Elements and Compounds Identification

The video tutorial reviews key chemistry vocabulary: atom, element, molecule, and compound. It explains the differences between these terms and provides visual representations. Through examples, the video demonstrates how to identify molecules and compounds, emphasizing that all compounds are molecules, but not all molecules are compounds. The tutorial concludes with practice problems to reinforce learning.

What is the smallest unit of matter?

• Compound

• Atom

• Molecule

• Element

Which of the following is a pure substance made of one kind of atom?

• Molecule

• Element

• Compound

• Mixture

What distinguishes a compound from a molecule?

• Molecules consist of different elements

• Compounds consist of different elements

• Compounds have only one type of atom

• Molecules are always compounds

In the first example, which elements were identified in the picture?

• Carbon and Oxygen

• Chlorine and Magnesium

• Sodium and Fluorine

• Helium and Oxygen

How many molecules were identified in the first example?

• Three

• One

• Two

• None

In the second example, which elements were identified?

• Chlorine and Magnesium

• Hydrogen and Oxygen

• Helium, Oxygen, and Carbon

• Sodium and Fluorine

What is the number of compounds identified in the second example?

• One

• Zero

• Three

• Two

In the third example, what was the only element present?

• Oxygen

• Hydrogen

• Carbon

• Helium

Why was the molecule in the third example not considered a compound?

• It had more than one element

• It had only one kind of element

• It was a mixture

• It was not bonded

In the fourth example, which elements were identified?

• Hydrogen and Oxygen

• Helium and Carbon

• Chlorine and Magnesium

• Sodium and Fluorine