51ºÚÁÏ

Calculating the molecular formula from the empirical formula and ideal gas equation calculations full lesson with questions and answers. A level and GCSE chemistry suitable. All the slides in this lesson are fully animated and include answers to every mini plenary question and exam question. The breakdown of the slides is as follows:

Slide 1 - Title and 5-minute starter. The starter is a grid of four questions entitled ‘last week, last lesson, today’s learning and future learning’. Use this generic slide for all of your lessons by simply changing the questions and the answers each time.
Slide 2 - Lesson objectives (see thumbnail image)
Slide 3 – Recap of molecular formula to empirical formula to review prior learning
Slide 4 – Definition of molecular formula with an example
Slides 5 -6 Introduction and exposition of terms relative molecular mass, relative formula mass and molar mass
Slides 7 – 9: Worked example 1 - The empirical formula of a compound of boron and hydrogen is BH3. Its relative formula mass is 27.7. Determine the molecular formula of the compound. Live model to show students how to solve. Answers are in the notes sections.
Slides 10 -12: Worked example 2 (harder)
Slide 13 – Mini plenary question: Vitamin C (ascorbic acid) contains 40.92 % C, 4.58 % H, and 54.50 % O, by mass. The experimentally determined molecular mass is 176. What are the empirical and chemical formulae for ascorbic acid?
Slide 14 – Introduction to ideal gas equations
Slides 15 – 16 – Printable version of the equation
Slide 17 – difference between ideal gas and real gas
Slide 18 - conversion of units slide (very important for ideal gas equation calculations)
Slide 19 – 20 Printable version of conversion slide
Slides 21 – 22: Worked example (ideal gas calculation to find the molar mass
Slides 23 – 28: Mini plenary with 3 part question, where students must find the empirical formula, the relative molecular mass and finally the molecular formula of two substances. Answers animate onto the screen as you click (as always)

If you have a positive experience with the resource please leave a positive review! This really helps promote my store!