C2211❌ H7722❌ N1111✔️ O22213❌ Step 2: Multiply coefficients for compounds to balance out each element For each element that is not equal, try to balance it by adding more of it to the side with less. Sometimes there may be multiple compounds with that element on one s...
B.麻黄碱含有苯环、醇羟基,可以发生取代反应,含有苯环,可以发生加成反应;牛磺酸含有羟基、氨基,可以发生取代反应,B正确; C.麻黄碱含有醇羟基,可以与Na反应,但不能与NaOH发生反应,C错误; D.牛磺酸与HSCH2CH( NH2)COOH(半胱氨酸)结构不同,因此二者不能互为同系物,D错误; 故合理选项是B。反馈...
B.麻黄碱含有苯环、醇羟基,可以发生取代反应,含有苯环,可以发生加成反应;牛磺酸含有羟基、氨基,可以发生取代反应,B正确; C.麻黄碱含有醇羟基,可以与Na反应,但不能与NaOH发生反应,C错误; D.牛磺酸与HSCH2CH( NH2)COOH(半胱氨酸)结构不同,因此二者不能互为同系物,D错误; 故合理选项是B。练习...
PbSO4 + C2H7NO2 = Pb(C2H3O2)2 + (NH4)2SO4 C6H5ONa + Br2 = C6H2ONa(Br) + BrH CaCO3 + NaCI = CaCO3 + NaCI Ni + SO4 = Ni(SO4) NaOH + KBr = KOH + BrNa NaMnO4 + H2SO4 + H2S = Na2SO4 + MnSO4 + H2S + H2O 近期平衡的方程式練習...
H72❌ N11✔️ O25❌ We could not determine all the steps needed to balance the equation using trial and error. This may mean it requires too many steps and the chemical equation is too complex to use this method, or that the equation is invalid (e.g. has 0 or non-integ...
The law of conservation of mass states that matter cannot be created or destroyed, which means there must be the same number atoms at the end of a chemical reaction as at the beginning. To be balanced, every element in Ca(CH3COO)2 + (NH4)2CO3 = CaO + C...