Предмет: Химия, автор: mortisprodaksn

даю 100 балов 6 заданий​

Приложения:

Ответы

Автор ответа: aminessa1
1

Ответ:

№1.

+2-4

Be2C - карбид беррилия

+3-4

Al4С3 - карбид алюминия

+4-2

CS2 - сероуглерод

+4-1

CF4 - фтороуглерод

№2.

углерод проявляет востановительные свойства когда он отдаёт электроны и его степень окисления увеличивается

в 1 случае степень окисления уменьшилась

во 2 осталась прежней (+4)

в 3 ст.ок. увеличилась

в 4 уменьшилась

т.о. правильный ответ - В)

№3.

улерод будет окислителем в том случае если он будет принимать электроны и его ст.ок. уменьшаться

такое будет происходить в пункте - Г(была 0 стала -2)

№4

750 x

С+O2=CO2 - реакция горения угля

1 1

m(C)=W(C)*m(угля)=10000*0,9=9000 gramm

n(C)=m/M=9000/12=750 moll

n(O2)=x=750*1/1=750 moll

V(O2)=Vm*n=750*22.4=16800дм3

w(O2)в воздухе=0,21 - по объёму

V(vozduha)=V(o2)/w(o2)=16800/0,21=80000dm3

Похожие вопросы
Предмет: Қазақ тiлi, автор: диана1458
Предмет: Английский язык, автор: ibgvussgvcjh
помогите в решении
1. If I were you, I ----- PROLOG.
a. might learn
b. would learn
c. would have learned
2 What ----- electronics ?
a. are
b. is
c. were
3 Computers have a means ------ with the user.
a. by communicating
b. of communicating
c. communicated
4 The programs ----- to help people in the use of the computer system.
a. write
b. have written
c. are written
5 What is that ? ----- my personal computer.
a. it
b. there
c. its
6 We are playing ----- favourite computer game.
a. ours
b. our
c. us
7 He used to know FORTRAN IV, when he was a student, ----- he ?
a. didn’t
b. usedn’t
c. used
8 I’m really looking forward ----- to college.
a. going
b. to go
c. to going
9 What devices ----- for inputting information into the computer.
a. are used
b. are using
c. use
10 Computers ----- replace people in dull routine work.
a. can
b. could
c. must
11 When ----- the transistor ----- ?
a. is invented
b. was invented
c. invented
12 Computers work according to the instruction ----- to it by users.
a. giving
b. given
c. to give
13 I don’t have enough money, but if I ----- I would buy that computer.
a. had
b. did
c. have had
14 ----- you imagine modern life without electronics?
a. could
b. can
c. may
15 ----- the problem we must make some experiments.
a. study
b. to study
c. studied
16 He is the ----- computer engineer at our University.
a. good
b. better
c. best
17 The computer’s input device ----- the information into computer.
a. read
b. reads
c. is reading
18 What ----- the ways of inputting information into the computer ?
a. are
b. were
c. do
19 The manager went home early ----- he had finished his work.
a. till
b. because
c. while
20 ----- well ----- for the exams the students could answer all the questions the professor asked them.
a. having been ----- prepared
b. having ----- prepared
c. had ----- prepared