Calculating Percentage by Mass

NEW AND IMPROVED
A fully resourced lesson for GCSE AQA chemistry on calculating percentage by mass.
Suitable and applicable for GCSE Chemistry Trilogy, and Combined Science Higher and Foundation.

Lesson Objectives

• Recall how to calculate relative formula mass using a periodic table
• Find the total mass of an element in a compound
• Calculate the percentage by mass of an element in a substance using relative formula mass and atomic mass
• Give answers to a specified number of significant figures

Lesson features

• Introduction slides to assess students prior knowledge and understanding of percentages
• Worked scaffolded examples (I do, we do, you do) for percentage by mass calculations and increasing difficulty
• Assessment for learning opportunities throughout
• Student-led practice calculation tasks (aimed both at Grade 5 and Grade 7+ candidates)
• Full answers integrated into powerpoint slides for all activities
• Stretch and Challenge Tasks throughout
• Past exam questions for separate science and combined science papers with full mark schemes and examiners reports (where available)

Lesson includes:

• Lesson powerpoint (.pptx)
• Separate science past exam questions with mark scheme and examiners reports
• Combined science past exam questions with mark scheme and examiners reports