Mixtures!

Q: What is the dullest element? A: Bohrium

Key concepts:

• Describe 3 properties of mixtures• Describe and identify the 3 types of mixtures

by their properties• Describe the Tyndall Effect• Give everyday examples of mixtures

Key Vocabulary:

• Mixture• Heterogeneous• Homogeneous• Suspension• Colloid• Solution

Imagine a world of legos:

Make up compounds and mixtures:

ELEMENTS:

Matter

Mixture Pure Substance

ElementCompoundHeterogeneous Mixture

Homogeneous Mixture

Can be separated physically

Cannot be separated physically

Can see the parts

Cannot see the parts

Can be separated chemically

Cannot be separated

Most impure Most pure

Summary:

1.What is the difference between pure and impure substances?

2. What is differences between an solution, colloid and suspension?

3. What are some everyday examples of each type of mixture

Mixtures:

• A mixture is a combination of two or more substances that are not chemically combined.

• Think about trail mix or a pizza…– Can you taste the tomato pasta?

Meat?• You can separate mixtures

physically. – What about compounds?

What does pure mean?

How is this different from an compound?

What are some examples of chemical and physical changes?

Separation!

Types of Mixtures:

• Heterogeneous—you can easily see the particles; may have to use a microscope– Suspension: visible particles settle (you can see

them)• Homogenous—contain 2 or more substances

that are blended evenly throughout (you can’t see the particles) – Solution: mixture that never settles and can’t be

seen with a microscope– Colloid: mixture with larger particles than a solution

but still small enough that they don’t settle out

Tyndall Effect:

• Tyndall Effect: the scattering of light by colloidal particles– Link

TYPES IN GREAT DETAIL:

Solutions:

• Solutions:– Particles are so small NEVER settle

out due to how small they are

Make sure that you know what an alloy is..

Know the differences between solutions and colloids

Colloids:

• Colloid:– A mixture in which the particles are

dispersed throughout but are not heavy enough to settle out.

– Small and mixed well but not as good as solution

– Can’t be filtered but scatter light (the particles)

– Examples:• Milk, mayo, and deodorant

What is a colloid?

Suspension:

• Suspension:– A mixture in which the particles are

dispersed throughout and are heavy enough to settle out.

– Scatter and block light• Dirty lake water

– Can be filtered– Examples:• Salad dressing, medicines, paint

What is a suspension?

This snow globe contains solid par- ticles that will mix with the clear liquid when you shake it up. But the particles will soon fall to the bottom when the globe is at rest.

Review:

• How do mixtures differ from elements and compounds?

• How can mixtures be separated?

Homework:

• Vocabulary cards for the following term:– Mixture

Q-tips says, “Q: Why do chemists call

helium, curium and barium the medical

elements? A: Because if you can't

helium or curium, you barium!