SEPARATION OF SUBSTANCES -POST 5

GOOD MORNING

Today we will be looking at some activities


ACTIVITY 1:

Collect some muddy water from a pond or a river. If it is not available, mix some soil to water in a glass. Let it stand for half an hour.

Observe the water carefully and note your observations.

THINK: Does some soil settle at the bottom of water? Why? What will you call this process? Now, slightly tilt the glass without disturbing the water. Let the water from the top flow into another glass (Fig.1). What will you call this process? 

Is the water in the second beaker still muddy or brown in colour?

Now filter it.

First, try with a tea-strainer.

Did the tea strainer work?

Let us try filtering the water through a piece of cloth. In a piece of cloth, small holes or pores remain in between the woven threads. These pores in a cloth can be used as a filter.
If the water is still muddy, impurities can be separated by a filter that has even smaller pores.

Commonly used filters are:

1. a piece of muslin cloth

2. filter paper. (shown below)

A filter paper is one such filter that has very fine pores in it.

The figure above shows the steps involved in using a filter paper. A filter paper folded in the form of a cone is fixed onto a funnel (shown in the Figure). 

The mixture is then poured on the filter paper. Solid particles in the mixture do not pass through it and remain on the filter.

OBSERVATION: 

• In a mixture of sand and water, the heavier sand particles settle down at the bottom and the water can be separated by decantation.
• Filtration can be used to separate components of a mixture of an insoluble solid and a liquid. 

Fruit and vegetable juices are usually filtered before drinking to separate the seeds and solid particles of pulp.

Watch this video to see churning

https://www.youtube.com/watch?v=dZ6VrFB2dwM

Liked it?? May be it will encourage you to make your own butter at home.

This is all for today!

BYE

TAKE CARE!