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Theodore Delacroix
Subject: Science
, asked on 24/2/18
Value based question:
Sanah is student of class IX who is drummer in her school band. All the members of school band wanted to create some special effect on the stage. Sanah came up with the idea of creating a "fog effect" on the stage during the performance of her band. She asked one of her classmates to put a white solid brick with her hand gloves on in a bucket of warm water kept on one side of the stage. As soon as this was done, there was a dense white fog on the stage and all the performers appeared to float in. This fog created a magical environment on the stage. Everyone congratulated Sanah for this wonderful feat.
a) What is fog?
b) What was the white solid used to create artificial fog on the stage?
c) What is the special property of the above white solid which is used to create that effect?
d) What is the purpose of putting the white solid in warm water?
e) How does this white solid produce the tog effect on stage?
f) What are the values displayed by Sanah?
Answer
1
Noufiya
Subject: Science
, asked on 23/2/18
a) Define latent heat of fusion.
b)Why is ice at 273k more effective in cooling than water of same temperature. Explain.
c)How is kinetic energy of a substance can be increased.
d)Why do ice (solid substance) floats in water. Explain.
Answer
4
Harshit Singh Avengers
Subject: Science
, asked on 23/2/18
What is Brownian motion ?
Answer
1
Hisham Hafeez
Subject: Science
, asked on 22/2/18
1) (i) Wax is heated in a china dish. How is the following change during heating ?
a. Kinetic energy of the particle.
b. Intermolecular distance.
(ii) Comment on the following statements.
a. Rate of evaporation of an aqueous solution decreases with increase in humidity.
b. A gas fills the vessel completely in which it is kept.
2) (i) Which Separation technique you will apply for the separation of the following mixtures?
a. Camphor from Sand
b. Metal pieces from the engine oil of a car.
(ii)State the difference between a pure substance and a mixture. Give one example for each.
3) (i)a. Name the technique used to separate pigments from natural Colours.
b. Write the principle of that technique.
(ii) State two reasons to support that water is a compound.
4) During the separation of sand, common salt and NH
4
Cl, if in the first step the three has been dissolved in water, what would have been the difficulty in separation ?
Answer
2
Hisham Hafeez
Subject: Science
, asked on 22/2/18
1) (i) Wax is heated in a china dish. How is the following change during heating ?
a. Kinetic energy of the particle.
b. Intermolecular distance.
(ii) Comment on the following statements.
a. Rate of evaporation of an aqueous solution decreases with increase in humidity.
b. A gas fills the vessel completely in which it is kept.
2) (i) Which Separation technique you will apply for the separation of the following mixtures?
a. Camphor from Sand
b. Metal pieces from the engine oil of a car.
(ii)State the difference between a pure substance and a mixture. Give one example for each.
3) (i)a. Name the technique used to separate pigments from natural Colours.
b. Write the principle of that technique.
(ii) State two reasons to support that water is a compound.
4) During the separation of sand, common salt and NH
4
Cl, if in the first step the three has been dissolved in water, what would have been the difficulty in separation ?
5) While doing an experiment to determine boiling point of water, a student heated water in a beaker and observed that when the water starts boiling the temperature remains constant. State the reason. Where does the heat heat go?
Expert plz answer ASAP!!!
Answer
1
Kanika Gupta
Subject: Science
, asked on 17/2/18
what is sublimate? explain with example
?
Answer
3
Dhruv Malhotra
Subject: Science
, asked on 17/2/18
What is the meaning of refinery pose .
Answer
2
Nilesh Chandra
Subject: Science
, asked on 14/2/18
what is the brown substance appearing on iron nail after reaction
Answer
1
Garima Srivastava
Subject: Science
, asked on 13/2/18
Why is wood a pure substance
Answer
2
Garima Srivastava
Subject: Science
, asked on 13/2/18
A solution contains 25 gram of salt in 6250 ml of water calculate the concentration of mass by volume percent
Answer
1
Garima Srivastava
Subject: Science
, asked on 13/2/18
Arrange solution, suspension and colloid on the basis of their stability in ascending order.
Answer
3
Ebin Joe
Subject: Science
, asked on 8/2/18
Q. Calculate the kinetic energy of a car of mass 750 kg moving with a velocity of 54 kmh? Find the new kinetic energy of the car if a passenger of mass 50 kg sits in the car.
Answer
7
Dhriti
Subject: Science
, asked on 8/2/18
explain.all the seperation methods
Answer
2
Vedika
Subject: Science
, asked on 7/2/18
if 80 g of nacl is added to 640 g of water. find the concentration
Answer
2
Vijaya Kowstubha T
Subject: Science
, asked on 7/2/18
whay does 5%of salt mean?
Answer
1
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What are you looking for?
Sanah is student of class IX who is drummer in her school band. All the members of school band wanted to create some special effect on the stage. Sanah came up with the idea of creating a "fog effect" on the stage during the performance of her band. She asked one of her classmates to put a white solid brick with her hand gloves on in a bucket of warm water kept on one side of the stage. As soon as this was done, there was a dense white fog on the stage and all the performers appeared to float in. This fog created a magical environment on the stage. Everyone congratulated Sanah for this wonderful feat.
a) What is fog?
b) What was the white solid used to create artificial fog on the stage?
c) What is the special property of the above white solid which is used to create that effect?
d) What is the purpose of putting the white solid in warm water?
e) How does this white solid produce the tog effect on stage?
f) What are the values displayed by Sanah?
b)Why is ice at 273k more effective in cooling than water of same temperature. Explain.
c)How is kinetic energy of a substance can be increased.
d)Why do ice (solid substance) floats in water. Explain.
a. Kinetic energy of the particle.
b. Intermolecular distance.
(ii) Comment on the following statements.
a. Rate of evaporation of an aqueous solution decreases with increase in humidity.
b. A gas fills the vessel completely in which it is kept.
2) (i) Which Separation technique you will apply for the separation of the following mixtures?
a. Camphor from Sand
b. Metal pieces from the engine oil of a car.
(ii)State the difference between a pure substance and a mixture. Give one example for each.
3) (i)a. Name the technique used to separate pigments from natural Colours.
b. Write the principle of that technique.
(ii) State two reasons to support that water is a compound.
4) During the separation of sand, common salt and NH4Cl, if in the first step the three has been dissolved in water, what would have been the difficulty in separation ?
a. Kinetic energy of the particle.
b. Intermolecular distance.
(ii) Comment on the following statements.
a. Rate of evaporation of an aqueous solution decreases with increase in humidity.
b. A gas fills the vessel completely in which it is kept.
2) (i) Which Separation technique you will apply for the separation of the following mixtures?
a. Camphor from Sand
b. Metal pieces from the engine oil of a car.
(ii)State the difference between a pure substance and a mixture. Give one example for each.
3) (i)a. Name the technique used to separate pigments from natural Colours.
b. Write the principle of that technique.
(ii) State two reasons to support that water is a compound.
4) During the separation of sand, common salt and NH4Cl, if in the first step the three has been dissolved in water, what would have been the difficulty in separation ?
5) While doing an experiment to determine boiling point of water, a student heated water in a beaker and observed that when the water starts boiling the temperature remains constant. State the reason. Where does the heat heat go?
Expert plz answer ASAP!!!