Вопрос школьника по предмету Химия
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Ответ учителя по предмету Химия
K->K2O->KOH->KBr->K->K3PO4
4K+O2=2K2O
K2O+H2O=2KOH
KOH+HBr=KBr+H2O
2KBr=2K+Br2
6K+2H3PO4=2K3PO4+3H2
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in Great Britain, there is a holiday now which people call Mother’s Day. In the old days, many girls from workers’ families in towns and from farmers’ families in the country work in rich people’s houses. They had to do all the housework. Their working day was usually very long and they often worked on Sunday, too. One day year it was usually on Sunday in March they could visit their mothers. They went home on that day and brought presents for their mothers. THey could stay at home only one day, and then they went back to their work. People called that day Mothering Sunday. Later Mothering Sunday became a holiday Mother’s Day. It is usually on Sunday in the middle of March. Mother’s Day must be a day of rest for the mother of the family. In the United States of America and Canada, MOther’s DAy is the second Sunday in May.
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