What number should be placed in front of KBr to balance this chemical equation? Br2 + 2K] → __KBr + 12 O A. 3
B2
C. 1
D. 4​

A2 kg ball travellng to the right with a speed of 4 m/s collidees with a 5 kg ball traveling to the left with a speed of 3 m/s. take right to be the positive direction. what is the total momentum of the two balls before they collide? what is the total momentum of the two balls after they collide?

How many dots must be added to the symbol to properly represent a standard nitrogen ion? a) 1 b) 3 c) 5 d) 8

Around faucet handle is part of a(n) a. lever b. screw c. inclined plane d. wheel and axle