Though aluminium is a quite reactive metal it doesn’t react with the food.This is due to the presence of an inert aluminium oxide layer on its surface which if formed when an aluminium pot is produced, the surface is oxidized instantly (aluminium combine with the oxygen of air). This thin but strong layer prevents theContinue reading “Though aluminium is a quite reactive metal,the food in aluminium pot doesn’t react with the pot, why?”
Author Archives: Arjun Dhamala
If A+B+C=π then,Prove that: cos²A + cos²B + cos²C + 2 cosA . cosB . cosC = 1
Solution: Here,A + B + C = π then A+B=π-C B+C=π-A A+C=π-C Now, Let’s consider 2 cosA . cosB . cosC = cosA [2 cosB.cosC] =cosA[cos(B+C)+ cos(B- C)] =cosA [cos(180-A) + cos(B-C)] =cosA [-cosA + cos(B-C)] = -cos²A + cosA cos(B-C) = -cos²A + {2cosA cos(B-C)}/2 =-cos²A + {cos(A-B+C) + cos(A+B-C)}/ 2 = -cos²A +Continue reading “If A+B+C=π then,Prove that: cos²A + cos²B + cos²C + 2 cosA . cosB . cosC = 1”
Why is impure zinc preferred in the laboratory preparation of hydrogen gas?
We use impure granulated zinc over metallic zinc because granulated zinc has impurities of copper which acts as positive catalyst and increases the rate(speed) of reaction. Pure zinc reacts very slowly with dilute hydrochloric acid.
If A + B + C = π then Prove that: cos²A + cos²B – cos²C+ 2sinA.sinB.cosC=1
Solution: Here,A + B + C = π then B+C=π-A Now, Let’s consider 2 sinA . sinB . cosC = sinA [2 sinB.cosC] = sinA [sin(B+C) + sin(B-C)] =sinA[sin(180-A) + sin(B-C)] = sinA [sinA + sin(B-C)] = sin²A + sinA sin(B-C) = sin²A + {2sinA sin(B-C) }/ 2 = sin²A + {cos(A-B+C) – cos(A+B-C) }/Continue reading “If A + B + C = π then Prove that: cos²A + cos²B – cos²C+ 2sinA.sinB.cosC=1”
What is Sporophyte and gametophyte
A sporophyte is a multicellular diploid generation found in plants and algae that undergo alternation of generations. It produces haploid spores that develop into a gametophyte. The gametophyte then makes gametes that fuse and grow into a sporophyte. The gamete producing and usually haploid phase, producing the zygote from which the sporophyte arises(in the lifeContinue reading “What is Sporophyte and gametophyte”
What is oxyhydrogen flame? Why is it used?
Oxyhydrogen is a mixture of hydrogen and oxygen gases. This gaseous mixture is used for torches to process refractory materials and was the first gaseous mixture used for welding.Oxyhydrogen flame producing device:
A new quilt is warmer than an old one. Why?
A new quilt has air spaces between the layers of the woollen or cotton. These air spaces trap air and it acts as insulator(insulators are bad conductor of heat). They do not allow the body heat/temperature to escape out from body and keeps warm. however the old quilt, the layers of woolen press against eachContinue reading “A new quilt is warmer than an old one. Why?”
Steps for preparing a Research Proposal
There are different ways of preparing research proposals depending upon the various area. The following are the common steps to be adopted when a research proposal is prepared: 1.study other’s proposal related to your subject area 2.Read the literature related to your field of interest of making proposal 3.make shorting the subjects that touches yourContinue reading “Steps for preparing a Research Proposal”
My First Blog Post
Be yourself; Everyone else is already taken. — Oscar Wilde. This is the first post on my new blog. I’m just getting this new blog going, so stay tuned for more. Subscribe below to get notified when I post new updates.
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