Question

WILL MEDAL AND FAN!!

3. Show your work on how you would calculate the % yield of hydrogen if 40.0 grams of magnesium react with an excess of nitric acid producing 1.70 grams of hydrogen gas. Mg + 2 HNO3 ---> Mg(NO3)2 + H2.

4. Predict the products in the reaction between magnesium and hydrochloric acid. If you were conducting this reaction in the lab, what would be your clue that this was a chemical reaction? If silver replaced magnesium as one of the reactants, what would you expect to happen?

Answer 1

Well, what is product of Mg and HCl

Answer 2

Also, did your teacher force you to memorize the metal reactivity sequence?

Answer 3

She didn't really teach us anything. It's an all on your own thing which doesn't help me at all.

Answer 4

-1000 for american education!

Answer 5

not univeristy though, cuz I am in US univ right now

Answer 6

I can do everything well in Chemistry except all this stuff :/

Answer 7

ok so when mg meets hcl, h2 forms

Answer 8

h2 is a gas and not soluble in water so the solution should bubble

Answer 9

thats your clue on reaction happened

Answer 10

@563blackghost I think AY refers to mass of product, not moles of product,

Answer 11

so metal reactivity series lists the reactivity of metal from highst to lowest, with H2 in the middle. so everything below h2 does not react with acid to form hydrogen gas since they are not reactive enough

Answer 12

http://antoine.frostburg.edu/chem/senese/101/redox/faq/activity-series.shtml see this for a detailed explanation

Answer 13

So the products formed is
Acid + Metal --> Salt + Hydrogen
2HCl + Mg --> MgCl2 + H2 ?

I'm trying to write all of this down and understand it so I apologize if I'm not responding lol

Answer 14

yes, that is ture

Answer 15

by the way these metals that react with acid are basic or alkaline. and most of them come from group 1 and 2, so thats why group 1 is alkaline metal and group 2 is alkaline earth metal

Answer 16

So then the clue that this was a chemical reaction was like you said, h2 being a gas and the solution will bubble?

and how about the last part of the question on #4?

Answer 17

As I said, metals that are strong enough to react with acid to form h2 are above h2 in the reactivity seires, and those not are below

Answer 18

Okie dokie, thank you. :)

Answer 19

you can also say it from a redox persepctive

Answer 20

we know OIL RIG, Oxidation Is Losing electrons, Reduction IS Gaining electrons

Answer 21

so we know hydrogen ion got reduced

Answer 22

picking up my food, brb

Answer 23

ok Im bakc

Answer 24

since h+ got reduced, Ag has to be the reducing agnet

Answer 25

but what the activity sereis actually tells us is the reducing power of that chemical

Answer 26

since low=weak, we know ag cannot reduce h+ to h2, so no reaction