A, số nguyên tử H để có cùng khối lượng với 1 nguyên tử A1

The boiling point of liquids is very high what does it indicate

Which position represents spring in the southern hemisphere? a) b) c) d)

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.