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Sneha Roychowdhury
Subject: Science
, asked on 22/4/18
What happens in each case and which gas is present in the test tube ?
Answer
1
Sneha Roychowdhury
Subject: Science
, asked on 21/4/18
1. Identify the following reaction as endothermic and exothermic.
a
)
C
H
4
+
2
O
2
→
C
O
2
+
2
H
2
+
E
n
e
r
g
y
b
)
2
F
e
S
O
4
→
h
e
a
t
F
e
2
O
3
+
S
O
2
+
S
O
3
Answer
1
Anwesha
Subject: Science
, asked on 21/4/18
What is the physical significance cif mole?
Answer
2
Sneha Roychowdhury
Subject: Science
, asked on 20/4/18
Q. What is atm here ?
C
O
(
g
)
+
2
H
2
(
g
)
→
340
a
t
m
C
H
3
O
H
(
1
)
Answer
2
Sneha Roychowdhury
Subject: Science
, asked on 20/4/18
W
h
a
t
i
s
t
h
e
o
b
s
e
r
v
a
t
i
o
n
i
n
t
h
e
g
i
v
e
n
a
c
t
i
v
i
t
y
?
Answer
2
Sneha Roychowdhury
Subject: Science
, asked on 20/4/18
Please answer to the question given below and why ?
Q. Perform the following activity.
* Take four beakers and label them as A, B, C and D.
* Put 25 mL of water in A, B and C beakers and copper sulphate solution in beaker D.
* Measure and record the temperature of each liquid contained in the beakers above.
* Add two spatulas of potassium sulphate, ammonium nitrate, anhydrous copper sulphate and fine iron fillings to beakers A , B, C and D respectively and stir.
* Finally measure and record the temperature of each of the mixture above.
Find out which reactions are exothermic and which ones endothermic in nature.
Answer
2
Sneha Roychowdhury
Subject: Science
, asked on 20/4/18
Please answer to this question with the explanations .
Q). Take about 2 g barium hydroxide in a test tube. Add 1 g of ammonium chloride and mix with the help of a glass rod. Touch the bottom of the test tube with your palm. What do you feel? Is this an exothermic or endothermic reaction?
Answer
1
Sneha Roychowdhury
Subject: Science
, asked on 20/4/18
Q). What is the observation with the chemical reaction ?
Take lead nitrate solution tn a test tube.
Add potassiurn iodide solution to this.
What do you observe?
Answer
1
Joyy Goswami
Subject: Science
, asked on 18/4/18
S + O2 → SO2
In the above reaction oxygen is written as O2 because it is diatomic.
But why sulphur is written as S not S8 because atomicity of sulphur is 8?
Answer
1
Joyy Goswami
Subject: Science
, asked on 18/4/18
2Ag + H2S ? Ag2S+H2. what type of reaction is this
(i)If the above reaction is a displacement reation then how Silver(Ag) a less reactive element displaces Hydrogen(H) a more reactive element? (ii)Are there any other examples of reactions in which a less reactive element displaces a more reactive element?
Answer
1
Sneha Roychowdhury
Subject: Science
, asked on 18/4/18
Differentiate between combination reaction and decomposition reaction .Write the chemical equations for the reactions .
Answer
1
Joyy Goswami
Subject: Science
, asked on 18/4/18
2Ag + H2S ? Ag2S + H2. What type of reaction is this?
Answer
2
Prithika
Subject: Science
, asked on 18/4/18
Whats the diff between a dilute solution and an aqueous solution?
Answer
2
Apoorva S Viswanath
Subject: Science
, asked on 17/4/18
What is NO2?
Answer
3
Akanksha Prasad
Subject: Science
, asked on 15/4/18
i have attended live class of physics chemistry and biology still my attendance is 1/10 how can it be
Answer
4
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What are you looking for?
Q. Perform the following activity.
* Take four beakers and label them as A, B, C and D.
* Put 25 mL of water in A, B and C beakers and copper sulphate solution in beaker D.
* Measure and record the temperature of each liquid contained in the beakers above.
* Add two spatulas of potassium sulphate, ammonium nitrate, anhydrous copper sulphate and fine iron fillings to beakers A , B, C and D respectively and stir.
* Finally measure and record the temperature of each of the mixture above.
Find out which reactions are exothermic and which ones endothermic in nature.
Q). Take about 2 g barium hydroxide in a test tube. Add 1 g of ammonium chloride and mix with the help of a glass rod. Touch the bottom of the test tube with your palm. What do you feel? Is this an exothermic or endothermic reaction?
In the above reaction oxygen is written as O2 because it is diatomic.
But why sulphur is written as S not S8 because atomicity of sulphur is 8?
(i)If the above reaction is a displacement reation then how Silver(Ag) a less reactive element displaces Hydrogen(H) a more reactive element? (ii)Are there any other examples of reactions in which a less reactive element displaces a more reactive element?