PLEASE HELP I NEED TO FINISH THIS TEST I HAVE 20 MINS HELP ASAP A ball rolling on a smooth horizontal floor strikes an identical ball and comes to a stop. The second ball starts moving at a speed slightly slower than that of the first ball before it came to a stop. A graph showing the kinetic energy of the first ball over time is shown
below.
Kinetic Energy Over Time
Kinetic Energy (1)
1-
0
Time (s)
Why did the first ball come to a stop on collision?
OA. Its kinetic energy was destroyed and permanently lost from the system during the collision.
ОВ.
Its kinetic energy was converted to thermal energy and the potential energy of the second ball during the collision.
OC. Its kinetic energy was completely lost to the surrounding environment as thermal energy during the collision.
D. Its kinetic energy was converted to thermal energy and the kinetic energy of the second ball during the collision.

what is the volume occupied by 40 grams of argon gas (ar) at standard conditions? what volume, in liters, is occupied by 1.5 x 1023 

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.