Pure

The video tutorial explains the concept of purity in chemistry, describing how elements, compounds, and mixtures like honey or maple syrup can be considered pure. It also covers how purity is often expressed as a percentage, indicating the presence of other materials. For example, a substance labeled as 99% pure may still contain 1% of other materials.

Which of the following can be described as pure in chemistry?

• Only mixtures

• Elements, chemicals, compounds, or mixtures

• Only compounds

• Only elements

Which of the following is an example of a mixture that can be described as pure?

• Gold

• Water

• Honey

• Salt

How is purity often expressed in chemistry?

• As a percentage or proportion

• As a weight

• As a color

• As a volume

What does it mean if a substance is 99% pure?

• It is completely pure

• It may contain up to 1% of other materials

• It contains 99% of impurities

• It contains no other materials

Why is it important to understand the percentage of purity in a substance?

• To understand the amount of other materials present

• To calculate its volume

• To know its exact weight

• To determine its color