8/11/2019 Workseet

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Worksheet 4.3

Balancing chemical equations

NAME: CLASS:

INTRODUCTION

The law of conservation of mass states that Matter can be neither created nor destroyed; it can only

be changed from one form to another. For chemical equations, this means that there must be the

same number of each type of atom on both sides of a chemical equation.

alance the following equations by adding coefficients to the chemical formulas where needed. !dd

the missing states to each equation.

No.

1 "i#$%&'aq( ) !g*%+'aq(!g#$%&'s( ) "i*%+'aq(

2 *i'*%+(#'s( *i%'s( ) *% #' ( ) %#' (

3 's( ) %#' (&%-'s(

4 /0+/%%0'aq( ) 1#/%+'aq( /0+/%%1'aq( ) /%#' ( ) 0#%' (

5 !l' ( ) 02'g( !l2+'s( ) 0#' (

6 /30-#'g( ) %#' ( /%#' ( ) 0#%' (

7 /u' ( ) !g*%+'aq(/u'*%+(#'aq( ) !g' (

8

/u' ( ) %#' ( /u%' (

9 1r%+'s( 1r's( ) % #' (

10 /a' ( ) *#' (/a+*#' (

11 0/l'aq( ) 4n'%0(#'aq(4n/l#'aq( ) 0#%' (

12 /#0&'g( ) %#' ( 0#%' ( ) /%' ( ) /% #' (

13 /%#' ( ) a'%0(#'aq(a/%+'s( ) 0#%' (

14

5b' ( ) 0#%' ( 5b%0'aq( ) 0#' (

15 /60-&'g( ) %#' ( /%#' ( ) 0#%' (

For each of the following multiple7choice questions, select the correct response.

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Pearson Education Australia (a division of Pearson Australia Group Pty Ltd) 2008.This pae fro! the Chemistry"For use with the IB Diploma Programme SL Teachers Resource !ay #e reproduced for classroo! use.

8/11/2019 Workseet

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Worksheet 4.3

Balancing chemical equations

No. Question Answer

16 The following equation represents the reaction of copper withconcentrated nitric acid8

a/u's( ) b0*%+'aq(c/u'*%+(#'aq( ) d*%#'g( ) e0#%'l(

The set of coefficients that will balance this equation is8

A -, &, -, #, #

B +, 9, +, #, #

C +, 9, +, #, -

D -, &, -, #, -

17 2ron can react with water to produce iron o:ide and hydrogen

gas. The unbalanced equation is8

aFe's( ) b0#%'l(cFe+%&'s( ) d0#'g(

The set of coefficients that will balance this equation is8

A +, &, -, &

B +, -, -, -

C , &, #,

D +, &, -, -

18 a0#$'g( ) b$%#'g(c$'s( ) d0#%'g(

The coefficients that correctly balance this equation are8

A #, &, , +

B #, -, +, #

C -, -, #, #

D -, #, +, -

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