The scientist a wonderful discovery a) were b) was c) have d) is e) has ​

утвердительные:

1. there are a lot of flowers in the garden.

2. there is a pen on the table.

3. there is a book on the shelf.

4. there are 2 chairs in my room.

5. there are some sunflowers in the vase.

6. there is a wardrobe in my parents' bedroom.

7. there is a kitchen unit in our new kitchen.

8. there is a table, a computer and an armchair in my room.

9. there are a lot of sights in moscow.

10. there are a lot of parks in london.

вопросительные:

1. are there any sights in moscow?

2. are there any parks in london?

3. is anybody here?

4. is there a bird in the tree?

5. is there a pen on the table?

6. what is there in your bag?

7. are there many flowers in the garden?

8. how many books are there?

9. is there a computer in your room?

10. is there a fireplace in your living room?

отрицательные:

1. there is no books on the table.

2. there aren't any pens here.

3. there isn't any sugar in the cup.

4. there are no chairs in the room.

5. there aren't any cars in the street on sunday morning.

6. there isn't any tea in the cup.

7. there is no carpet on the floor.

8. there aren't any new houses in our street.

9. there is no water in the bottle.

10. there aren't any bananas in the fridge.

объяснение:

отметь ответ лучшим, если

buffer solutions, depending on their composition, are divided into 2 main types:

acidic and basic.

acid buffering systems are usually formed by a weak inorganic or

organic acid and a salt of the same acid with a strong base.

for example:

1) ch3cooh + ch3coona - acetate buffer

weak acid salt acid

2) h2co3 (h2o + co2) + nahco3 - hydrocarbonate or

weak acid salt acid bicarbonate buffer.

basic buffer systems are formed by weak inorganic or

organic base and a salt of this base with a strong acid. for example:

1) nh3 · h2o (nh4oh) + nh4cl - ammonia buffer

weak base salt

2) c2h5 – nh2 + c2h5nh3cl - ethylamine buffer

weak base salt

basic buffer systems are formed by weak inorganic or

organic base and a salt of this base with a strong acid. for example:

1) nh3 · h2o (nh4oh) + nh4cl - ammonia buffer

weak base salt

2) c2h5 – nh2 + c2h5nh3cl - ethylamine buffer

weak base salt.