Unit 13 Lesson 4 What Are Mixtures and Solutions?Copyright © Houghton Mifflin Harcourt Publishing Company Unit 13 Lesson 4 What Are Mixtures and Solutions?. Title: PowerPoint Presentation

Unit 13 Lesson 4 What Are Mixtures and Solutions?

Copyright © Houghton Mifflin Harcourt Publishing Company




Matter Mix-Up


• A mixture is a combination of two or more substances that keep their identities.

• Making a mixture is a physical change.

images/mixture.PNG

videos/mixtures and solutions.mp4


Matter Mix-Up


C.W Q1:

Find a Solution!


• A solution is a mixture that has the same composition throughout.

(evenly mixed)

• A solution forms when one substance dissolves in another.


images/solution.PNG

Find a Solution!


• When a substance dissolves, it breaks into tiny particles that can’t even be seen with a microscope.

• These particles evenly mix with the other parts of the solution.

• Not all substances can dissolve. For example, if you put a rock and salt in water, the rock won’t dissolve but the salt will.


videos/Dissolving Experiment for Kids Simple Science Experiments.mp4

Find a Solution!


• Many solutions are liquids.

• Some solutions are gases or solids.

• For example, air is a solution of tiny particles of nitrogen, oxygen, and other gases.(gas)

• Brass is a solid solution.


Find a Solution!



C.W Q2:

Find a Solution!



Practice:

Find a Solution!



C.W Q4:

Find a Solution!



Practice:

Separating Mixtures


• A mixture can be separated. Each component in a mixture keeps most of its physical properties.

• Physical properties such as color, size, melting point, boiling point, density, and ability to dissolve can be used to separate mixtures.

• Mixtures can be easy or difficult to separate.


Separating Mixtures



C.W Q4:

When One Isn’t Enough


• A sieve, or mesh screen, has

holes that matter can pass through. Smaller matter passes through the screen while larger matter stays in the sieve.

• A magnet attracts matter that contains iron, separating it from the other parts of the mixture.


videos/separation of mixtures.wmv

When One Isn’t Enough


• Filters have tiny openings, or pores, where only the smallest bits of matter, like water particles, can pass through.

• Boiling changes a liquid to a gas at the liquid’s boiling point. Evaporation changes a liquid to a gas below the liquid’s boiling point.

• During boiling and evaporation, liquid particles leave the solution while dissolved particles stay behind.


Proportions and Properties


• Mixtures can have different properties depending on the amounts of each ingredient.

• An alloy is a mixture of metals and other substances.

• Steel is an alloy made from iron and other substances.




• Different substances give steel different properties.

• Adding chromium makes steel shiny.

• Metals such as nickel and titanium can keep steel from rusting.

• Adding carbon can make steel stronger.





C.W Q5:




C.W Q6:





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Unit 13 Lesson 4 What Are Mixtures and Solutions?Copyright © Houghton Mifflin Harcourt Publishing Company Unit 13 Lesson 4 What Are Mixtures and Solutions?. Title: PowerPoint Presentation