Which balanced equation represents an oxidation-reduction reaction? (1) Ba(NO3)2 + Na2SO4 → BaSO4 + 2NaNO3
(2) H3PO4 + 3KOH → K3PO4 + 3H2O
(3) Fe + S → FeS
(4) NH3 + HCl → NH4Cl

When 225mg of anthracene, c14h10(s), was burned in a bomb calorimeter the temperature rose by 1.75k. calculate the calorimeter constant. by how much will the temperature rise when 125mg of phenol, c6h5oh(s), is burned in the calorimeter under the same conditions? (δch< (c14h10,s)=–7061 kj mol−1.)

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?

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.