Science

7th -

9thgrade

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化學反應式平衡

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  • 1. Multiple Choice
    30 seconds
    1 pt
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    銅置於濃硫酸中加熱反應的化學方程式如圖。經平衡後,係數為最簡單整數時,生成物的係數總和為下列何者?

    3

    4

    5

    6

  • 2. Multiple Choice
    30 seconds
    1 pt

    乾粉滅火器是利用高壓氮將乾粉(碳酸氫鈉)噴向火源,以受熱分解出的二氧化碳滅火,其反應式為xNaHCO3→yNa2CO3+zCO2+wH2O,平衡後下列何者正確?

    x=y

    x=y+z

    x=y+z+w

    y=z+w

  • 3. Multiple Choice
    30 seconds
    1 pt

    已知氧化鈉中鈉與氧之原子數比為2:1,則鈉和氧反應產生氧化鈉的反應式,下列何者正確?

    2Na+O --> Na2O

    Na2+O2-->2NaO

    4Na+O2-->2Na2O

    Na+O2--NaO2

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