Cho 1 cm3 dung dịch mực in phun chứa 2.105 hạt dạng hình cầu có đường kính 10-6 m. Tính bề mặt tổng của các hạt mực trong 200 cm3 dung dịch mực in nói trên.

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.

Which of these describes how heat is transferred by convection* a. sunlight travels through space without the aid of fluids or solids. b. warm air rises and takes the heat with it, eventually, it cools and sinks c. air at the equator rises and sinks at the poles. d. air molecules touch the warm ground, heating them up *not conduction