Вопрос школьника по предмету Химия
1. определить степень окисления. Указать окислитель и восстановитель. 2. написать электронный баланс. 3. расставить коэффициенты. K2Cr2O7+KI+H2SO4->I2+Cr2(SO4)3+K2SO4+H2O
Ответ учителя по предмету Химия
Ответ:
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Объяснение:
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1)5а³-3а²
2)9m-²
3)-1
— -это дробь
3a+2
4)6
—
у²-2у
5)-3х+21
————
Х³-7х²