Download presentation

Presentation is loading. Please wait.

Published byJaylyn Murrill Modified over 3 years ago

1
Practice makes perfect

2
Balancing equations

3
Balancing equations strategy Write the equation unbalanced Look at the most complex substance and balance, remember to add co efficiency! Go through each element Make sure the coefficiencies are the lowest

4
For example This is balanced, but the coefficient is not the smallest whole number (divide by two) Most importantly CHECK YOUR ANSWER, by recounting the atoms

5
Moles & Masses Remember to look at the units (Kg vs. g)

6
Respiration C 6 H 12 O 6 +O 2 → CO 2 + H 2 0 Alkanes C 7 H 16 +O 2 → CO 2 + H 2 0 Thermite (demonstrate?) Fe 2 O 3 +2Al → Al 2 O 3 + 2Fe Balancing these equations...

7
Respiration C 6 H 12 O 6 +6O 2 → 6CO 2 + 6H 2 O Alkanes C 7 H 16 +11O 2 → 7CO 2 + 8H 2 O Thermite (demonstrate?) Fe 2 O 3 +2Al → Al 2 O 3 + 2Fe Balanced equations answers

8
Calculating the amount of atoms Calculate the amount of moles Multiply the number of moles by 6.02 x 10 23

9
Some examples..... How many atoms in a)78g of H 2 b)64g of methane (CH 4 ) c)41g of calcium nitrate (Ca(NO 3 ) 2 For How many atoms in a)78g of H 2 b)64g of methane (CH 4 ) c)41g of calcium nitrate (Ca(NO 3 ) 2

10
Working out reacting masses CIp8 Write a balanced equation Write the amount of moles of each substances Write the masses in grams Calculate for 1 gram of product Multiply for the mass given in the question

11
Exam practice 1.Each pair has one question 2.Answer it individually (5 mins) 3.Discuss your answers with your partner (4 mins) 4.Come up with a final answer Move to the next question on another desk

Similar presentations

OK

Mass Relationships in Chemical Reactions Chapter 3 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

Mass Relationships in Chemical Reactions Chapter 3 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on domain name system Convert free pdf to ppt online convert Ppt on synchronous reluctance motor construction Ppt on power line carrier communication pdf Ppt on ipad 2 Seminar ppt on cloud computing Ppt on porter's five forces model analysis Ppt on hydrogen fuel cell vehicles Ppt on hydroelectric plants in india Ppt on different solid figures worksheets