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WorksheetsLesson 4: OpenSciEd 6.2 Thermal Energy
Total questions: 38
Worksheet time: 24mins
Why does adding a lid help decrease the amount of water leaving the system?
A lid prevents water molecules from escaping as vapor.
A lid traps all the air inside the system.
A lid makes the system heavier.
A lid changes the chemical composition of the water.
Why does adding a lid help decrease the amount that the water temperature changes?
A lid helps insulate the system, keeping the heat in or out.
A lid introduces cold or hot air into the system.
A lid increases water evaporation.
A lid allows sunlight to reach the water.
What would happen to the temperature of hot water in a cup without a lid compared to a cup with a lid?
The cup without a lid would cool down faster.
The cup without a lid would maintain its temperature.
Both cups would cool down at the same rate.
The cup with a lid would cool down faster.
What is a practical way to measure if mass is lost from the cup systems during the experiment?
By weighing the cups before and after the experiment
By checking the temperature regularly
By observing the color change of the water
By using a thermometer to check the lid’s humidity
Based on the data, what conclusion can you draw about the effectiveness of a lid in reducing temperature change of hot water?
A cup with a lid causes a hot liquid in the cup to drop in temperature less than in a cup without a lid.
A cup with a lid causes a hot liquid in the cup to drop in temperature more than in a cup without a lid.
A cup with a lid causes the same temperature change as a cup without a lid.
A cup with a lid causes an unpredictable change in temperature compared to a cup without a lid.
After reviewing the average temperature changes, why is it beneficial to use the average rather than individual data points for comparison?
It simplifies the data by providing a single value representing the overall trend, reducing variability.
It eliminates the need for detailed analysis of each data point.
It hides any possible errors in measurements.
It makes the data look more consistent than it actually is.
How does weighing each system at the start and end of the experiment provide insights into what happens to the water?
It helps determine if any mass is lost, indicating evaporation or condensation.
It ensures that the water was initially pure.
It confirms the temperature changes measured.
It verifies that the experiment was conducted properly.
Why is it important to develop a model to explain why the mass of the cup system decreases over time?
A model helps visualize and understand the process of evaporation and condensation.
It serves as a physical representation of the data table.
It allows for different types of experiments to be conducted.
It makes the experiment look more scientific.
How does adding a lid help decrease the amount of water leaving the system?
The lid reduces exposure to air, slowing down evaporation.
The lid increases the pressure inside the cup.
The lid causes the water to boil.
The lid prevents the water from heating up.
When water evaporates from the cup system, what is the most logical explanation for where the lost mass goes?
The water molecules evaporate into the air, reducing the mass of the liquid left in the cup.
The mass converts into energy.
If we completely sealed off the cup so no matter could get in or out, why would the temperature of the liquid inside still change?
Heat transfer still occurs through the cup walls, influencing temperature over time.
Evaporation would still happen within the sealed cup.
The liquid would create internal pressure forcing temperature change.
The seal would cause the liquid to gain mass, changing temperature.
Why is it easier to compare the average temperature change from systems with lids to without lids rather than all data at once?
It simplifies the comparison by summarizing the data.
It shows all the data numbers next to each other.
It ensures that no data is lost in calculations.
It creates more complex calculations.
If no scales are available, how can you check if the amount of water in the system is decreasing over time?
By observing a drop in the water level in the cup
By feeling the temperature of the cup
By noting a change in the color of the water
By listening for a change in sound as the water evaporates
Why might it be useful to compare the average temperature change from systems with lids to those without lids, instead of looking at all the data points individually?
It makes it easier to see overall trends and patterns in the data.
It helps to understand each individual observation in more detail.
It allows you to track the time each observation was made.
It ensures that no errors were made during the experiment.
Based on the experiment results, what might be a reason that a cup with a lid loses less temperature than a cup without a lid?
The lid helps to trap heat inside the cup, reducing heat loss.
The lid causes more air to enter the cup, heating the liquid.
