题目
题目

MCD1170 - T1 - 2025 Revision Quiz

匹配题

Describe the correct order of steps required to balance a chemical equation (1.6.4) 1: Step 1 ____ 2: Step 2 ____ 3: Step 3 ____ 4: Step 4 ____ 5: Step 5 ____ 6: Step 6 ____ 7: Step 7 ____ 8: Step 8 ____

选项
A.If unbalanced, identify the most complex substance
B.Adjust the coefficients to balance polyatomic ions as a unit (if present)
C.Adjust the coefficients to balance any remain atoms
D.Check if the number of each atom is balanced, is the same on each side of the equation
E.Adjust the coefficients in front of each molecule or element until each atom for the most complex substance is balanced
F.Write out an unbalanced equation with the correct chemical formula for each reactant and each product
G.Count the number of each atom in the reactants and in the products
H.Check again if each atom is balanced
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标准答案
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思路分析
Here is a step-by-step analysis of each matching item in the list, evaluated in the context of the typical balance-by-inspection procedure. Option 1: 'If unbalanced, identify the most complex substance' — In the standard sequence, identifying the most complex substance occurs after you have written the unbalanced equation and counted atoms. This statement is out of order when considered by itself and belongs later than the initial setup steps. Therefore, this option is not in the correct position. Option 2: 'Adjust the coefficients to balance polyatomic ions as a unit (if present)' — Balancing polyatomic ions as a unit is a specialized technique used after recognizing the overall balancing needed and after choosing starting points for balancing. It typically comes after the initial identification and before addressing remaining atoms, but it is not the first action once unbalanced......Login to view full explanation

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