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Subject: Science, asked on 26/3/18

1) Define the following -
a) matter
b) atom
c) element
d) compounds
e) ion
f) cation
g) anion
h) metals
I) non-metals
j) molecule

Subject: Science, asked on 26/3/18

which one of the following is not a mixture
distilled water
lpg
sugar dissolved in water
gasoline

Subject: Science, asked on 25/3/18

Anybody can tell me the syllabus of science in each branch of class 9th.of you know then tell me plz.

Subject: Science, asked on 24/3/18

Q20???
Q.20. 5.6 litre of a gas at STP are found to have a mass of 22 g. The molecular mass of the gas is
(A) 22
(B) 44
(C) 88
(D) 33

Subject: Science, asked on 23/3/18

Solve this :

69. The normal boiling point of a liquid is 140oC. What will be the vapour pressure of the liquid at 140oC, in atm unit ?

Subject: Science, asked on 23/3/18

Please answer question 71

71.  An ideal gas exert 2 atm pressure in a 2 L container at 100 K. The gas is then transferred to a one litre container and the container was heated to 200 K. What will be the final pressure of the gas in atm unit ? 

Subject: Science, asked on 23/3/18

↵Please solve question 69

69. The normal boiling point of a liquid is 140°C. What will be the vapour pressure of the liquid at 140°C, in atm  unit? ​
 

Subject: Science, asked on 20/3/18

Q. How C+O2→CO2-94 k cal

Subject: Science, asked on 20/3/18


Q. Please name the polyatomic elements: O3, P4, S8
 

Subject: Science, asked on 20/3/18


Q. Name the following symbols(metalloids):
As, Sb, Se, Te, Ge.
 

Subject: Science, asked on 18/3/18

What is +dAdt and +dBdt?

Subject: Science, asked on 13/3/18

Rqni and her little sister wanted to go out to play while it was raining outside. But their mother prevented them from going out. Rani obeyed her mothers instruction and agreed to stay back home wireless latest starting crying in order to distress a little sister, rani took her to the window and started and started drawing pictures and smileys on the window, tiny droplets over it: -1) why do we see what the plates on the window. 2) comment on Rani behaviour.

Subject: Science, asked on 5/3/18

Solve this:

​Q22. While conducting the experiment to determine the boiling point of water. Students observed that temperature of the boiling water remains constant for long. Explain

Q23. Which chemical is used for staining onion peel cells during preparation of temporary mount of onion peel?

Q24. During the experiment on measurement of loss in weight of insoluble solid in tap water & salty water when will the maximum loss in weight be observed? Explain

Q25. After observing specimen of Cockroach, Shreya decided to place it in phylum arthropoda. Which two features did she observe that helped her to do so.

Subject: Science, asked on 27/2/18

Does burning of paper follow the law of definte proportions

Subject: Science, asked on 24/2/18

Experts please answer this question.
And please don't send any links...
Q. Why is ice at 273 K more effective in cooling than water at the same temperature?

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