Is Matter Around Us Pure? Blog 3

*We at St Columba's School, are ready to take the next step - and move towards using Google Classroom as a tool to enhance the teaching learning environment.

*This shift involves the school giving each student a unique email address, which he will need to setup ( the teachers will assist him in doing the same). This email will facilitate each student to interact with his teachers.

* The student should use this email ID only for:

-interacting with  teachers on school /subject related matters

-keep the words and expressions as he would- if he  were interacting with us as a Columban student

-use the facilities connected to this email ID only for google meets organised with the permission of a teacher 

-he should have a copy of the permission given ( when and by which teacher and for what purpose)

-do not access any of the other facilities connected with this email address unless he first seeks the permission of a teacher

(He should have a copy of the permission given - when and by which teacher and for what purpose).

*Please note that Google and St Columba's have legal obligations by giving you access to this email address and hence,

you will need to sign an agreement when creating this email ID. 

*Be informed that the history of use of this ID shall have a digital footprint !I 

MATTER AROUND US PURE?

                                             LESSON 3

GOOD MORNING BOYS!

In today’s lesson we will take up another form of pure substance, that is

COMPOUNDS and see how these are different from mixtures.

LEARNING OBJECTIVES-

At the end of today’s class you will be able to-

1) define compound and mixture

2) classify substances as pure/impure

3) distinguish between a mixture and a compound

4) state examples of mixture and compound

5) classify mixtures as homogeneous and heterogeneous.

GENERAL INSTRUCTIONS-  copy everything in BLUE.

A compound is formed when two or more elements chemically combine

to each other.

Eg-        H = one atom of hydrogen element

             2H = two atoms of hydrogen element

             O = one atom of oxygen element

              2H + O = H2O  (water) a compound is formed.

Take another example,

             C = one atom of carbon element

             2O = two atoms of oxygen element

          C + 2O  =   CO2   (carbon dioxide) a compound is formed

(DO NOT DRAW)

COMPOUND

A compound is a substance composed of two or more elements,

chemically combined with one another in a fixed proportion.

Eg – H2O, CO2, NH3 (Ammonia) , H2SO4 (sulphuric acid), NaHCO3 (sodium hydrogen carbonate or baking soda)

MIXTURE

A mixture is constituted by more than one kind of pure form of matter.

Eg – salt water, sugar water, oil and water, air

A mixture is classified as homogeneous or heterogeneous. WATCH VIDEO

             https://youtu.be/EXJgFyPnp1Y     

Homogeneous mixture

A mixture which has a uniform composition throughout.

 Heterogeneous mixture

A mixture which contains physically distinct parts and has a non uniform composition.

        https://youtu.be/o6Iwj-ozLi0    (COMPOUNDS AND MIXTURES)

Differences between a mixture and a compound-  (COPY THE TABLE)

https://youtu.be/IOD6PmT6V1g    👈  LET US SEE IF YOU HAVE UNDERSTOOD                                                                  THIS TOPIC

 ASSIGNMENT

Read pages 25 and 26 NCERT
Also read activity 2.10. 

https://youtu.be/C2RqAE0wbqk

watch the video in reference to the activity and try to answer the questions. you will find answers in the video as well as your NCERT.

GOOD BYE AND TAKE CARE!