HELP ASAPP!!! 4.) If you change the 2 in front of 2O2 to a 3, what will be the change in the results on the right side of the equation?
A.) There are now 3CO2 molecules
B.) Nothing changes in the equation
C.) There is an extra O2 molecule left over
D.) There are now 3H2O molecules

5.) Which procedure could be used to demonstrate that matter is conversed during a physical change?
A.) Find the mass of a cup of water. Boil the water. Find the mass of the water that remains.
B.)Find the mass of a raw egg. Cook the egg. Find the mass of the cooked egg.
C.) Find the mass of a piece of ice. Let the ice melt. Find the mass of the liquid water.
D.) Find the mass of an apple. Cut the apple and remove the core. Find the mass of the remaining apple.

6.) One molecule of bromine (Br2) and two molecules of potassium chloride (KCI) combine in a reaction. How many atoms are in the products?
A.) three
B.) six
C.) four
D.) two

russian is not my first language, so i'm afraid i can't write out an answer in russian, but hopefully you can find a way to do so. here's my best translation of the problem: you're given a plot of a particle's position in one-dimensional space over time, and you're asked to find either the total distance traveled by the particle after 6 seconds had elapsed, or the total displacement of the particle after 6 seconds.

if you want the total distance traveled, you would first need to determine the particle's velocity as a function of time, then integrate that over the 6-second interval. we know the position function is quadratic with roots at 0 and 6, so we have

where is unknown. because the position is parabolic, there is symmetry about the midpoint at , and we know that

so that the position function is

which means the velocity is

then the total distance traveled is

so the total distance traveled is 20 m.

on the other hand, if you want to find displacement: the particle starts at and ends at , so its displacement is 0.

answer: 31, 5556. 952 seconds

at right angles to each other