----- i realy don't know how to answer these ques because i was away for whole week and my teacher give me this thing!
a. what are the two reagents used in this reaction?
isn't it mg and hcl
b. what are the two products of this reaction?
so...it's hydrogen and mg chlo...right?
c.what three pieces of evidence might tell usthat a chemical reaction occurred?
--i have no idea
2006-08-16 23:16:17 · 8 answers · asked by paparuscy_s 1 in Science & Mathematics ➔ Chemistry
you have answered a and b right, for question c,
1, it's an exothermic reaction, so the contents will heat up
2 hydrogen is produced so you should see bubbles
3 the weight of contents after and during reaction should decrease since the hydrogen atoms are escaping
2006-08-16 23:25:21 · answer #1 · answered by lippy19850528 3 · 1⤊ 0⤋
Okay you need help for part c - actually there are many things that goes on, but here's what I can do to help:
(1) Hydrogen is being generated, so you'd see bubbling that would indicate to you something is going on when you mixed Magnesium with HCl
(2) Magnesium is metallic looking, but upon reaction it become MgCl which is water soluble, so you'd also see the Magnesium disappearing. You may see some MgCl crystals which are colourless or whitish - which would still look different from Magnesium anyways - so I'd go with the dissapearance of Magnesium as the other indicator.
(3) The acid HCl is also being depleted, as such the pH of the mixture will also be changing, if you monitor that it would also indicate something is going on.
Hope it helps.
2006-08-16 23:33:03 · answer #2 · answered by unstable 3 · 1⤊ 0⤋
hey this is cool...i just learnt it in school today
metal + acid= hydrogen + salt
so, Mg + HCl= Hydrogen + Magnesium Chloride
and how can you know the evidence when you gotta do an experiment for it???
there should be an exothermic reaction that means there is heat and if there is bubbles as there is hydrogen and that is the answer for question c.
anyways
all the answers are correct
2006-08-16 23:33:28 · answer #3 · answered by Anonymous · 0⤊ 0⤋
The Why is it no longer a possibility to get good magnesium back from a HCL/Mg (plus water) reaction after the Magnesium is dissolved in the answer? Mg + HOH ? Mg(OH)2 + H2 Fe + Cu(NO3)2 ? Cu + Fe(NO3)2 A nail in copper sulfate will be plated with copper in a jiffy you should use electricity to opposite this reaction and eliminate the copper from the nail. that's executed in an aqueous answer(water) right that's an excerpt from Wikipedia The loose component (metal) isn't got here across evidently in the international, because it truly is fairly reactive (inspite of the undeniable fact that once produced, is lined in a skinny layer of oxide, MgO. even as it truly is submerged in water, hydrogen bubbles will merely about unnoticeably start up to style on the exterior of the metal, inspite of the undeniable fact that if powdered it is going to react a lot more effective right now. The reaction will happen speedier with more effective temperatures both the reactions above are unmarried alternative reactions. the style is Mg is so reactive. that in case you used electricity to opposite the Mg + HOH reaction in an aqueous it would want to react the water and style Mg(OH)2 and bubbles of H2 gas, so that you're back the position you began. in case you need me to respond to your questions in the destiny, request that I be one in all of your contacts. Then once you post a question, i visit acquire it by skill of digital mail. in the different case I merely search for randomly for a question to respond to. thanks for the danger to be of help
2016-11-25 22:11:01 · answer #4 · answered by ? 4 · 0⤊ 0⤋
Well almost...
The problem is HCl must be disolved in water for the reaction to work. MgCl (a salt) will precipitate out and H2 will be liberated.
Your reagents are Mg and HCl.. your products will be MgCl and H2.
You may or may not see Mg Cl precipitate out. Since Mg is a solid, you'll see it disolve. If you're good you'll have collected the H2, and the Ph of your solution will increase.
2006-08-16 23:26:13 · answer #5 · answered by Wicked Mickey 4 · 1⤊ 0⤋
a) A clean magnesium ribbon, dilute hydrogen chloride.
b) Hydrogen gas and magnesium chloride.
c) The shiny magnesium ribbon is no longer there, a white powder is formed and a colourless, odourless gas that 'pops' when a glowing wooden splinter is brought close to it.
2006-08-16 23:46:24 · answer #6 · answered by Veefessional 2 · 0⤊ 0⤋
I know the first two answer u have are right.
I don't know about the 3rd one either, it's been over 2 years since i took chemistry.
2006-08-16 23:25:39 · answer #7 · answered by Chad O 3 · 1⤊ 0⤋
a. mg and hcl
b. h2 and mgcl2
c. metal disappeares and a flameble air comes out
2006-08-17 04:48:17 · answer #8 · answered by chaveen 2 · 0⤊ 0⤋