English National Curriculum - Science

Investigating the effect of concentration

Mission Objectives

Describe how changing concentration affects the rate of reaction

Explain how increasing concentration increases the rate of reaction

Investigate the effect of increasing concentration on reaction rate

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Keywords

Words and meanings to learn

concentration

the amount of a substance (reactant) in a certain volume of solution

activation energy

the minimum amount of energy that particles need to successfully react when they collide

collisions

when particles bump into each other; for a reaction to happen, the collisions must have enough energy, called successful collisions

rate of reaction

how quickly a reaction takes place; it can be measured by how fast reactants are used up or how quickly products are formed

variable

something that can change in an experiment; it could be something you change on purpose (independent variable), something you measure (dependent variable), or something you keep the same (control variable)

This lesson has been written by

Samantha Batch

Samantha is a dedicated and accomplished science educator with over 15 years of leadership experience in the field, coupled with a strong background in scientific analysis. She has a proven track record of strategically managing educational departments, driving operational efficiencies, and nurturing collaborative relationships with stakeholders. 

Samantha previously served as the Head of Chemistry and Sixth Form Tutor, Ilkley Grammar School, Ilkley with extensive Key Stage 4 and 5 teaching experience and leadership. In addition to her teaching and leadership roles, she is also an examiner for AQA, providing her with valuable insight into assessment standards and exam specifications.

In her spare time, Samantha enjoys playing the accordion with her local orchestra and has recently taken up cricket, where she's enthusiastically honing her skills both on and off the pitch!

Required Resources

RP 1: 

  • Conical flask (100 cm3)
  • Single-holed rubber bung and delivery tube
  • Trough or plastic washing-up bowl
  • Two measuring cylinders (100 cm3)
  • Clamp stand, boss and clamp
  • Stop clock
  • Magnesium ribbon cut into 3 cm lengths
  • Dilute hydrochloric acid (2.0M and 1.0M)

RP2: Disappearing X with sodium thiosulfate

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