Cho biết ý nghĩa các giá trị trong bảng kết quả chuẩn độ điện thế sau đây? V tại điểm tương đương là bao nhiêu? V (ml) E (mV) ∆E/∆V
24.10 183 110
24.20 194
24.30 233 390
24.40 316 830
24.50 340 240
24.60 351 110
24.70 358 70

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.