Fill in the blanks to make the statement correct. You must type the answer in exactly as it is in the word bank. If you type kinetic energy instead of KE it will be marked wrong. Before a ball is dropped, the ball has . When the ball falls, the ball then has GPE and KE. When the ball hits the surface, the ball transfers some of its to the surface before it bounces back up. If the surface the ball bounces on is , then most of the energy will not be absorbed because the molecules are close together.

Word Bank:

close together

friction

farther apart

KE

dense

not dense

GPE

GPE and KE

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).

he would use the colour black

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.