2006-08-10 20:25:43 · 9 answers · asked by kat 2 in Science & Mathematics ➔ Chemistry
a totally new substance with properties very different from the reacting substances is formed
2006-08-11 01:13:04 · answer #1 · answered by raj 7 · 0⤊ 0⤋
chemical reaction occurs when two or more chemical substances are mixed together and change into new substances. For this to happen, the bonds between atoms and molecules must break up and then re-form in different ways. Because the bonds can be strong, energy, (usually in the form of heat), is often needed to start a reaction. The new substances (products) have different properties from those of the original substances (reactants)
2006-08-10 20:32:52 · answer #2 · answered by j@mE$ 6 · 0⤊ 0⤋
If atoms do not substitute throughout a chemical substitute reaction, then what do they do ? Atoms would becpme ions with the help of attracting electrons or freeing electrons. In some chemical reactions, an atom would attraction to an electron from a a lot less electronegative atom. There are 4 straightforward sorts of chemical reactions. Synthesis 2 Na + Cl2 ? 2 NaCl In NaCl, Na is a +a million ion and Cl is a -a million ion. 2 Na ? 2 Na+a million + 2 electrons Cl2 + 2 electrons ? 2 Cl-a million Decomposition CaCO3 + warmth ? CaO + CO2 as a effect, the cost of each atom remains consistent, besides the undeniable fact that the atoms are prepared in yet in a special way. Mg(OH)2 + warmth ? MgO + H2O unmarried alternative 2 Fe + 6 HCl ? 2 FeCl3 + 3 H2 2 Fe ? 2 Fe+2 + 6 e-a million 6 H+a million + 6 e-a million ? 3 H2 as a effect, the cost of each atom, Fe and H, differences, and the atoms are prepared in yet in a special way. Double alternative 2 FeCl3 + 6 NaOH ? 6 NaCl + 2 Fe(OH)3 as a effect, the cost of each atom, Fe+3, Cl-a million, Na+a million, and OH-a million remains consistent, and the atoms are prepared in yet in a special way. In nuclear reactions, the fashion of protons differences, so the atom will change into an atom of a distinct element!
2016-11-24 19:44:35 · answer #3 · answered by ? 4 · 0⤊ 0⤋
depends on what are the substances used for the chemical change in the first place. usually the substance produced does not has properties of its constituent substances.
2006-08-10 20:42:42 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Chemical changes always involve formation of a new substence: compund or an element.
And no it doesnt have to be "...two or more substances...".
It can be one substance breaking down to form two or more new substances. For instance in decomposition of hydrogen peroxide there is the formation of water and oxygen.
2006-08-10 20:42:15 · answer #5 · answered by Anonymous · 0⤊ 0⤋
depends on the original chemical. it could yield vapor, plasma, etc. If you mean, what other substance yields, like the fusion of hydrogen+oxygen=water, that varies from element to element, or substance to substance.
2006-08-10 20:34:17 · answer #6 · answered by Anonymous · 0⤊ 0⤋
gases or liquid depending upon the chemicals
2006-08-10 20:31:20 · answer #7 · answered by Explorer 5 · 0⤊ 0⤋
solid/liquid/gas depending on the reacting substances and their physical state, moles and other laboratory conditions...
2006-08-10 20:33:40 · answer #8 · answered by Meooww 2 · 0⤊ 0⤋
it depends on what chemicals you are mixing. you may form salts, precipitates, gas, or an aquaous solution.
2006-08-10 22:07:11 · answer #9 · answered by ma_jo26 1 · 0⤊ 0⤋