ok does the mass of a substance change when it undergoes a chemical reaction?
2006-09-23 16:38:30 · 7 answers · asked by amber k 2 in Education & Reference ➔ Homework Help
it depends on what kind of chemical reaction but it most cases...
NO!!i actually just studied that in science and did many labs that showed the mass does NOT change during a chemical reaction or change of state (gas, liquid, solid)
so as long as the substance is contained when it undergoes a chemical reaction, the mass stays the same.
2006-09-23 16:43:10 · answer #1 · answered by chuck 2 · 0⤊ 0⤋
The mass of all substances involved at the beginning of the reaction will equal the mass of all products at the end of the reaction. The problem will be with determining the mass of the gases involved as either initial substances or final products unless you have a closed system.
By definition, a chemical reaction involves a change of substances. The chemical formulas of what you start with will not be exactly the same as what you end with.
Melting ice or boiling water is a physical change since you have just changed the state in which the water is in but have not actually changed the chemical makeup of the water so that it is another substance. It is still H2O.
2006-09-23 23:50:19 · answer #2 · answered by Rockster 2 · 0⤊ 0⤋
No...there is a law that states that the mass before must equal the mass after.
If it's one substance though, then it could--like if water became gas, then you would have two different substances, but their mass would have to be the same.
2006-09-23 23:41:19 · answer #3 · answered by Kelly M 4 · 1⤊ 0⤋
No, the law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction but can be transformed
2006-09-23 23:40:39 · answer #4 · answered by busterbrown1030 1 · 1⤊ 0⤋
It can and it can't. If an ice cube is going through hot water, the mass will get smaller. If a rock is going through water, nothing will happen. yes, it will change.
2006-09-23 23:42:13 · answer #5 · answered by Brown Eyes 2 · 0⤊ 0⤋
Yes. the number of moles of a chemical, on the other hand, WILL NOT CHANGE. The number of moles of a chemical on one side of the equation have to equal to the other side of the equation.
2006-09-23 23:46:58 · answer #6 · answered by water is poison 2 · 0⤊ 0⤋
sometimes
2006-09-23 23:40:53 · answer #7 · answered by Anonymous · 0⤊ 0⤋