Irina Bakaev
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Hi Ellie, I’m so pleased you can come surfing in August! Paul, Rose and Kevin are coming too, so there will be five of us. We decided to return to New Sands, because the surf board hire is so cheap there. I’m starting to think about accommodation. We won’t camp again after last year! I hated staying in a tent in all that rain! Kevin wants to hire a caravan. There are some nice ones with 3 bedrooms, showers and cooking facilities. The problem is, none of the caravan parks take short bookings in the summer. The minimum stay is a week. It’s a shame because there are several nice parks near the beach. There’s a youth hostel in New Sands. It’s the cheapest option after camping, and there is a big kitchen and dining room where we can cook. The problem is, accommodation is in dormitories and I don’t really want to sleep with strangers. There are a few guesthouses in New Sands. Some have triple rooms, so we would only need to book two rooms. They’re not expensive, but we wouldn’t be able to cook there. We would have to eat out at restaurants, or eat sandwiches for every meal! We’ll have to book soon if we choose that option, because many guest houses are already full. The hotels in New Sands are far too expensive, even though I would love to stay at the Sunrise Pavilion with its rooftop The final option is to rent a cottage. Few cottages offer mid-week breaks in summer, but I found one. It has three bedrooms - a double, a single and a twin, so two of us would have to share a bed! There is a big kitchen diner with a microwave, washing machine and dishwasher. The living room has a TV and DVD player. There is just one bathroom, but there is a separate WC. There is a nice garden too. The problem is, it’s 5 miles from the beach, so we’d have to hire a car, because there aren’t any buses. Let me know which option you prefer. 2 The friends want to stay in New Sands for… A) A week B) A week and a half C) Less than one week D) Three weeks

Химия

Ответы

olgalooo

Объяснение:

   При нагревании до 180° С в умеренном количестве кислорода образуется оксид натрия:

   4Na + O2 = 2Na2O

  2.      Натрий горит на воздухе с образованием пероксида натрия:

   2Na + O2 = Na2O2

   Натрий хранят под слоем керосина.

   3.      Расплавленный натрий в хлоре сгорает с ослепительной вспышкой (можно говорить проще — реагирует с хлором при нагревании), на стенках сосуда образуется белый налет хлорида натрия:

   2Na + Cl2 = 2NaCl

   4.        Натрий может взрываться при растирании с порошком серы (образуется сульфид натрия):

   2Na + S = Na2S

  5.         Натрий при нагревании восстанавливает водород, образуется гидрид натрия:

   2Na + H2 = 2NaH

Ye.Vadim

Дано:
электролиз раствора Hg(NO₃)₂
M(Hg) =60,3г.
Vm=22,4л./моль

V(газа)-?
Вещество в растворе -?


1. Электролиз раствора ртути:
Hg(NO₃)₂ ⇄ Hg²⁺ + 2NO₃⁻
катод (–) : Hg²⁺ + 2е⁻ → Hg⁰
анод (+) : 2H₂O - 4e⁻ → O₂⁰↑ + 4H⁺
Суммарное уравнение:
2Hg(NO₃)₂ + 2H₂O + электролиз = 2Hg↓ + O₂↑ + 4HNO₃


2. Определим молярную массу ртути и ее количество вещества в 60,3г.:
M(Hg)=201г./моль
n[Hg) =m(Hg)÷ M(Hg)=60,3г.÷201г./моль=0,3моль


3. По уравнению реакции: n(Hg) =2моль  n(O₂) = 1моль

 по условию задачи:
n(Hg) =0,3моль  n(O₂) = 0,3моль×1моль÷2моль=0,15моль 


4. Определим объем кислорода количеством вещества 0,15моль:
V(O₂) =n(O₂) x Vm= 0,15моль x 22.4л./моль=3,36л. 


5. Определим молярную массу азотной кислоты, количество вещества и массу азотной кислоты:
а) M(HNO₃)=1+14+16x3=63г./моль
б) по уравнению реакции:
n(Hg) =2моль n(HNO₃) = 4моль
в) по условию задачи:
n(Hg) =0,3моль n(HNO₃)=0,3мольх4моль÷2моль=0,6моль
г) m(HNO₃)= n(HNO₃)xM(HNO₃)=0.6мольх63г./моль=37,8г.

5. ответ: при электролизе нитрата ртути образуется 60,3г ртути, 3,36л. кислорода и 37,8г. азотной кислоты.

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Hi Ellie, I’m so pleased you can come surfing in August! Paul, Rose and Kevin are coming too, so there will be five of us. We decided to return to New Sands, because the surf board hire is so cheap there. I’m starting to think about accommodation. We won’t camp again after last year! I hated staying in a tent in all that rain! Kevin wants to hire a caravan. There are some nice ones with 3 bedrooms, showers and cooking facilities. The problem is, none of the caravan parks take short bookings in the summer. The minimum stay is a week. It’s a shame because there are several nice parks near the beach. There’s a youth hostel in New Sands. It’s the cheapest option after camping, and there is a big kitchen and dining room where we can cook. The problem is, accommodation is in dormitories and I don’t really want to sleep with strangers. There are a few guesthouses in New Sands. Some have triple rooms, so we would only need to book two rooms. They’re not expensive, but we wouldn’t be able to cook there. We would have to eat out at restaurants, or eat sandwiches for every meal! We’ll have to book soon if we choose that option, because many guest houses are already full. The hotels in New Sands are far too expensive, even though I would love to stay at the Sunrise Pavilion with its rooftop The final option is to rent a cottage. Few cottages offer mid-week breaks in summer, but I found one. It has three bedrooms - a double, a single and a twin, so two of us would have to share a bed! There is a big kitchen diner with a microwave, washing machine and dishwasher. The living room has a TV and DVD player. There is just one bathroom, but there is a separate WC. There is a nice garden too. The problem is, it’s 5 miles from the beach, so we’d have to hire a car, because there aren’t any buses. Let me know which option you prefer. 2 The friends want to stay in New Sands for… A) A week B) A week and a half C) Less than one week D) Three weeks
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