Jordon put 30.0 g of ice into a refrigerator. The temperature dropped from -30.0°C to 45.0°C. How many joules of heat were lost?

Schrodinger and heisenberg developed an alternate theory about atomic nature that contradicted some of bohr's model of the atom. how do changes resulting from new technology and evidence affect the reputation of the atomic theory?

In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom?

How does concentration affect reaction rate