Most Missed Questions/Skills Unit 3

Front

What is the independent variable in an experiment?

Back

The independent variable is the factor that is changed or controlled in a scientific experiment to test its effects on the dependent variable.

Front

What ALWAYS happens during a chemical reaction?

Back

Atoms form new molecules or compounds.

Front

Is solubility a chemical or physical property?

Back

Solubility is a physical property.

Front

What explains the structure, properties, and transformations of matter?

Back

The attraction/repulsion of electric charges.

Front

What is the conclusion about algal growth at different temperatures?

Back

Algae multiply most rapidly at 20°C.

Front

What is a hypothesis in scientific research?

Back

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

Front

What is the dependent variable in an experiment?

Back

The dependent variable is the factor that is measured or observed in an experiment.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change affects one or more physical properties of a substance without altering its chemical composition, while a chemical change results in the formation of new substances.

Front

What is an example of a physical property?

Back

Color, melting point, and solubility are examples of physical properties.