Year 7 Science · Unit 4 · Lesson 6
Master Worksheet
Learning Goals
Read the line graph
This line graph shows the temperature of a cup of hot cordial measured every 5 minutes as it cooled on a bench. Use it to answer the questions below.
(a) What was the temperature at 0 minutes, and at 10 minutes?
(b) Describe the trend, and explain what is happening to the cordial.
Plan an investigation
Scenario
A classmate claims that "the warmer the water, the faster a teaspoon of sugar dissolves in it." This is a claim that science can test. Your job is to plan a fair, controlled investigation, then design a results table ready to fill in. Remember a fair test changes only one thing at a time and keeps everything else the same.
(a) Name the independent variable, the dependent variable, and two controlled variables for this investigation.
(b) Design a blank results table for this investigation. Give each column a clear heading with its correct unit, and include enough rows for at least four different water temperatures.
| Column 1 heading and unit | Column 2 heading and unit |
|---|---|
(c) Predict the trend you expect on a line graph of your results, then explain how you would use the graph to write a conclusion that answers the question.
(d) Evaluate this statement: "Measuring the dissolving time only once at each temperature is enough to be sure of the trend." Do you agree? Justify your answer.
Wrap Up
In one sentence, what was the main idea of this lesson?