Which is not a reason why the mass of an atom is expressed in atomic mass units rather than in grams? Scientists could not agree on a standard.

Atomic mass allows for mass differences in isotopes.

The mass in grams is too small to be useful.

Atomic mass units make it easier to compare the masses of atoms.

Consider two less-than-desirable options. in the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. in the second option you are driving 30 mph and crash head-on into a stationary brick wall. in neither case does your car bounce off the thing it hits, and the collision time is the same in both cases. which of these two situations would result in the greatest impact force?

How do you know how many valence electrons an atom has?

Aforklift raises a box above the floor and does 2,000 j of work. if the forklift motor consumes 3,000 j of electrical energy from the battery to raise the box, what is the efficiency of the lift?