Which best describes the illustration below?

a pure substance made of a compound

a pure substance made of an element

a mixture made up of different compounds

a mixture made up of different elements

How can you use chemical equations to predict the products of the reaction you can carry out?

If you add 10ml of hot water to 10ml of cold water and the change in tempature 8°c calculate how much energy is gained by the cold water

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?