năng lượng hoạt hóa của một phản ứng khi không có chất xúc tác bằng 75,24kj/mol, cofn khi có chất xúc tác bằng 45,36kj/mol. Tính khi có mặt chất xúc tác thì ti\ốc đôh phản ứng tăng bao nhiêu lần nếu ở 20 độ

The wave shown on the electromagnetic spectrum disturb the medium it passes through a)different frequency. b)the same frequency .

Jose and eric were given four samples in lab. the results of their analysis are shown in the table. based on the data they collected, which sample is most likely a metal?

Which of the following is the correct definition of chemical energy? a. energy an object has because of its motion or position b. energy resulting from the flow of charged particles, such as electrons or ions c. energy produced from the splitting of atoms d. energy stored in chemical bonds of molecules