Front

What is the area of a triangle formula?

Back

Area = 1/2 * base * height.

Front

What is an independent variable in an experiment?

Back

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

Front

Why do scientists create models?

Back

Scientists create models to help answer questions about the real world that are too small to be seen or too complex to understand directly.

Front

What is the relationship between CO2 concentration and temperature?

Back

As CO2 concentration increases, the temperature tends to increase due to the greenhouse effect.

Front

What are the atomic numbers of Lithium, Beryllium, Sodium, and Magnesium?

Back

Lithium (3), Beryllium (4), Sodium (11), Magnesium (12).

Front

What is the definition of a chemical element?

Back

A chemical element is a pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of chemical elements, organized by their atomic number, electron configuration, and recurring chemical properties.

Front

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

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together, representing the smallest fundamental unit of a chemical compound.