Which answer choice correctly describes a chemical bond? a force that holds atoms together in a fixed yet flexible structure a force that holds atoms together in a fixed and stationary structure a force that holds atoms together in a fixed and rigid structure a force that holds atoms together in a fixed yet linear structure

The correct answer is option A.

A chemical bond is a force that holds atoms together in a fixed yet flexible structure.  

Chemical bonds are a fixed structure as they are formed by sharing of electrons as in a covalent bond. Chemical bonds are also flexible as they are observed to vibrate by the use of advanced technology such as IR spectroscopy.  

According to IR spectroscopy chemical covalent bonds show stretching, rocking, wagging, twisting and scissoring movements.  

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied