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Subject: Science, asked on 25/12/17

Solve this:

​Q4. (a) From Rutherford's o- particle scattering experiment give experimental evidence for deriving the conclusion that :

        (i) most of the space inside the atom is empty.

        (ii) the nucleate of an atom is positively charged.


      (b) What was the major drawback of Rutherford's atomic model?
 

Subject: Science, asked on 24/12/17

why does the mass number exclude the mass of an electron

Subject: Science, asked on 20/12/17

Why Ernest Rutherford got unexpected result from his experiment

Subject: Science, asked on 19/12/17

Why some elements show colours ?? Explain.

Subject: Science, asked on 6/12/17

How many moles are present in 9 grams of H2O

Subject: Science, asked on 5/12/17

all defination of structure of an atom

Subject: Science, asked on 25/11/17

Solve this:
 

Subject: Science, asked on 22/11/17

Pls ans all questions

Subject: Science, asked on 19/11/17

1. dash is used to treat cancer patieny
 

Subject: Science, asked on 13/11/17

Please help me with all these questions. It's very important. Iwant the answers. Please

​Q1. Write the Latin names and symbols of the following elements :- 
        Mercury, Iron, Copper, Antimony, Gold, Silver, Lead , Sodium , Potassium, T in and Tungsten 


Q2. Write the formula of the following compounds using valency and find the atomicity.
       a. Calcium Phosphate                   (f) Barium chloride
       b. Ammonium Nitrate                  (g) Magnesium Nitride
       c. Potassium lodide                       (h) zinc carbonate
      d. Sodium bicarbonate                    (i) Copper (II) Oxide 
      e. Aluminium Hydroxide                (j) Ferrous Sulphate

Q3. Calculate the formula mass of the following :

       a. (a) Al2(SO4)3               (b) ( NH4)2 CO3

Q4. On electrolysis 225 g of water gave 25 g of hydrogen and 200 g of oxygen. In another experiment when 10 g hydrogen gas was burnt with 80 g oxygen 90 g of water was formed. Show by calculation the validity of the law of constant proportion.

Q5. Calculate the percentage composition of each element in sulphuric acid.
       
     

Subject: Science, asked on 5/11/17

Solve q28 and give detailed explanation

Subject: Science, asked on 3/11/17

what are nucleons?
why were the shells named K,L,M,N and not A,B,C,D?

Subject: Science, asked on 1/11/17

an element l has 9 protons and its valency is 1 another element m has valency 3 and 5 what is the difference in the no of electrons in l and m ? give detailed explanation

Subject: Science, asked on 29/10/17

Explain the diagram of Rutherfords model of an atom with its observations and features

Subject: Science, asked on 29/10/17

how 8 electron are present in the outermost cell of :
  1. xe
  2. Kr
  3. He
  4. Ar
  5. Xenon
  6. Redon

pls help me in        all these as fast as possible...and please please  
 

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