8th Grade T3L1 p.93-94

Mixtures and Solutions

Types of Mixtures

What is a Mixture?

- Mixtures are made up of two or more substances that are together but not chemically combined.

-The substances in a mixture keep their own properties, unlike compounds which are chemically bonded

Multiple Choice

Which of the following is a mixture?

• Aluminum Foil

• Table Salt

• Lemonade

• Copper

Types of Mixtures

Heterogenous Mixture

- Heterogeneous mixtures have distinct components that can be easily seen and sorted.
- Heterogeneous mixtures can have uneven distribution of components.


Examples: Trail Mix, Salad, Spaghetti and Meatballs

Types of Mixtures

Homogenous Mixtures

- Homogeneous mixtures have a uniform appearance throughout the entire mixture, making it difficult to distinguish their different components.

Examples: saltwater, honey, and soy sauce

Multiple Choice

Lucky Charms

• Heterogeneous

• Homogeneous

Multiple Choice

Freshly brewed black coffee

• Heterogeneous

• Homogeneous

Multiple Choice

Dirt

• Heterogeneous

• Homogeneous

Multiple Choice

Air

• Heterogeneous

• Homogeneous

Multiple Choice

Trail Mix

• Heterogeneous

• Homogeneous

Separating Mixtures

- Components in a mixture keep their properties, allowing for separation based on these properties.


- Mixtures with particles of different sizes can be filtered to remove larger particles.

Separating Mixtures

- Mixtures containing magnetic components can be separated using a magnet


- Liquid mixtures can be heated to evaporate some components and leave behind solids.

Multiple Choice

Which tools are best for separating a mixtures of sand, iron filings, and water?

• Hot plate and filter

• Tweezers and filter

• Filter and magnet

• Magnet and hot plate

Multiple Choice

Which substances, when mixed together, maintain their original physical properties?

• gravel and water

• wood chips, water and sand

• sand and water

• all of the above

Multiple Choice

All of the following are examples of containers filled with mixtures EXCEPT -

• a jar filled with trail mix

• a glass filled with lemonade

• a bowl of cereal with milk

• a cup of fruit salad

Multiple Choice

Which mixture can be separated using a filter?

• sand and iron filings

• saltwater

• sand and water

• none of the above

Multiple Choice

A cup of orange juice with pulp is poured into a glass. Which of these procedures could be done to separate the juice from the pulp?

• pour the juice through a coffee filter

• heat the juice in a pot until boiling

• pour the juice in another cup

• allow the mixture to settle, leaving the pulp at the bottom of the glass

Multiple Choice

Which of the following mixtures can be separated with a magnet?

• sand and salt

• sand and iron filings

• sugar and water

• saltwater

Multiple Choice

All of these can be separated easily EXCEPT -

• nuts, bolts, and screws

• powdered drink mix, sugar and water

• sand and water

• iron filings and sand

Multiple Choice

A mixture of iron filings and chalk dust is placed on a plate. Which of the following could be done to gather the iron filings?

• Pour the mixture into a funnel

• Put the mixture in a pot on the stove

• Run a magnet over the mixture

• Filter the mixture through a strainer