Câu 2. Trong phòng thí nghiệm có: H2SO4 đặc, Cu, nuwóc cất, dụng cụ và điều kiện thí nghiệm có đủ. Trình bày thí nghiệm : Cu tác dụng với H2SO4 đặc và H2SO4 loãng. Nêu hiện tuwọng xảy ra, viết phuwong trình phản ứng.

The crust of earth may a- continets and ocean floors. b-continents only. c-layers of sedimentary rocks and continents. d-all of the above

Match the following vocabulary terms to their definitions. 1. amount of energy required to change 1 gram of material from the solid to the liquid state at its melting point 2. a measure of the kinetic energy of the particles of a substance 3. the amount of heat energy required to raise the temperature of 1 gram of liquid water from 14.5°c to 15.5°c 4. amount of energy required to change 1 gram of material from the liquid to the gaseous state at its boiling point 5. the amount of energy required to change 1 gram of a substance 1°c a. temperature b. latent heat of vaporization c. latent heat of fusion d. calorie e. specific heat

Using data from seismic waves, geologists have learned that earth’s interior is made up of several