Mixtures and Solutions

Mixtures and Solutions
(A Review)

By Rolando Alvarez

Open Ended

What happens when you stir sugar into water?

Key Vocabulary

Mixture- A combination of two or more substances that can be separated.

Solution- A special type of mixture where one substance dissolves into another.

Solute- The substance that dissolves.

Solvent- The substance that does the dissolving.

Dissolve- When a substance breaks apart and spreads evenly in a liquid.

One substance dissolves into another, forming a homogenous mixture.  The substances are indistinguishable from each other and the mixture has a uniform appearance. Homogeneous mixtures are also known as solutions. 

Solutions

Substances that are mixed and make a heterogenous mixture. The components of a heterogeneous mixture can be distinguished visually and separated into their original parts either by hand or using tools.

Mixtures

Mixtures vs Solutions

Listen for directions

Categorize

Options (7)

Salt & Water

Oil & Water

Sugar & Water

Sand & Water

Lemon & Water

Organize these options into the right categories

Mixture (Heterogenous)

Solution (Homogenous)

Neither

A nice beverage

​water + sugar + lemon juice

​​Lemonade

salt + water

​​Saltwater

​water + coffee + sugar + milk

​​Coffee

​Examples of Solutions

​What is dissolving?

Dissolving happens when water breaks apart the tiny particles (molecules) of a substance and spreads them out.

Water is made of special molecules that have tiny electrical charges.

Some substances like sugar and salt have similar charges, so water pulls them apart and they dissolve.

Other substances like oil or sand don't have the right charges, so they don't dissolve in water.

​

Some substances do not dissolve!

Multiple Choice

What is a mixture?

• A combination of substances that keep their properties

• A single substance

• A chemical reaction

Multiple Choice

Which is an example of a solution?

• Fruit Salad

• Sand and water

• Saltwater

Multiple Choice

What is the substance that dissolves in a solution called?

• Solvent

• Solute

• Mixture

Multiple Choice

What happens to sugar when it dissolves in water?

• It disappears forever

• It turns into a gas

• It breaks into tiny particles that spread throughout the water

Multiple Choice

Which of these is NOT a solution?

• Lemonade

• Milkshake

• Rocks and pebbles

Multiple Choice

Which of the following can separate a solution?

• Stirring

• Evaporation

• Freezing

Multiple Choice

Why does salt dissolve in water but not in oil?

• Oil is too thick

• Water molecules help break the salt apart

• Salt can only dissolve in cold liquids

Multiple Choice

What is the universal solvent?

• Oil

• Water

• Sugar

Closure

What is the difference between a mixture and a solution?

Why does oil not dissolve in water?



If we put too much sugar in water, will it dissolve? Why or why not?

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