Химия | 10 - 11 классы
What mass of CaH2 is produced at the end of 5g of Ca with excess H2?
K2CO3 - CO3 - CO - CO2 - CaCO3 - CaH(CO3)2 - CO2?
K2CO3 - CO3 - CO - CO2 - CaCO3 - CaH(CO3)2 - CO2.
Найдите валентность AeO KO CAH NEO FEO PH?
Найдите валентность AeO KO CAH NEO FEO PH.
Put the verbs in Present Simple : Before Christmas, children?
Put the verbs in Present Simple : Before Christmas, children.
(to write) a letter to Santa Claus with their wishes.
Then on Cristmas Eve they .
( to leave) for him food or drinks.
They .
( to believe) that Santa Claus .
( to put) presents in their Christmas stockings.
They also .
(to believe) that Santa .
( to live) at the North Pole and .
( to make) Christmas toys for children.
On Christmas Eve he .
( to fly) to the houses of all good cgildren and .
( to bring) them presents.
С какими веществами взаимодействует кальций Ca?
С какими веществами взаимодействует кальций Ca?
\ What substances interacts calcium Ca?
Leo's got a football?
Leo's got a football.
The football is .
НАПИШИТЕ ФОРМУЛЫ СЛЕД, ВЕЩ И РАСЧИТАЙТЕ ИХ ОТНОСИТЕЛЬНОЕ МОЛЕК - НЫЕ МАССЫ CaH?
НАПИШИТЕ ФОРМУЛЫ СЛЕД, ВЕЩ И РАСЧИТАЙТЕ ИХ ОТНОСИТЕЛЬНОЕ МОЛЕК - НЫЕ МАССЫ CaH.
CuSO2.
HNO3 BaOH.
Put the verbs in brackets into the correct tense form and voice?
Put the verbs in brackets into the correct tense form and voice.
Mark to be) 13 years old.
He (to live) in Manchester and (to go) to a grammar school.
Mark always (to enjoy) using computers.
He (to start) using them three years ago.
He (to use) it to write his English compositions.
This year, Mark (to do) very well in his school tests and, as a reward, his parents (to buy) him a modem.
A modem (to allow) his computer to ‘talk’ over the telephone to other computers.
Mark (to use) his modem for a few weeks now.
He (to send) messages to his friends all over the world.
He even (to play) computer games with his friends in Australia.
Определите формулы по валентности 1?
Определите формулы по валентности 1.
NO 2.
CaH 3.
ZnCl 4.
KN 5.
MgI.
Put the verbs in the correct form, and you will get a storyI (study) English at Boston University?
Put the verbs in the correct form, and you will get a story
I (study) English at Boston University.
I (be) on holiday at the moment and I (work) at the public library.
I (be) lucky to have this job.
The library (open) at 10 and (close) at 7.
It (be) an interesting job because people (come) and (ask) me to help them so so I (learn) a lot about different subjects.
I (enjoy) the job and (find) it very amusing.
People (use) the strangest things as bookmarks.
I have a piace of bacon once!
Matchsticks (be) common and so (be) bus tickets.
My colleagues often (find) things to - even a tendollar note!
But I haven't been so luckly.
I often (think) of the fhoto of a beautiful woman I have found.
On the back were the words : "I (love) you and will never forget you.
".
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CaH2 - - > ; Ca + H2↑
1) n(Ca) = 5g : 40g / mol = 0, 125mol
2) n(CaH2) = n(Ca) = 0, 125mol
3) m(CaH2) = 0, 125mol * 42g / mol = 5, 25g.