Nature of Science Practice State Test - 2 answers

Front

What is a limitation of a 2D drawing of a cell compared to a clay model?

Back

A 2D drawing cannot represent a living cell, since a true cell is three-dimensional.

Front

How does the density of water change with temperature?

Back

The density of water increases, then decreases with temperature.

Front

What is a result of new scientific research?

Back

A newly discovered chemical element will be added to the periodic table of the elements.

Front

Why should a student use repeated trials in an experiment?

Back

To ensure that his experimental results are accurate and the experiment did not contain flaws.

Front

What is the dependent variable in an investigation studying the relationship between age and number of teens with cell phones?

Back

Number of teens with cell phones.

Front

What is a scientific model?

Back

A scientific model is a representation of an object or system that helps to explain and predict its behavior.

Front

What is the purpose of conducting scientific experiments?

Back

To test hypotheses and gather data to support or refute scientific theories.

Front

What is the scientific method?

Back

A systematic process for investigating phenomena, acquiring new knowledge, or correcting and integrating previous knowledge.

Front

What is a hypothesis?

Back

A hypothesis is a testable prediction about the relationship between two or more variables.

Front

What is the difference between independent and dependent variables?

Back

The independent variable is manipulated by the researcher, while the dependent variable is measured to see how it is affected.