Exercise
Form 11: Constants and Controlled Variables in Chemistry
In this exercise, students will explore the critical roles of constants and controlled variables in scientific experiments, focusing on how these factors ensure accurate and reliable results in chemistry. Through hands-on activities and experiments, learners will design their own investigations, identify variables, and analyze data to understand the importance of maintaining consistency in their research.
Questions
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MultiChoice
When investigating dissolving speed of sugar in water at different temperatures, what must be constant?
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MultiChoice
In a chemical reaction test comparing reaction rates with different acid concentrations, what is a constant?
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MultiChoice
Why must test tube size be kept constant when comparing chemical heat release?
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MultiChoice
Testing baking soda and vinegar reactions, if vinegar amount is varied, baking soda amount must be:
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MultiChoice
Which factor should be kept constant when testing rust formation on iron nails in different liquids?
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MultiChoice
When measuring pH of different household liquids, what is a controlled variable?
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MultiChoice
In an experiment on enzyme activity at different pH levels, what should remain constant?
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MultiChoice
Maintaining identical air pressure during gas volume experiments ensures that air pressure is a:
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MultiChoice
What is the constant in an experiment testing glow stick brightness in hot vs cold water?
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MultiChoice
In testing catalyst amounts on oxygen production, what must be controlled?
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MultiChoice
If a chemist forgets to keep solution volume constant across trials, what occurs?
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MultiChoice
Constants in a chemistry experiment ensure that changes in the dependent variable are caused ONLY by: