CHEMISTRY
What is Plasma ? How is it formed in stars ?
Why does a Neon sign bulb glows ?
Give a brief note on BEC.
Give the formula of dry ice.
(a) What is sublimitation ? Name two substances which undergo sublimation
(b) Draw a labelled diagram of the experimental setup to demonstrate
sublimation of Ammonium chloride.
Which property of cotton makes it suitable for use a clothing in summer?
You want to wear your favourite shirt to a party but the problem is that it is still wet
after a wash. What steps would you take to dry it faster?
Small quantities of water and ether are placed on palms of both the hands. Which
will experience more cooling?
Before an Injection, the nurse applies spirit at the site. How does one feel? and why
is it applied ?
Answers
Answer:
Plasma is one of the four fundamental states of matter, and was first described by chemist Irving Langmuir in the 1920s
Gases can become plasmas in several ways, but all include pumping the gas with energy. A spark in a gas will create a plasma. A hot gas passing through a big spark will turn the gas stream into a plasma that can be useful. ... Essentially, the sun, like most stars, is a great big ball of plasma.
A neon light contains a tiny amount of neon gas under low pressure. Electricity provides energy to strip electrons away from neon atoms, ionizing them. Ions are attracted to terminals of the lamp, completing the electric circuit. Light is produced when neon atoms gain enough energy to become excited.
Bose–Einstein condensate (BEC) is what happens to a dilute gas when it is made very cold, near absolute zero, i.e. 0 K (which equals −273 °C or −459.67 °F). It forms when the particles that make it up have very low energy. ... Superfluidity and superconductivity are both closely connected with the BEC state of matter.
Dry ice is solid carbon dioxide, with the formula CO₂.
Sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.
Aodine crystals.
Naphthalene (mothballs) Naphthalene
During summer, cotton clothes are preferred because cotton has good absorbance property. Therefore, when we sweat during summer's then cotton readily absorbs the moisture caused by sweating.
Wet clothes dry up by Evaporation process.
Steps would you should follow to dry the shirt faster are:
---> Allow the shirt to dry under a fan at high speed .
Reason: As wind speed increases, rate of EVAPORATION increases.
----> We can use hot iron for shirt .
Reason: As temperature increases rate of EVAPORATION increases.
---> If sunlight is available, spread out the shirt Such that surface area is more for drying in open area .
Reason: temperature and surface area increases rate of EVAPORATION increases.
Ether will create more cooling than water because ether is volatile while water is not. Being volatile in nature ether evaporates very quickly creating a cooling effect.
70% Isopropyl alchohol or ethanol is rubbed on the injection site to disinfect the skin so that the needle of the syringe does not drive in bacteria into the blood stream and cause septicemia or blood poisoning which may lead to septicemia and inflammation of the body, heart failure or loss of protein synthesis which causes blood to clot . It might cause acute lung problem also. The problems are so large that a little caution is very useful.
MARK AS BRAINLIEST PLEASE HAVE A GOOD DAY
Explanation:
I do not know much about it.....
plasma is a hot ionized gas consisting of approximately equal numbers of positively charged ions and negatively charged electrons. The characteristics of plasmas are significantly different from those of ordinary neutral gases so that plasmas are considered a distinct fourth state of matter