Номер 5, страница 176 - гдз по английскому языку 11 класс (enjoy english) учебник Биболетова, Бабушис

Appendix 2. What makes Chemistry fascinating? - номер 5, страница 176.

Условие.

5 a) Complete the texts about the items in the chemistry laboratory.

Use the words from the box.

mix	experiments	vertical	quantities
liquid	loss	reactions	convenient
boiling

Test tubes are essential things in a chemistry laboratory. They are used to hold, mix, or heat small (1) ... of chemicals. The chemicals may be solid or (2) .... Chemists often use test tubes when they perform (3) ... and demonstrations.

Test tube holders are used to keep several test tubes in a (4) ... position. It is important as some chemical (5) ... take time, and the chemists who perform the experiments need several tubes at hand. Clean test tubes are also kept in test tube holders.

Erlenmeyer flask is named after the German chemist Emil Erlenmeyer, who created it in 1860. The conical form and narrow neck of this flask make it very (6) ... to mix different liquids. The chemist can just swirl the content of the flask to (7) ... it. The narrow neck prevents the content from spilling out. Erlenmeyer flasks are often used for (8) ... liquids. It's not easy for hot vapors to get out through the narrow neck. A good part of the vapor condenses in the upper part of the flask and gets back to the liquid, reducing its (9) ....

5 b) Work in pairs. Choose one chemistry lab object and explain what it is used for.

Use the words and phrases in the box if needed.

LANGUAGE HELP

hold the chemicals

mix the chemicals

heat the chemicals

not to burn the fingers

to avoid injuries

to hold test tubes in a vertical position

condense

evaporate excess water

make a more concentrated solution

to produce solid crystals of the dissolved substance

Решение.

Решение 2.

Задание 5 a) Дополните тексты о предметах в химической лаборатории. Используйте слова из рамки.

Ответ:

1. quantities / количества

2. liquid / жидкими

3. experiments / эксперименты

4. vertical / вертикальном

5. reactions / реакции

6. convenient / удобной

7. mix / смешать

8. boiling / кипячения

9. loss / потерю

Задание 5 b) Работа в парах. Выберите один предмет из химической лаборатории и объясните, для чего он используется. При необходимости используйте слова и фразы из рамки.

Ответ:

I will choose the Erlenmeyer flask. We use it to mix the chemicals. You can hold it by the neck and swirl it, and the liquid won't spill out. It's also good when we need to heat the chemicals to make a more concentrated solution because its narrow neck helps to condense the vapor.

Я выберу колбу Эрленмейера. Мы используем ее, чтобы смешивать химические вещества. Ее можно держать за горлышко и взбалтывать, и жидкость не прольется. Она также хороша, когда нам нужно нагревать химикаты, чтобы сделать более концентрированный раствор, потому что ее узкое горлышко помогает конденсировать пар.