Front

How are elements arranged on the periodic table?

Back

Elements on the periodic table are arranged in increasing atomic number.

Front

What are the elements and atoms in the formula Na2SO4?

Back

Sodium 2, Sulfur 1, Oxygen 4.

Front

What causes currents in the atmosphere?

Back

Currents in the atmosphere are caused by warm air rising and cold air sinking.

Front

Why does Texas experience hurricanes in August instead of January?

Back

Texas experiences hurricanes in August because ocean temperatures are higher in August than in January.

Front

What is the best example of a chemical reaction?

Back

The best example of a chemical reaction is the formation of a precipitate.

Front

What is an atom?

Back

An atom is the smallest unit of an element, consisting of protons, neutrons, and electrons.

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 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 significance of the atomic number?

Back

The atomic number indicates the number of protons in the nucleus of an atom and determines the element's identity.

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.