Teacher/s

Tr. Belen Garcia and Tr. Kenisha Reyes

School August Pine Ridge Roman Catholic School

Class Standard IVSubject Science Date February 15-19, 2016Duration 45 minutes 1 lessons

Topic: Lesson Content Key Vocabulary

Heterogeneous Mixture

A mixture can also result in two or more phases clearly separated by boundaries. Very often, the separation can be clearly seen by the eye. A heterogeneous mixture is one that does not have uniform properties and composition. Take a look at a bowl of cereal with nuts. A spoon full will surely have different number of nuts than a second spoonful taken at random. Another example—take some sea-sand into your palms. Look at it closely and you will notice that some sand particles are bigger than others, and the colors of some particles may be different too. They are NOT uniform in anyway!

Heterogeneous mixtures include colloids, emulsions or suspensions.

Suspension

A suspension is a heterogeneous mixture of a liquid and a solid. The solid usually

does not dissolve, and can be very visible to the eye. Sometimes the solids are heavy, and large enough for sedimentation (particles settling down in layers) in the container holding it. Unlike colloids, regular agitation is needed to keep mixture fairly mixed.

An example of a suspension is a mixture of sand and water.

Emulsion:

An emulsion is a suspension of a liquid within another liquid. An oil and vinegar salad dressing is a good example of an emulsion, as is the fat within breast milk. Butter, margarine and mayonnaise are also good examples of emulsions, as fats continually surround droplets of water. (oil and water)

Mixtures: are physical combinations of pure substances that have no definite or constant composition

Composition: the way in which a whole or mixture is made up.

Suspension- A suspension is a heterogeneous mixture of a liquid and a solid

Emulsion- is a suspension of a liquid within another liquid

Colloids- a mixture that is uniform with the naked eye but in reality the solute is not completely dissolved

Lesson plan

Some good characteristics of suspensions are:

1. It is cloudy (not as clear as a solutions).

2. It can be filtered.

3. The larger particles settle at the bottom.

4. It is a mixture of two phases.

Colloids

A colloid (also known as colloidal dispersion) may look like a homogenous mixture, because the mixture looks very uniform. Under a bit of magnification, the solute is not completely dissolved, and the particles are big enough, making the entire mixture cloudy.

For example—Mayonnaise is a mixture of egg yolk, vinegar and lemon juice. It is whisked smoothly to a degree that it feels so smooth, but under a microscope, the solute is not completely dissolved. Examples of colloids are Milk, Mayonnaise, Butter, Egg Whites.

References: http://www.dummies.com/how-to/content/how-to-distinguish-pure-substances-and-mixtures.html

https://www.youtube.com/watch?v=KRvsPh4pU90

http://www.eschooltoday.com/science/elements-mixtures-compounds/types-of-mixtures.html

Monday Objectives- Through experiments and a video students will be able to Differentiating between Solution, Emulsion and Suspension

1. Differentiate between a solution, suspension, emulsion

2. Record their discoveries on a table

3. Explain what is a solution or colloid and emulsion

4. Place Cooperate with their group members to complete the tasks given

Introduction Materials

Have a quick review of what a mixture is and the different types by playing pass the paper ball with them

Place the word Mixture on the board

3 Dixie cups,3 plastic spoons, salt black pepper, consume, soy sauce, melted butter, cool-aid, cooking oil

Elicit the two types of Mixtures they learned last class etc..

Development Class setting Draw children attention on the second type of mixtures

( Heterogeneous mixtures) Explain to children that Heterogeneous mixtures can include 3

types of mixtures ( suspension, emulsion, colloids) Present children with a short video explaining the 3 mixtures.

https://www.youtube.com/watch?v=b3HS_woWaJQ

Elicit from children what they understood from the video Deduce the meaning s for each as class and give an example.( can

be the ones from the video) Have children get in groups of 4 or 5 and have them conduct mini

experiments.( guide students throughout) place instructions on the board they will draw table labelled (emulsion, solution, suspension) They will do one mixture at a time they will categorize the mixture as either a suspension, solution or

a emulsion they will record this in their table after experiment have students sit together and write what they

discovered

Whole class teachingPairsGroupingPeer to peerOutdoors activityIndividual workOther

Conclusion Assessment Strategy students will be placed in pairs to answer the following questions: In your own words explain what is a :

emulsionsuspensionsolution

Give an example of each

Class discussion, participation, experimenting, recording, presenting

Assignments

Strength:

Weakness:

Plan of improvement: