PLS HELP Na2CO3 XH2O had the water removed, the initial mass of the hydrate was 343.43 g. After heating
the compound, the mass of the anhydrate was 127.19 g. Determine the degree of hydration​

Is a pencil falling to the floor anon contact force, a force, or a contact force

The diagram below shows the movement of particles. what does this piece of evidence best support? the collision theory the maxwell-boltzmann distribution the effect of pressure on reaction rates the effect of temperature on reaction rates

Which of the following is not true about the atomic model of substances?