Your roommate has learned that burning approximately 3,500 food calories (the food calorie is a quantity equal to a kilocalorie, kcal) results in a weight loss of 1 lbm, and he gets the bright idea of losing weight rapidly by eating ice.

his theory is that the energy expended by the body in melting the ice and raising the resulting liquid water to body temperature will do the trick.

you burst the poor boyâs bubble by telling him the amount of ice he would have to consume.

how much ice would be required per pound of weight lost?

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

you didnt put any of the following

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.