ACT Science Practice

Front

What is an independent variable in an experiment?

Back

An independent variable is the factor that is manipulated or changed in an experiment to observe its effects on the dependent variable.

Front

What is a dependent variable in an experiment?

Back

A dependent variable is the factor that is measured or observed in an experiment, which is affected by changes in the independent variable.

Front

What is the purpose of using a control group in an experiment?

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A control group is used to provide a baseline for comparison, helping to isolate the effects of the independent variable.

Front

What does DOC stand for in environmental science?

Back

DOC stands for Dissolved Organic Carbon, which is a measure of the organic matter present in water.

Front

What is the significance of electromagnetic energy in the breakdown of DOC?

Back

Electromagnetic energy, particularly in the visible wavelength range, can break down DOC into simpler compounds, affecting water quality.

Front

What is leachate?

Back

Leachate is a liquid that has percolated through a solid and leached out some of the constituents, often used in studies of soil and water interactions.

Front

What is the role of clay minerals in water treatment?

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Clay minerals can absorb organic compounds and pollutants from water, helping to improve water quality.

Front

What does it mean for a mixture to be considered a solution?

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A solution is a homogeneous mixture where one substance (the solute) is dissolved in another (the solvent), resulting in a single phase.

Front

What is the difference between a solution and a suspension?

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A solution is a homogeneous mixture where particles are dissolved, while a suspension contains larger particles that are not fully dissolved and can settle over time.

Front

How can the effectiveness of clay minerals in absorbing DOC be measured?

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The effectiveness can be measured by comparing the concentration of DOC before and after treatment with clay minerals.