Chemistry Laboratory Experiment on Separating Mixtures
Auto Beauty Business Culture Dieting DIY Events Fashion Finance Food Freelancing Gardening Health Hobbies Home Internet Jobs Law Local Media Men's Health Mobile Nutrition Parenting Pets Pregnancy Products Psychology Real Estate Relationships Science Seniors Sports Technology Travel Wellness Women's Health

Chemistry Laboratory Experiment on Separating Mixtures

Know how to prepare mixtures and investigate it's properties. Know how to separate mixtures into components.

Theory:

"Matter" is anything that occupies space and has mass and weight.  Matter is classified into pure substance and mixtures.  Pure substance cannot be separated by physical means like filtration.  Mixtures are combination of two or pure substances in variable proportions.  Blood, foggy air, soil and vegetable soup are few examples of mixtures.                                                                                                          

Mixtures can be classified as homogeneous mixtures and heterogeneous mixtures.  Homogeneous mixtures have the same properties and definite composition in all parts of mixtures.  Homogeneous mixture are also called "solution". Examples of homogeneous: Water-salt mixture and water alcohol mixture. Seawater and metal alloys are also examples of homogeneous mixtures.  Heterogeneous mixtures do not have the same properties through out in their compositions.  Example of heterogeneous mixtures: Water oil mixtures and water-powder chalk mixture.

                                             Foggy air

                                               Edited Image

Mixtures consist of two or more pure substances.  One of the distinctive characteristics of a mixture of substances is that it is usually possible to separate the constituents by physical means.  There are many different methods to separate  a wide variety of mixtures, and the particular method employed for any given depends upon the nature of it's constituents.

                                             Vegetable soup

                                               Edited Image

Objectives:

a)  To prepare the mixtures and investigate its properties.

b)  To separate mixtures into components.

Apparatus:

Funnel, 50-ml beaker, evaporating dish, filter paper, thermometer, magnet, magnifying glass, watch glass, iron powder (fillings), plastic comb, glass rod, distilled water, alcohol, salt, powder chalk, sulfur powder, dry powdered red pepper, sand

Procedure:

1)  Take a spoonful of iron powder (fillings) and a spoonful of sulfur powder onto a piece of paper.  Examine the mixture with naked eyes.  Bring the magnet near the mixtures on the paper.  Record your observation.

 

2)  Put a spoonful of table salt and a spoonful red pepper into the 50-ml beaker.  Mix the substances well.  Pour some of the mixture on a clean piece of paper.  Rub the comb with your "maong" pants.  And bring the electrified end of the comb near the salt-pepper mixture on the paper, but do not touch it.  Record your observation.  Transfer the component attracted by the comb onto the watch glass.

3)  Take a spoonful of table salt and a spoonful of sand onto a piece of paper.  Stir the mixture well.  Then put the mixture into the beaker, which contains water.  Filter the mixture and then evaporate the water.  Record your observation.

 

4)  Mix 10 ml water, 10 ml alcohol, 10 g of salt and 10 g of powder chalk in a beaker.  Filter this mixture using funnel and filter paper and observe.  What is the compound on the filter paper?  Record your observation.

 

 

DISCUSSION TOPICS:

  1. In procedure 1 could you see the bits of iron and sulfur in the mixtures?
  2. Do iron and sulfur lost their characteristic properties (say color) during the formation of the mixture?
  3. Supposed two substances are mixed to give a mixture.  Are the properties of the substances changed by this mixing process?
  4. Give two (2) methods used to separate mixtures.

Prepared by: Jessie Agudo, B.S.Civil Engg'/M.A.Teaching Mathematics

ANSWERS/EXPLANATION (Below):

 

Need an answer?
Get insightful answers from community-recommended
experts
in Science on Knoji.
Would you recommend this author as an expert in Science?
You have 0 recommendations remaining to grant today.
Comments (3)

Excellent work! Thumbs up

Thank you Jessie, for this interesting work. Voted. Thanks for your support.

Ranked #4 in Science

Thanks for dropping by Chris and Sir paulose...

ARTICLE DETAILS
RELATED ARTICLES
RELATED CATEGORIES
ARTICLE KEYWORDS