cho a (g) Zn tác dụng với H2SO4 loãng dư thu được 6.72 lít khí H2 điều kiện tiêu chuẩn và muối. Xác định giá trị a và tính khối lượng

Drug abuse will not lead to physical and psychological dependence. true or false ?

How do dying stars contribute to the formation of planets

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)