keshav chemical eqation and reaction

ACTIVITY: TO SHOW THE BURNING OF MAGNESIUM RIBBON

* Material required:

 1) Magnesium ribbon

 2) Sand paper

  3) Matchbox 

* METHOD: 

 1) Rub the magnesium ribbon with sand paper to remove the layer of magnesium oxide

  2)  Burn the magnesium ribbon.

*  OBSERVATION:  the ribbon burn with dazzling white light 

* CONCLUSION: the white powdery product formed is magnesium oxide.

 IN  THE FORM OF CHEMICAL EQUATION:

   2  Mg (s)  +  O₂ (g)  →  2 MgO (s

sakshi roll no. 13 chemical equations

 date: 21/06/17

               chemical equation and reactions

ACTIVITY: TO SHOW THE BURNING OF MAGNESIUM RIBBON

* Material required:

 1) Magnesium ribbon

 2) Sand paper

  3) Matchbox 

* METHOD: 

 1) Rub the magnesium ribbon with sand paper to remove the layer of magnesium oxide

  2)  Burn the magnesium ribbon.

*  OBSERVATION:  the ribbon burn with dazzling white light 

* CONCLUSION: the white powdery product formed is magnesium oxide.

 IN  THE FORM OF CHEMICAL EQUATION:

   2  Mg (s)  +  O₂ (g)  →  2 MgO (s)

VAISHNAVI - Chemical Reactions​ & Equations

CHEMICAL REACTIONS AND EQUATIONS

                                            21/6/17

Activity on magnesium ribbon:

Materials required: magnesium ribbon ,
                                    matchbox,
                                    candles or burner

Procedure:

             Clean a magnesium ribbon by rubbing with a sand paper so that the carbonate gets removed from the surface of the magnesium ribbon. Now burn it with a candle or with a burner, we observe the magnesium ribbon burns in air with a dazzling flame and changes into white powder. The powder is formed due to the reaction between magnesium and oxygen.

It can be expressed as :   2Mg + O₂ ­­­­-------->  2MgO

mumtaz

Chemical

reactions and equation.
Acitivity : to show the burning of magnesium is a chemical change

When a magnesium ribbon is heated ,it burns in air with a dazzling white falme to form a white powder called magnesium oxide. Actually , on heating , magnesium combines with oxygen present in air to form magnesium oxide:
         Magnesium   +   oxygen  ~heat   ~ magnesium oxide
The burning of magnesium in air to form magnesium oxide is an example of a chemical reaction.so,before burning in air ,the magnesium ribbon is cleared by rubbing with a sand paper. This is done to remove the protective layers of basic magnesium carbonate from the surface of magnesium ribbon.

ayush sharma roll no -28

Chemical Reaction and Equations

21-06-2017
Experiment with Magnesium Ribbon

Material: Magnesium Ribbon, Candle, Matches
Objective: To observe the reaction of Magnesium with Air.
Process: First take a magnesium ribbon and rub it with sandpaper so the layer of carbonate gets removed from the surface of magnesium.
Now burn the candle and take the magnesium ribbon near the flame and hold it there for some time and then you will witness that the magnesium ribbon burns with a dazzling white flame and after it is completely burnt you will that only ash remains.
We can write the chemical equation as:-
2Mg + O2 ­­­­-------->  2MgO

Aarush Sinha --- Roll NO. 22 ----- Chemical Reactions and equations

Chemical Reaction and Equations

21-06-2017

Experiment with Magnesium Ribbon

Material: Magnesium Ribbon, Candle, Matches

Objective: To observe the reaction of Magnesium with Air.

Process: First take a magnesium ribbon and rub it with sandpaper so the layer of carbonate gets removed from the surface of magnesium.

Now burn the candle and take the magnesium ribbon near the flame and hold it there for some time and then you will witness that the magnesium ribbon burns with a dazzling white flame and after it is completely burnt you will that only ash remains.

We can write the chemical equation as:-

2Mg + O₂ ­­­­-------->  2MgO

TANISH KUMAR XA ROLL NO.46

                               19/4/2017

                                                 LIFE PROCCESES


Q1) Difference between Starch and Sugar?
Ans) Both Starch and Sugar are the form of carbohydrates, the only difference in both of these are that sugar are simple carbohydrtaes while starch are the complex carbohydrates.

Q2) What is the function of salivary amylase?
Ans) Fuction of Salivary amylase is to digest carbohydrates from the food and the name suggest it is present in the mouth in our saliva.

Q3) What is the Ph level of our mouth?
Ans) The Ph level in our mouth is around 6.75 to 7.25.

