Elements and Compounds Flashcard

Front

The smallest unit of matter that retains the chemical identity of the elements

Back

Atom

Front

A pure substance made of one kind of atom that cannot be broken down chemically into simpler substances.

Back

Element

Front

A pure substance made by chemically combining two or more elements; represented by a chemical formula.

Back

Compound

Front

The simplest unit (particle) of a compound that can exist; formed when two or more atoms combine chemically.

Back

Molecule

Front

Oxygen forms molecules made of two atoms, O₂. Carbon and oxygen form molecules made of one carbon atom and two oxygen atoms, CO₂. Which of the statements below is true?

Back

O₂ is a molecule while CO₂ is a compound.

Front

What chemical symbol is common in the formulas of aluminum hydroxide (AlOH₃), potassium hydroxide (KOH), and sodium hydroxide (NaOH)?

Back

O

Front

Compare the two chemical formulas CO and CO₂. What is a similarity between them?

Back

They both represent one molecule