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saurav
Questions (25)
Why are the trunks of fruit trees painted with a mixture of copper sulphate and calcium hydroxide
2 answers
558 views
show that :
sin(A+B).sin(A-B)=Cos^2B - Cos^2A =sin^2A - sin^2B
4 answers
517 views
20 men can do a piece of work in 24 days. After working for 6 days, additional men are employed to finish the work in 21 days
1 answer
755 views
25 % of a class of 40 students are girls. When some new girls joined the class, the percentage of girls increased to 40 %. How
1 answer
791 views
When a mixture of two black powders is heated, it gave off a gas which turned lime water milky
Give a chemical equation to show
2 answers
613 views
A straight line passes through the point (-1,2) and its distance from the origin is 1 unit. Find the equation
1 answer
919 views
p and q are two points on the line x - y + 1 = 0 such that each of them is 5 units far from the origin. Find the co-ordinates of
1 answer
551 views
If the point (a,0) and (0,b) and (1,1) lie on the same line, prove that 1/a + 1/b=1
1 answer
438 views
How to test calcium nitride.? ( ca3n2)
when calcium reacts with nitrogen , Calcium nitride is formed. How can we test that the
6 answers
1,256 views
How can you test calcium nitride.. ( Ca3N2)
I have written the reaction between calcium and nitrogen. A question that says " how
1 answer
660 views
Define buoyancy.state the factors on which buoyant force depends?
2 answers
916 views
Give five reasons to prove that labio rohita (rohu) is a chordate.
0 answers
517 views
'classification of life forms is closely related to their evolution'.justify this statment with the help of examples.
0 answers
497 views
With the help of a labeled diagram describe in brief the rutherford's alpha particle scattering experment. Write three important
1 answer
551 views
In a water tank,on throwing a stone 20 full ripples are produced in 1 sec.the distance a crest and a through is 10 cm.calculate:
3 answers
638 views
A loboratory uses an ultrasonic-scanner to trance tumar in tissue. The operting frequency of the 6 scanner is 4.2*10
1 answer
498 views
Define the following and give sl unit each:
(a) power (b) work done (c) kinetic energy
0 answers
442 views
Shubham lives in avillage,where drinking water facilites are very limited.they collect drinking water from a pond people also
0 answers
614 views
In a chemical reaction,10.g of sodium carbonate reacted with 12 g of ethanoic acid.the poducts were 4.4g carbon dioxide,1.8g of
0 answers
602 views
Istopes are useful in many ways.write any three applications of istopes in various fields.
0 answers
534 views
States the laws of reflection of sound and its two applications.
0 answers
552 views
Number of electrons in the outermost m shell of an element is 3.find its atomic number.
0 answers
535 views
A sample of certain mass of a gas was collected and it was found that the number of atoms and the nuber of molecules in the
0 answers
622 views
A sample of certain mass of a gas was collected and it was fond that the number of atoms and the number of molecules in the
1 answer
582 views
A solid of relative density 1.25 is found to weigh 12 g in water.find its weight in air.
1 answer
601 views
Answers (17)
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can we do it this way : keep the mixture at less than 100 degree C , then the steam will condense into liquid water and co2 stays as gas
ok. what do we need to do after both of the gases have been liquified???
what is the process of separation?
are these correct @DrBOb222 and @Steve 1) NaCl(aq) + AgNO3(aq) �¨ AgCl(s) + NaNO3(aq) 2) CaCl2(aq) + Na2CO3 (aq) �¨ CaCO3(s) + 2NaCl(aq) 3) K2SO4(aq) + Ba(NO3)2 (aq) �¨ BaSO4(s) + 2KNO3(aq) 4) Sr(NO3)2 (aq) + 2NaOH(aq) �¨ Sr(OH)2(s) + 2NaNO3(aq)
oh yeas. sorry for the turmoil
thank you . but what about the 3rd part of the question ? sin^2A - sin^2B what do we need to do with it?
behaviour African elephant societies are arranged around family units. Each family unit is made up of around ten closely related females and their calves and is led by an older female known as the matriarch.[3] When separate family units bond, they form
1) We use the for a particular reason. It is used for a definite purpose. 2)We use a in front of consonants. It is used to denote singular nouns. SUppose. " a student , a bright child.. " etc 3) AN - We use it in front of vowels. a e i o u . however,
Thank you sir for that.But how do we prove that the product formed is calcium nitride. I didn't get that..
Sorry sir , But I didn't get you. I am just a 9th grade student and don't know about empirical formula and all. Can you just tell me sir what I need to do. please sir
Hey thank you.. Dr.Bob222 Sir . Can we do it like this : take calcium nitride in a beaker and add water. When water reacts with calcium nitride, Calcium hydroxide and ammonia gas is formed. Ammonia is collected by the upward delivery of air. Ammonia has a
here, x1 = - 1 y1 = 3 x2= - 4 y2 = 2 Vector AB= ( x2 - x1 y2 - y1) =(-4 + 1 2 - 3) =(- 3, - 1 ) x. component = - 3 , y component = - 1 magnitude = root under (x comp)2 + (y comp)2 = root under 9 +1 = root 10 units Help me with chemistry please if you can .
I don't konw plzz help
I don't now
its five... let the points be abc, put "a" anywhere. you can place b at diametrically opposite or not (1/2) then if they are not diametrical opposite then there are two sides where we can place c.and one gives acute and other gives obtuse... so 1/2 so
