The video revisits the topic of classifying matter, focusing on elements, compounds, and mixtures. It explains pure substances, such as elements found on the periodic table, and compounds, which are chemically bonded elements like water and salt. Mixtures, unlike compounds, are physically combined substances that retain their individual properties, such as tap water and salad. The video provides examples to illustrate these concepts, including copper, jellybeans, and lemonade, and emphasizes the importance of understanding the differences between these categories.

What is a pure substance?

• A combination of two or more compounds

• A mixture of different elements

• A sample of matter with definite chemical and physical properties

• A substance that can be separated by physical means

Which of the following is an example of a pure substance?

• Air

• Salt water

• Sand

• Copper

What defines a compound?

• A single type of atom

• A mixture of different substances

• A combination of elements joined by a chemical bond

• A substance that can be separated by physical means

Which of the following is a compound?

• Hydrogen

• Oxygen

• Water

• Gold

Tags

NGSS.MS-PS1-1

What is a mixture?

• A compound with a specific ratio of elements

• A single type of element

• A substance with definite chemical properties

• A combination of two or more pure substances not chemically combined

Which of the following is an example of a mixture?

• Distilled water

• Air

• Gold

• Table salt

What is the atomic number of copper?

• 31

• 30

• 29

• 27

Which of the following is an element?

• Table sugar

• Diamond

• Salt

• Tea

What makes table sugar a compound?

• It is made up of a single type of atom

• It can be separated by physical means

• It is a mixture of different substances

• It is composed of carbon, hydrogen, and oxygen atoms bonded together

Tags

NGSS.MS-PS1-1

Why is lemonade considered a mixture?

• It is made up of a single type of element

• It has a definite chemical formula

• Its components are chemically bonded

• Its components are not chemically bonded and can be separated physically