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what does conserving mass mean in a chemical equation?

1) there is an equal number of each type of atom on the reactant and product side.
2) there is an unequal number of each type of atom on both sides of the equation.
3) there are more of each type of atom on the product side than on the reactant side.
4) there are more of each type of atom on the reactant side than on the product side.

the answer is c i did the same question so i know that's right!

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.