygen.\n\n2) The proportion of the two elements needed, is also shown by the formula. This is 2 /1 Hydrogen / Oxygen by volume, or 2 /16 by weight.
195964
Water is one of those elements that was here from the start.  Some say it was created by God, some say it was part of some cosmic big bang that started everything.  Either way, it's formed by oxygen and hydrogen forming molecules.  One of oxygen and two of Hydrogen.  You can separate them by putting wires on a flashlight battery and sticking the wires in water.  One wire will generate oxygen bubbles, the other will generate hydrogen bubbles.  With enough hydrogen, you could make your own Hindenburg disaster.
25148
Carbon combines with oxygen to form carbon dioxide and carbon monoxide. Carbon combines with water and oxygen to form carbohydrates. It does this because there is an energy advantage to do this; the end state is a lower energy state than the initial state.
701551
No. It is a chemical compound. All rain water is a compound of two elements hydrogen and oxygen. The chemical formula for water is h2o - meaning two hydrogen atoms and one oxygen. Usually when rain becomes acid it has sulfur dioxide (another compound formed of sulfur and oxygen) and nitrogen oxide (yet another compound formed from the combination of the elements nitrogen and oxygen as well). These chemicals combine with the water to form sulphuric acid and nitric acid.
982375
Hydrogen and oxygen, when combined in an appropriate mixture, will burn to form water.  By itself neither pure hydrogen nor pure oxygen will burn (they need an oxidizer and a reductant respectively).  Water is a stable chemical component that does not have the volatile characteristics of the elements that make up its composition (hydrogen and oxygen).
613273
Excess of CO2 along with water forms carbonic acid. the reaction goes this way.\n\nCO2+H2O-H2CO3
850750
The two hydrogen atoms' single electrons fill the outer shell of the oxygen atom... this makes water (mostly) chemically inert.  Since combustion is simply rapid oxidation... it could be argued that the hydrogen is already oxidized... making water...\n\nElectrolysis can seperate the hydrogen and oxygen... but this is not combustion.
1030414
Water. As a liquid it sculpts the landscape, sustains life, and dissolves most other substances. As a solid, it expands to a state less dense than as a liquid, can support immense amounts of pressure (trucks above the Arctic Circle drive on ice roads), and can rip through steel hulled ships. As a gas, it provides a remarkable stable compound of the volatile Hydrogen and combustible Oxygen which allows it to drive out weather system. \nAlso, water acts as both an ionic and molecular compound, as if that weren't enough already.
1080141
"what element(s) and what bond(s) make water a universal solvent?"
789547
first you need to balance the equation\n\nC3H8(g) + O2(g) -------> CO2(g) + H2O(l) (unbalanced)\n\nCompare carbon atoms on both and you will make three CO2 for every one C3H8.  That leaves 8 Hydrogen atoms to make water which has 2 hydrogen atoms per molecule so you would need  4 H2O to balance that out. The equations starts to look balanced like this\n\nC3H8(g) + O2(g) -------> 3CO2(g) + 4H2O(l) (unbalanced)\n\nnow we have to figure out how much oxygen is needed to balance the whole thing.  There are 2 Oxygens in CO2 and 1 in H2O so we have a total of (3x2)+(4x1)=10 oxygen on the right side of the equation. since O2 has 2 oxygen we need 5 of them to get 10 so the equation looks like this.\n\nC3H8(g) + 5O2(g) -------> 3CO2(g) + 4H2O(l) (balanced)\n\nsince oxygen has an atomic mass of 16.000 amu then O2 has a mass of twice that or 32.000 amu=32g/mol\n\nfrom our equation we get that there is 1 mole of C3H8 to every 5 moles of O2. \n\n5molx32g/mol=160g
643847
1. Sodium will combine with Iodine, but Iodine never has a -3 charge. That would involving adding electrons to the 6st orbital, which would be considerably less stable than adding 1 electron to fill the 5p orbitals.\n\nSodium also doesn't form a +2 charge.\n\nBased on your data, it would be:\n\n3Na^+2 + 2I^-3 = Na3I2 \n\nI think it's:\n\nNa+ + I- ---> NaI or 2Na + I2 (solid) ---> 2NaI \n\nionic\n\n\n2. Protons will activately react with hydride donors to give hydrogen gas. That's why Lithium aluminium hydride is so reactive to water ... it considers the water's hydrogen atoms as a source for protons.\n\nH+ + H-1 ---> H2   covalent and non-polar.\n\n3.\nC^+4 + 20^-2 ---> CO2\n\nCovalent and non-polar
570980
If an element combines with another element to form more than one compound, the various weights of one compound which combine with the fixed weight of the other element bear a simple ratio to one another eg\nCarbon Monoxide C 12  + O 16\ncarbon Dioxide  C 12  + O 32\nRatio of 1 to 2
258479
Water is H2O. Two hydrogen and one oxygen. Water is the universal solvent because it mixes well with most substances. Water is the most common and mysterious substances on earth. Water is suppose to be a gas ,but it's a liquid at room temperature. Water has a negative side (oxygen) and a positive side (hydrogen). This is another reason why water is the universal solvent it can dissolve just about any solute because the H and O are at 102o angel which means it can pick up most solutes. 97% of the earth's water is salt water will only less than 3% is drinkable. 70% of the earth's animals live in salt water. All animals need water.
802199
Hi,, hydrogen, oxygen, and nitrogen... \n\n good luck.....
631873
i dont know what is too difficult inthe question to understand it!!\nok to find out the formula of a binary compound whatu need to know essentially is the valency exhibited by an element in that compound\nlet us take water: constituted by hydrogen and oxygen\nvalency exhibited by hydrogen is always 1, and that exhibited by oxygen is 2\nthis implies that two atoms of hydrogen combine with one atom of oxygen and hence the formula of water is H2O
571042
if you combine it like that you won't get nothing. if u combine one molecule of oxygen, O2, and two of hydrogen, H2, than you'll get water, if you combine one O and one H you'll get an anion HO- , and in H2O2 it's a compound where the oxygen anion is O- and normally it's always O2-. at least that's the way i know it!
1120799
Fe + H2O2 --->\n\n4Fe + 3H2O2 --->2Fe2O3 + 3H2\n\nRust forms and hydrogen is the gas that evolves.