Chemistry 12 Name __ [ Kr;,/ J---Chemistry 12

Worksheet 1.1 - Reaction Rate Calculations

1. A chemist wishes to determine the rate of reaction of zinc with hydrochloric acid. The equation forthe reaction is:

Zn(s) + 2HO(aq) -f H2(g) + ZnC12(aq)

A piece of zinc is dropped into 1.00 L of 0.100 MHCI and the following data were obtained:

T· ( )() f . (\j )une Mass 0 ZmcOs 0.016 g4 S 0.014 g8 S 0.012 g

12 s 0.010 g16 s 0.008 g20 s 0.006 g

a) Calculate the Rate of Reaction in grams of Zn consumed per second

~ail:::. /J. rvtaSj :: 0.00" - O. oj h 9 - - O·0 109 = - O. 0005D ~b-H m-L :;2-0 oS - D S I)...f) .s S

Answer O. DOO 60 IJ/~b) Calculate the Rate of Reaction in moles of Zn consumed per second

Ra.\e::. O. oooSOj z.o. xs Answer /. ~5 y../D

bmol_S

c) Write out the complete ionic equation for the reaction.of - I , ~-+2n ($) + ;l, H- CA.1) l' :l C I <:.41') -7 n.t{g) + Zn 1"1} ;( CI L~)

d) What will happen to the [W] as the reaction proceeds? Ctt +.] WI' J J d..( GY-Utt S..e.

e) What will happen to the [Cn as the reaction proceeds? nO c--h- CLvtuL

( sp-a.+-ttttJ r: /0 h J

Chemistry 12 Name __ []({~ ~ J--2. When magnesium is reacted with dilute hydrochloric acid (Hel), a reaction occurs in which hydrogen

gas and magnesium chloride is formed.

Here is the balanced reaction:

Mg(s) + 2 HCI(aq) ~ H2(g) + MgCh (aq)

1 ~ J--... J ~ J

a) If the rate of consumption of magnesium is 5.0 x 10-9 molls, find the rate ojconsumption of Hel in moles/so

-~::::. J;:};..;=e I - 0 x 10 m()I l-kl

S-?

Answer I· 0 'i.. J () f'IA (> , / S

b) If the rate of consumption of magnesium is 5.0 x 10-9 molls, find the rate of production

OfH2ingis. fVlol£ ratiD is I m{)J H-,j = I Mol 1-12-/.'" -"9 .tI rYloV1tz... 'j. .!" . 0 f) -=- J. 0 ](Ii) <3 rJ2-

I~~ ImyvH~ ~--<i*- mi)l or" m» s s CJ{. I-I~: ~ 0 bt / Answer /.0 X 10 &' I

, .J/fl'lb I ISc) If the rate of consumption of magnesium is 5.0 x 10-9 molls, find the rate of production

OfH2 in Lis (@STP). f<~ J me I 8 (J Sf :;; a 'J. 4- L @ s-re.K.ak:: S"". D j.' 0- ~ ~ t;{ )( J rvtt)~ >'

~ I~

Ra J-G =- ~. 0 y.. ID- CJ rYlO ~ x.

s

~ --=1- IAnswer ,. I •. .,....JO ~ / S

(2. S'J .p,~~) Id) If the rate of consumption of magnesium is 5.0 x 10-9 molls, find the mass of Mg

consumed in 5.0 minutes. c: 0 .o . m,(l:::'

/"rlr>tp,s 4- fij ton~u~ = f(ak.. )( n'(lI1G

::: ~. 0 y.. ID -1 fYlO J '}.. 3 0 0 S

s

300 OS •

-fa;:!.. I, 5 'j.. J D MO I