Introduction to Traffic Signs

Introduction to Traffic Signs

            Road traffic Signs are important to all citizens and not just new drivers and pedestrians. The main reason why these signs are available on the road is because of SAFETY. Traffic signs make sure that all drivers are aware of the rules and the dangers on the road.  If we don’t follow them the frequency of accidents will  increase.

Enjoy the presentation and follow Traffic Signs. They are for you and me.

Accidents, and particularly street and highway accidents, do not happen – they are caused.  ~Ernest Greenwood

“Concern for man himself and his safety must always for the chief interest of all technical endeavours.” -Albert Einstein 

Lesson plan: Water is a precious resource

Save Water

Topic: Water shortage

Objective:

- To talk about the use of water in everyday life

- To discuss role of each individual in avoiding wastage of water

Level: Class VII

Author : Mrs. Shephali Bose, K.V Bhandup

Introduction:

This lesson looks at the causes of water shortages locally and internationally and learners will produce a poster giving advice on saving water in the home or in the school. Learners are encouraged to ask questions about water conservation in their area and to write to their local authorities with their questions.

Student activity: Student will make videos using Alice in a group to depict

• Uses of water
• Top ten ways in which  water is wasted
• Ways to save the water.
• Give presentation to create awareness

Life skills to learn:

• Saving water
•  Learn from Observation
•  Harness the power of Technology
• Care of natural resources

Quiz on Chemical Bond

Spend a few minutes to refresh your knowledge on chemical bonding. This is captured as a video. Study the .a3p file to understand how to design a quiz . Try it yourself.It is great fun!




Click here to download the .a3p file

Science in Daily Life: Force

Topic	Science in Daily Life: Force
Done By	Nirupam V, Class IX C KV Kanjikode
Subject	Physics
Class	VIII
Objectives	Using Alice to create animation Learning to create story board for animations Create animated clips of basic science concepts Develop presentation skills
Resources/References	Alice 3.1 Windows Movie Maker Class VIII NCERT Science Textbook

Formation of Covalent Bonds

Sample Plan : Formation of Hydrogen, Oxygen and Nitrogen Molecules

Overview :

The presentation on Alice World is to make students of Class IX to understand formation of  covalent bonds involving single, double and triple bonds.

Curricular Topic:  Covalent Bond

Author : Mrs.K. Ameeta , KVS ZIET, Chandigarh

Learning Objectives:

To enable the students to:

·         identify the instability of hydrogen ,oxygen and nitrogen atoms . 

·         understand the possibility of gaining stability by sharing of electrons.

·         know about covalent bonds.

Activity Duration:

15 min – demonstration for each kind of covalent bond

Materials Required:

 LCD Projection system

 Alice 3 software 

Formation of Covalent Bond

A covalent bond is formed when the atoms of same or different elements combine by mutual sharing of electrons. Covalent compounds are formed only by the interactions of non-metal atoms. The number of atoms which make up covalent molecules is determined by the number of electrons in outer levels and the Octet Rule. 

 

HYDROGEN: Forms single Covalent Bond

The simplest covalent molecule is the diatomic hydrogen molecule.

The "octet" for hydrogen is only 2 electrons since the nearest noble gas is He. The diatomic molecule is formed because individual hydrogen atoms containing only a single electron are unstable. The covalent bond holds the two atoms together because the pair of electrons is attracted to both nuclei.

OXYGEN: Forms double Covalent Bond

Oxygen has six valence electrons  , hence short of two electrons to attain the stability of nearest noble gas Ne.

To attain stability double covalent bond is formed by sharing of four electrons between two oxygen atoms.

NITROGEN: Forms triple Covalent Bond

Nitrogen has five valence electrons , hence short of three electrons to attain the stability of nearest noble gas Ne.

To attain stability triple covalent bond is formed by sharing of four electrons between two oxygen atoms.

Conditions necessary for the formation of covalent bonds:

·         A bond formed by mutual sharing of electrons

·         Formed between two or more non-metals – difference in electro negativity should not be high.

·         A single bond represents 2 electrons

·         They satisfy the octet rule by sharing of electrons

·         These molecules have a definite shape

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