The law of conservation of matter tells us that the total number of atoms does not change in a chemical reaction and thus mass is conserved. Select all of the reactions that obey the law of conservation of matter

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?

Aphoton is absorbed by an electron that is in the n = 3 state of a hydrogen atom, causing the hydrogen atom to become ionized. very far away from the nucleus, the released electron has a velocity of 750,000 m/s. what was the wavelength of the absorbed photon?

In a system with only a single force acting upon a body, what is the relationship between the change in kinetic energy and the work done by the force? answers: work is equal to the change in kinetic energy. work depends on the square of the change in potential energy. work is equal to the negative of the change in kinetic energy. work is equal to the square of the change in kinetic energy