Classifying Matter: Key Concepts and Applications

What is the main topic of today's chemistry class?

• The periodic table

• Chemical reactions

• Classification of matter

• Atomic structure

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is a pure substance?

• Sodium

• Air

• Salt water

• Sand

What is an element?

• A compound of different atoms

• A mixture of two or more substances

• A pure substance that cannot be broken down any further

• A substance that can be broken down into simpler substances

Which of the following is an example of a compound?

• Gold

• Oxygen

• Sodium chloride

• Hydrogen

Tags

NGSS.MS-PS1-1

What is the difference between a compound and a mixture?

• Compounds are made of one element; mixtures are made of multiple elements

• Mixtures are pure substances; compounds are not

• Compounds can be separated by physical means; mixtures cannot

• Compounds are pure substances; mixtures are not

What does 'homogeneous' mean in the context of mixtures?

• Different throughout

• Contains multiple elements

• Same throughout

• Contains only one element

Which of the following is a homogeneous mixture?

• Salad

• Chocolate chip cookie

• Salt water

• Granite

What does 'heterogeneous' mean in the context of mixtures?

• Contains only one element

• Different throughout

• Same throughout

• Contains multiple elements

Which of the following is a heterogeneous mixture?

• Milk

• Salt water

• Air

• Chocolate chip cookie

How can students ask questions if they have any doubts?

• By raising their hand during phone calls

• By tweeting at the teacher

• All of the above

• By sending a message on Schoology