Year 10 Science · Unit 2 · Lesson 18

Investigating Reaction Rates

Challenge Worksheet

Name

Date

Class

Learning Goals

Design a complete, valid investigation into HCl concentration and marble chip reaction rate.
Write aim, hypothesis, variables, method, data table, graph type, and safety for a full practical plan.
Identify limitations of the experimental design and suggest improvements.

Go Deeper

Design a full investigation

A scientist wants to test: "Does the concentration of HCl affect the rate of reaction with marble chips (CaCO₃)?" Plan the investigation below using your knowledge from this lesson.

Aim (What are you investigating?)
Hypothesis (If… then… because…)
Independent variable
Dependent variable & how measured
Controlled variables (list 3)
Method (5 numbered steps)

Go Deeper (continued)

Data table (Design the table with column headings and rows for 5 HCl concentrations, 3 trials each)
Graph type & axes (What kind of graph? What goes on each axis?)
Safety precautions (2)
One limitation of this design
One improvement to address the limitation

Wrap Up

In one sentence, explain how collision theory predicts what will happen to the reaction rate when you increase the concentration of HCl.