ACT Science Practice

Front

What is DOC in the context of environmental science?

Back

DOC stands for Dissolved Organic Carbon, which refers to organic molecules that are dissolved in water and can affect water quality and ecosystem health.

Tags

NGSS.HS-ESS2-5

NGSS.HS-LS2-5

Front

What is a leachate?

Back

A leachate is a liquid that has percolated through a solid and leached out some of the constituents of that solid.

Tags

NGSS.MS-PS1-2

Front

What is the difference between a solution and a mixture?

Back

A solution is a homogeneous mixture where one substance is dissolved in another, while a mixture can be heterogeneous and may not have uniform composition.

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.

Tags

NGSS.MS-PS3-1

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 role does electromagnetic energy play 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 the purpose of placing samples in the dark during an experiment?

Back

Placing samples in the dark prevents light-driven processes, such as the breakdown of DOC by electromagnetic energy, from occurring.

Front

What are clay minerals and their significance in environmental studies?

Back

Clay minerals are fine-grained natural rocks that can absorb and interact with various substances, including DOC, influencing soil and water chemistry.

Tags

NGSS.HS-ESS2-5

Front

What is the significance of studying leachates from different types of leaves?

Back

Studying leachates from different types of leaves helps understand how different organic materials affect water quality and the behavior of DOC.

Tags

NGSS.HS-ESS2-5

NGSS.HS-LS2-6

Front

What does it mean for a clay mineral to reduce DOC?

Back

Reducing DOC means that the clay mineral has absorbed or interacted with the dissolved organic carbon, decreasing its concentration in the solution.