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
б) C6H6O (фенол, без формулы,т.к. это одно вещество). Так и называется - фенол.
в) C4H8O (альдегид, формула CnH2nO). Вещество - бутаналь.
CH3
|
а) CH3-CH-CH-CH2OH CH2OH-CH2-CH2-CH2-CH3
|
CH3 н-пентанол
2,3-диметилбутанол (изомер)
CH3
|
CH2OH-CH2-C-CH3
|
CH3
3,3-диметилбутанол (изомер)
б)
/ \ _ OH / \ _ ОН
| | _ CH3 Н3С _ | |
\ / \ /
1-гидрокси-2метилбензол (изомер) 1-гидрокси-4-метилбензол (изомер)
О - CH3
|
/ \
| |
\ /
Крезол (гомолог)
в)
СH3-СH2-СH O
| || ||
CH3 O H3C-С-CH2-CH3
2-метилпропаналь (изомер) бутаналь (изомер)
H-C-H
||
O
метаналь (гомолог)
m(р-ра CH₃COOH)=20г.
ω%=15%
m(H₂O)=130г.
ω%нового раствора -?
1.Определим массу уксусной кислоты в 20г. 15% раствора:
m(CH₃COOH)=ω%×m(р-ра CH₃COOH)÷100%=15%×20г.÷100%=3г.
2. Определим массу воды в 20г. 15% раствора:
m₁(H₂O)=m(р-ра CH₃COOH)-m(CH₃COOH)=20г.-3г.=17г.
3. Находим массу нового раствора:
m₁(р-ра CH₃COOH)=m(H₂O)+m(CH₃COOH)+m₁(H₂O)=130г+3г.+17г.=150г.
4. Находим массовую долю нового раствора:
ω%нового раствора=m(CH₃COOH)÷m₁(р-ра CH₃COOH)×100%=
= 3г÷150г.×100%=2%
5. Концентрация нового раствора уксусной кислоты стал 2%