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Subject: Science, asked on 23/2/18

Plz solve this:
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Subject: Science, asked on 23/2/18

Plz answer these 5 questions:

5. Identify the state the type of transformation of energy in the following case:
(a) When a dry cell discharges.
(b) In a hydroelectric power plant. 

Subject: Science, asked on 22/2/18

Please Answer all the Answer, Experts
1)a. Which among the following has more number of molecules :
     1g of hydrogen (H2) or 1g of methane (CH?4) ? (Atomic mass of H = 1u, C = 12u)
b. Calculate the number of particles in 46g of Na atoms. (Atomic mass of Na = 23u)
c.Write the names of the compounds represented by the following formulae: 
      (i) Na2S (ii) (NH4)2CO3
d. Write the chemical formula of :
(i) Magnesium hydroxide (ii) Aluminium chloride​​

Subject: Science, asked on 21/2/18

Solve this:
17. (a) Define Molar mass. What are its units?
(b) Write the names of compounds represented by the following formulas:
(i) K2CO3       (ii) Na2SO4        (iii) Ca(HCO3)2     (iv) H2S

Subject: Science, asked on 20/2/18

Calculate the molar mass of S8.

Subject: Science, asked on 18/2/18

Solve this :

5. The atomic mass of element 39 No. of neutrons is 20. 
(i) Find the valence cell electron and valency of atom.
(ii) Represent the electric configuration of it.
(iii) When the same metal reacts with non-metal like chlorine. Write the molecular formulae.

Subject: Science, asked on 18/2/18

Find the no.of moles of 89g of sodium nitrate.

Subject: Science, asked on 17/2/18

Write difference between Na and Na+ in terms of their electronic configuration

Subject: Science, asked on 15/2/18

Answer it as fast as possible

Subject: Science, asked on 15/2/18

Can anyone please solve these two questions fast

Subject: Science, asked on 15/2/18

Solve this:
Q.a. Calculate the no. of particles in 64 g of oxygen gas.
Q.b. Calculate the mass of 0.5 moles of sodium atoms.
Q.c. Calculate the no. of particles in 112 g of iron.

Subject: Science, asked on 14/2/18

Plz ans.

Subject: Science, asked on 14/2/18

Solve this:

Q10. The following data represents the distribution of electrons, protons and neutrons in atoms of four elements A, B, C, D.
       
  Element     Protons   Neutrons    Electrons
    A
    B
    C
    D		      19
     17
     17
     18		      21
     18
     20
     22		      19
     17
     17
     18

   Answer the following questions :-

   (i) Describe the electronic distribution in atom of element B.

   (ii) Is elements B a metal or a now-metal ? Why ?
 

Subject: Science, asked on 14/2/18

Advantages of using chemical formula

Subject: Science, asked on 14/2/18

Can a molecule be the smallest particle of an element (capable of independent existence)

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