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以下有两份小资料卡片：阅读小资料中1和2的信息，根据初中的化学知识，回答下列问题 （1）上述叙述中属于过碳酸钠物理性质的是__________，主要属于化学性质的是_________，属于用途的是_________。 （2）写出过碳酸钠溶于水得到过氧化氢的溶液和碳酸钠溶液的化学方程式：___________ （3）过碳酸钠的相对分子质量为____________。
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【简答题】如图 所示电路中,已知 I S =4A , U S =10V , R 1 = R 2 =2Ω ,求 I 1 和 I 2 。
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A.
so has he
B.
Neither he has
C.
He has too
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He hasn't either
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so hard
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so a hard
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such a hard
D.
such hard
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