Select all that apply. Why are mixtures (such as sugar in water) not given chemical formulas? (Multi answers)

1No chemical bonding took place.

2Mixtures do not contain compounds.

3The elements or compounds in the mixtures have no definite proportions.

4Their elements are unknown.

d) physical means can be used to separate the components of air.

i think the answer is a and b

i wish you luck

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me