1.Как осуществить превращение веществ по схеме:P2O5->H3PO4->Na3PO4->Ca3(PO4)2? Напишите молекулярные уравнения

ПОМОГИТЕ ПОЖАЛУЙСТА, СОСТАВИТЬ 10 СПЕЦИАЛЬНЫХ ВОПРОСОВ

CHARITY begins at home.

It is said that charity begins at home, and people in the UK 0)seem to have put these words into practice. Their enthusiasm for helping others shows in the 187,000 charity organisations that 1)exist in the country. Some of the most famous ones are Oxfoam, Age Concern, the RSPCA, the British Heart Foundation and Marie Curie Cancer Care.

People donate money to charity organisations or volunteer to help them 2)raise money. Many of these organisations run charity shops. The first charity shop in the United Kingdom was established by Oxfoam in Broad Street, Oxford. Oxfoam has the largest number of charity shops in the UK with 3)over 800 stores.

Charity shops sell goods at very 4)low prices. The items for sale are usually second-hand and donated by members of the public. These 5)include books, records, CDs, clothes, accessories, household items, furniture and costumes for 6)special occasions such as Halloween. There are bargains for 7)everyone! Some charity shops also sell new goods that are somehow related to the cause they 8)support. In Oxfoam stores, for example, you can find fair trade food and crafts. The staff who work at charity shops are volunteers, so most of the profits from the sales 9)go towards the charity. In the US, where charity shops are called thrift stores, this kind of shopping is so 10)popular that it has got it's own word, it's called thrifting!