Предмет: Химия, автор: SahkoLashko

а) P→P2O5→H3PO4→Na3PO4 б)Zn→ZnO→ZnCl2→Zn(OH)2→ZnSO4
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Ответы

Автор ответа: kokoshkolarisa2006
1

Ответ

1) 4P + 5O2 → 2P2O5

P2O5 + 3H2O → 2H3PO4

H3PO4 + 3NaOH → Na3PO4 + 3H2O

2) 2Zn +O2→ 2ZnO

ZnO + 2HCl→ ZnCl2 + H2O

ZnCl2 + 2AgOH → Zn(OH) + 2AgCl↓

Zn(OH)2 + H2SO4 → ZnSO4 + 2H2O

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Определите, какой тип речи представлен в предложениях 6—8 текста. Запишите ответ

Текст
(1)Галя училась на биологическом факультете и летом устроилась на работу в зоопарк. (2)Она помогала опытной служительнице Анне Васильевне убирать клетки с попугаями. (3)Девушке особенно нравилась пара гиацинтовых ара — больших птиц тёмно-голубого цвета. (4)Но служительница Галю к ним не пускала — видимо, боялась за неё. (5)Когда сама Анна Васильевна заходила к ним в клетку, попугаи всячески старались схватить её огромными клювами и ущипнуть, а она их отгоняла, как могла.

(6)Однажды Анна Васильевна заболела и на работу не вышла. (7)Вооружившись ведром и водой, тряпкой и метлой, Галя пошла убирать клетки. (8)Это был её первый самостоятельный день.

(9)Увидев новую служительницу, попугаи моментально спустились со своей полочки. (10)Они взволнованно лазали по решётке вокруг Гали и старались её ущипнуть. (11)Но Галя не стала их отгонять ни метлой, ни тряпкой. (12)Ласково она начала уговаривать птиц не сердиться. (13)И попугаи успокоились. (14)Когда же девушка, продолжая разговаривать, протянула руку к одному из них, тот схватил её за палец своим огромным сильным клювом, немного подержал и выпустил. (15)Очевидно, девушка птицам понравилась, и поэтому они её не тронули.

(16)Теперь Галя «подобрала ключ» к своенравным попугаям. (17)Оказывается‚ они, как и другие птицы, любят, когда с ними разговаривают ласково и спокойно.