The lid makes the cup heavier, which slows down temperature change.
The lid cools the air inside the cup, causing the liquid to stay warm.
How could time-lapse or slow-motion videos help if you didn’t have a scale for measuring mass?
They can visually show changes in the water level over time, indicating mass loss.
They help to capture the temperature changes in the liquid directly.
They automatically calculate the data for you, reducing human error.
They make it easier to hear the water boiling or freezing.
What does a lid on a cup help prevent in terms of water and temperature?
It helps prevent the water from evaporating and losing temperature quickly.
It makes the water heat up faster inside the cup.
It helps the water gain mass over time.
It prevents any temperature change from occurring inside the cup.
Which cup is likely to show a greater decrease in mass over time?
The cup without a lid is likely to show a greater decrease in mass because more water can evaporate.
Both cups will show the same decrease in mass since evaporation happens at the same rate.
The cup with a lid is likely to show a greater decrease in mass because the lid traps the water inside, making it heavier.
How does weighing each system at the start and end of an experiment help us understand what’s happening to the liquid?
Weighing each system helps us see how much water has evaporated by comparing the mass before and after the experiment.
Weighing each system tells us nothing about the changes in the liquid’s mass.
Weighing each system can only tell us if the temperature has changed, not the mass.
Why does adding a lid help decrease the amount of water leaving the system?
Adding a lid reduces evaporation by trapping water vapor inside the cup, keeping the liquid from escaping.
Adding a lid increases evaporation because it makes the water molecules move faster.
Adding a lid has no effect on the amount of water leaving the system.
What is the main reason for using lids on cups during the experiment?
Lids help keep the heat inside the cup, reducing the temperature change.
Lids allow more heat to escape, making the temperature change faster.
What could be a consequence of not sealing the lid properly on the cup?
The liquid might lose more heat than expected because the lid does not fully reduce heat escape.
The liquid will gain more heat because the lid allows more to come in.
The liquid’s temperature will remain unchanged as the lid doesn’t matter.
What might cause a change in mass in the cups with and without lids over time?
Evaporation of liquid
Addition of more liquid
Temperature change
Presence of air
A cup with a lid causes no difference in the amount a hot liquid drops in temperature compared to a cup without a lid.
True
False
The arrows inside the pot show (a)
Evaporation occurs only _____
after boiling
after extreme cooling
at surface of a liquid
if boiling occurs at atmospheric pressure
Steam rising from wet clothes while ironing them. This is an example of__________.
Evaporation
Condensation
Is the underlined phrase the independent variable or the dependent variable?
How does watching TV during studying affect a student’s test grades?
Independent Variable
Dependent Variable
Is the underlined phrase the independent variable or the dependent variable?
Does the flavor of ice cream effect how fast the ice cream melts?
Independent Variable
Dependent Variable
Is the underlined phrase the independent variable or the dependent variable?
Which brand of bubblegum allows for you to blow the largest bubble?
Independent Variable
Dependent Variable
Is the underlined phrase the independent variable or the dependent variable?
Does the type of shoe worn during a 30 meter dash affect the speed of the runner?
Independent Variable
Dependent Variable
In an experiment to determine the effect of different amounts of sleep on test scores, what would be the independent variable?
Test scores
Amount of sleep
Type of test
Time of day the test is taken
Which of the following best describes the relationship between an independent variable and a dependent variable?
The independent variable is changed to observe its effect on the dependent variable.
The dependent variable is changed to observe its effect on the independent variable.
Both variables are changed simultaneously.
Neither variable is changed.
Which of the following is a dependent variable in an experiment measuring the effect of fertilizer on plant height?
Type of fertilizer used
Amount of fertilizer used
Height of the plants
Type of plants used
Factors in an experiment that remain the same.
Independent Variable
Dependent Variable
Control
Constants
What are the constant variables?
what we are changing or testing
what we are observing or measuring
what we keep the same to make the experiment fair
