Вопрос школьника по предмету Химия
Чому амінокислоти є аммфотерними сполуками?
Ответ учителя по предмету Химия
Так как у них есть аминогруппа-это ОСНОВНЫЕ свойства и карбоксильная группа-это КИСЛОТНЫЕ свойства . Вместе они дают АМФОТЕРНЫЕ свойства, то есть что-то между
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Do you know what superstition is? Match the left and right columns and read
the superstitions.
1. Lucky to knock
2. The luck runs out of the horseshoe
3. Friday the thirteenth
4. The bride and groom
5. If you drop a table knife,
6 . Unlucky to spill
a. salt.
b. is a very unlucky day.
c. will bring that person bad luck.
d. when the moon is growing.
e. you will soon receive money.
f. if it is upside down.
I know you have fired me, but we all need your help. Last night Misha, Rob and Mark went to a party with their friends. They put on their coolest clothes, opened a window, climbed down the roof and went to the party by taxi.
At the party they danced, drank cola, ate sandwiches, played pool and computer games, listened to music. They got back to school, but they couldn’t climb up the roof. They hadn’t thought about it, They woke me up because my room is on the ground floor. I opened the window for them. We were talking in my room when I noticed something: Rob had disappeared.
Yours,
Ex-agent Cute
Подчеркнуть глаголы в разных временах например:Past Simple,Past Perfect,Present Progresive и так далее
1/х + 1/у = 7/ху
1/у — 1/х = 3/ху
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