Упр.5 Appendix 2 Chemistry 2020 ГДЗ Enjoy English 11 класс
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.
Решение #
Решение #
Приведем выдержку из задания из учебника Биболетова, Бабушис 11 класс, Дрофа:
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)...
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