Lesson 10: Investigation Revision Notes
Lesson Objectives
By the end of this lesson, you should be able to:
Grade C: Recall what is meant by change, measure, and control variables.
Grade B: Record results in a table.
Grade A: Be able to draw a bar graph with help.
Dissolving Sugar Experiment
In this investigation, we look at how sugar dissolves in water at different temperatures.
Variables Explained Simply
Change Variable (What we change): We're changing the water's temperature to see if it makes sugar dissolve faster or slower.
Measure Variable (What we measure): We watch and measure how long (in seconds) it takes for the sugar to completely dissolve in the water.
Control Variables (What we keep the same): We make sure to use the same amount of water, the same number of sugar cubes, and stir at the same speed every time. This makes our test fair.
Method
Doing the Experiment
1.Predict: Think about what you think will happen before you start.
2. Experiment: Follow the steps of the experiment, changing the water temperature, measuring how long the sugar takes to dissolve, and keeping everything else the same.
3. Record: Write down your results in the table for each temperature.
Example results
Water Temperature | Time Taken for Sugar to Dissolve (seconds) | Mean Time (seconds) |
Cold (5°C) | 90, 95, 85 | 90 |
Warm (20°C) | 60, 55, 65 | 60 |
Hot (40°C) | 30, 35, 32 | 32 |
4. Graph: Use your results to draw a bar graph. This picture helps us understand our results better.
Explanation of the Table:
Water Temperature: This column lists the different temperatures of water we used in the experiment. We have 'Cold', 'Warm', and 'Hot' as our categories, which represent our change variable.
Time Taken for Sugar to Dissolve (seconds): Here, we write down how long (in seconds) it took for the sugar cubes to completely dissolve in water at each temperature. Each temperature has three trials to show variability and help us find an average.
Mean Time (seconds): The mean (average) time is calculated by adding the times from each trial and dividing by the number of trials (in this case, 3). This gives us an average time it took for the sugar to dissolve at each water temperature.
Making a Bar Graph
To make our bar graph, we draw a picture with bars going up. Each bar shows the average time it took for the sugar to dissolve at different temperatures. This helps us see which temperature makes sugar dissolve the fastest.
After the Experiment
Look at what you found out. Did the sugar dissolve faster in warm water? This helps us learn more about how things dissolve.
Safety Reminder
Always remember to wear safety glasses and clean up after our experiments. Being safe is very important in science.
Conclusion
This investigation teaches us about how temperature affects how fast sugar dissolves in water. By doing this, we practice important skills like observing, measuring, and showing our findings. It's all part of being a scientist!
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