Understanding Molecules and Compounds

The video tutorial explains the difference between molecules and compounds. Molecules consist of two or more elements chemically bonded, such as O2 and H2O. Compounds are a type of molecule with two or more different elements, like CaCl2 and HCl. The video provides examples and practice exercises to help viewers identify molecules and compounds, concluding with a summary of the key points.

What is the relationship between molecules and compounds?

• All molecules are compounds.

• Compounds are not molecules.

• All compounds are molecules.

• Molecules and compounds are unrelated.

Which of the following is an example of a molecule?

• C

• Fe

• O2

• NaCl

What distinguishes a compound from a molecule?

• Compounds consist of two or more identical elements.

• Compounds are not chemically bonded.

• Compounds have only one element.

• Compounds consist of two or more different elements.

Which of the following is a compound?

• H2O

• Fe

• O2

• P4

Why is CH4 considered a compound?

• It has more than two identical elements.

• It has more than two different elements.

• It has only one type of element.

• It is not chemically bonded.

What makes P4 only a molecule and not a compound?

• It has different elements.

• It has identical elements.

• It is not chemically bonded.

• It has more than two elements.

Which of the following is NOT a compound?

• P4

• CaC2

• CH4

• HCl

Which of the following is both a molecule and a compound?

• Fe

• CaSO4

• P4

• O2

What elements are present in calcium sulfate?

• Calcium and oxygen only

• Calcium and sulfur only

• Sulfur and oxygen only

• Calcium, sulfur, and oxygen

What is the key difference between a molecule and a compound?

• Molecules have more than two elements.

• Molecules are not chemically bonded.

• Compounds have identical elements.

• Compounds have different elements.