Week 6

Class 1

Mixtures Reading Comprehension

Today we will use the short class to review the main aspects of mixtures and we will learn some vocabulary terms such as: colloids, suspensions and more. This classwork will be solved individually and the answers should be written in the notebook:

Class 2

Mixtures Separation Lab Practice

Class 3

Physical and Chemical Changes

During this class we will separate some mixtures and will learn more about how to solve an oil spill when this kind of accident happens. For this, we will go through 4 different stations:

Matter is capable of undergoing changes, which are classified as either physical or chemical. Physical changes in matter are reversible: An ice cube can melt into liquid water, and then the liquid water can be frozen back into an ice cube. Chemical changes, on the other hand, are not reversible: A log burned in a fire turns into ashes, but the ashes cannot be changed back into a log.

Today we will learn the difference between these two types of changes. In the future, we will be able to differentiate easily between a simple physical change and a chemical reaction, and even classify the type of reaction.

And if you feel confused about the difference between chemical changes and physical changes and how to tell them apart, you can think of this hint: a chemical change produces a new substance, while a physical change does not.

1. Copy the table in your notebook and complete it with the help of the BYJUS website:

2. Draw and classify the following processes as chemical or physical changes. Write at least one reason for the classification you decided:

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Oil and water Mixture
STATION

Grains Mixture
STATION

Iron and Sulfur Mixture
STATION

Oil Spills Reading
STATION

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Dissolving table salt (sodium chloride) into

liquid water.

Brass (latón in Spanish ) is an alloy that can be found on decorative hinges and knobs, as well as on musical instruments like trumpets, trombones, and saxophones. Brass is made up of about 60 percent copper and 40 percent zinc. Creating brass is physical or chemical?

Food digestion: the food we swallow mixes with acids and enzymes in our stomachs and intestines

Souring milk involves its acidification, which gives the milk a tart taste, is achieved either through bacterial fermentation or through the addition of an acid, such as lemon juice or vinegar.