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Noufiya
Subject: Science
, asked on 23/2/18
Plz solve this:
Answer
2
Noufiya
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.
Answer
2
Hisham Hafeez
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
Answer
4
Esther
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) K
2
CO
3
(ii) Na
2
SO
4
(iii) Ca(HCO
3
)
2
(iv) H
2
S
Answer
2
Sneha Maity
Subject: Science
, asked on 20/2/18
Calculate the molar mass of S8.
Answer
2
Adyasha Soumya Routray
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.
Answer
1
Adyasha Soumya Routray
Subject: Science
, asked on 18/2/18
Find the no.of moles of 89g of sodium nitrate.
Answer
1
Triveni Sunil Bondre
Subject: Science
, asked on 17/2/18
Write difference between Na and Na+ in terms of their electronic configuration
Answer
4
Vaishnavi G
Subject: Science
, asked on 15/2/18
Answer it as fast as possible
Answer
3
Vaishnavi G
Subject: Science
, asked on 15/2/18
Can anyone please solve these two questions fast
Answer
1
Rishika
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.
Answer
3
Ambuj Agarwal
Subject: Science
, asked on 14/2/18
Plz ans.
Answer
2
Sambartak Ghosh
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 ?
Answer
3
Arham Jain
Subject: Science
, asked on 14/2/18
Advantages of using chemical formula
Answer
2
Garima Srivastava
Subject: Science
, asked on 14/2/18
Can a molecule be the smallest particle of an element (capable of independent existence)
Answer
2
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What are you looking for?
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.
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
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
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.
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.
Q10. The following data represents the distribution of electrons, protons and neutrons in atoms of four elements A, B, C, D.
B
C
D
17
17
18
18
20
22
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 ?