Q4) What is the function of HCl, Mucus, and Gastric Juice secreted in Stomach?
Ans) HCl is used to digest the proteins with the help of gastric Juice in the bolus.
         Mucus protects the kining of stomach which can be damaged by the action of gastric juices.
        Gastric Juice secrets a important component like inactivated pepsin which is activated by the                action of HCl and therefore leds to digestion of proteins from the food material.
1.Draw a well labelled diagram of ingestion in Amoeba.

2.what happens in a Calvin cycle of photosynthesis ?
In the Calvin cycle the energized electrons from the light dependent reaction provides th energy to form carbohydrates from the carbon dioxide molecules.
Is is called Calvin cycle because of the cyclical nature of the process.
3.Draw a well labelled diagram of digestive system.

  

       Diagram of digestive system

4.What is the function of salivary amylase, lipase,pepsin ?

Salivary amylase is an enzyme responsible for the breaking down of starch.

Pepsin us an enzyme that breks down protein into smaller peptdes (that is peptease)

Lipase is an enzyme that breaks down dietary fats into smaller molecules called fatt acids and glycerol.

5.what is the function of H.C.L

H.C.L kills the germs.

H.C.L makes the medium acidc for the action of the enzyme pepsin whixh works in the acidix medium.

ayush sharma roll no -28

LIFE PROCESSES                                
19/4/2017
Q1. Define life processes and name them.
Ans- The different processes which are performed by living organisms to maintain their life on earth , those processes are termed as life processes.

Following are the processes-

1. Ingestion
2. Digestion
3. Absorption
4. Assimilation
5. Excretion

Q2. Why is nutrition , respiration, transportation and excretion necessary?
Ans - These processes are necessary because -
 Digestion - This is a vital process which helps the living organisms to obtain energy.
 Respiration- It helps in exchange of gases.
 Transportation- It is important because it transports food to whole body via blood .
 Excretion- It is important as it helps to remove the undigested and toxic substances from the body.

HUMAN DIGESTIVE SYSTEM



Mouth- It includes-

1. Teeth- They help in chewing and mastication of food.
2. Tongue- Mixes the food along with saliva.
3. Salivary glands- It secretes saliva.

Oesophagus- Transports food from mouth to stomach by peristaltic movement.

• Types of teeth- There are 4 types of teeth-
• Molars- grinding of food
• Premolars- grinding of food
•  Canines- tearing
• Incisors- biting

 NUTRITION IN AMOEBA
Habitat- Aquatic
Structure- Unicellular without a definite shape and is controlled by nucleus.

Mode of nutrition- Holozoic mode of nutrition



22.04.2017

Homework

Q1. Where does the dark reaction takes place in the plants?
Ans- The dark reaction takes place in the stroma .

Q2. What is grana ?
Ans- Grana are many thylakoids in the chloroplast which is a organelle present in plants.

Homework
28.04.2017

Q1. Difference between starch and sugar.
Ans- Starch- They are hundreds of sugar molecule linked together i.e it is a complex carbohydrate.
Sugar- It is a simple molecule and a fast acting carbohydrate.

Q2. What is the function of salivary amylase?
Ans- It is a enzyme responsible for breakdown of starch into carbohydrates.

1. Q3. What is the pH of mouth?
2. Ans- The pH of mouth is 6.8.

Q4. What is the function of Hcl , mucus and secreted in the stomach?
 Ans- The function of Hcl is -

1. It kills ingested bacteria.
2. It provides acidic medium for protein digestion.
3. It splits nucleoproteins into nucleic acids and proteins.

Functions of mucus-
Its purpose is to coat the passageways of the nose, throat , sinuses and keeping them from becoming dry.


-

bhaskar tiwari xa 29

IFE LIFE PROCESS.

1.Draw a well labelled diagram of ingestion in Amoeba.

2.what happens in a Calvin cycle of photosynthesis ?
In the Calvin cycle the energized electrons from the light dependent reaction provides th energy to form carbohydrates from the carbon dioxide molecules.
Is is called Calvin cycle because of the cyclical nature of the process.
3.Draw a well labelled diagram of digestive system.

  

       Diagram of digestive system

4.What is the function of salivary amylase, lipase,pepsin ?

Salivary amylase is an enzyme responsible for the breaking down of starch.

Pepsin us an enzyme that breks down protein into smaller peptdes (that is peptease)

Lipase is an enzyme that breaks down dietary fats into smaller molecules called fatt acids and glycerol.

5.what is the function of H.C.L

H.C.L kills the germs.

H.C.L makes the medium acidc for the action of the enzyme pepsin whixh works in the acidix medium.

bhaskar tiwari xa rolll 29