TED-Ed: The science of macaroni salad: What's in a mixture? - Josh Kurz

The video tutorial explains how various objects, despite their differences, are made of the same basic components combined in different ways. It uses macaroni salad to illustrate the concept of mixtures, which are combinations of ingredients without changing their chemical identities. The tutorial covers three main types of mixtures: suspensions, solutions, and colloids, providing examples for each. It further explains how these mixtures can be broken down into smaller components, eventually reaching the molecular level, and discusses the need for chemical processes to separate these molecules further.

What is a mixture in terms of chemical identity?

• A combination of substances that changes their chemical identity

• A combination of substances that retains their chemical identity

• A single substance with a new chemical identity

• A combination of substances that forms a new element

Which of the following is an example of a suspension?

• Vinegar

• Muddy water

• Saltwater

• Whipped cream

What distinguishes a solution from a suspension?

• Solutions have particles that are molecules, while suspensions have larger particles

• Solutions change the chemical identity of the substances involved

• Solutions are always liquid, while suspensions are solid

• Solutions have larger particles than suspensions

Which of the following is a characteristic of a colloid?

• Particles are large and easily separated

• Particles are dissolved completely

• Particles are small and do not separate easily

• Particles form a new chemical compound

What is required to further separate molecules in a mixture?

• Adding more water

• Breaking chemical bonds

• Mixing with another substance

• Increasing temperature