Hòa tan 13g Kẽm vào 400g dung dịch HCl a) Tính thể tích H2 thu được ở đktc b) Tính nồng độ phần trăm C% của HCl ban đầu

The grooves or folds of the brain are called

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?

8) warming your hands by a fire is an example if which heat transfer? a. conduction b. convection c. radiation d. none of these