Lesson three Oral topic: in the chemical laboratory Grammar

Exercise 1. Find the corresponding definitions.

test- tube		a thing that burns or works by heat.
glassware		a substance used to show the presence of another by reaction.
funnel		a glass tube closed at one end, used in chemical experiments.
reagent		tools and instruments that help in performing and improving the core function.
burner		a thing that is used to hold test tubes, beakers.
accessories		things made of glass.
stand		a vessel wide and round at the top and narrowing to a small tube at the bottom used for pouring liquids into a small opening.

Exercise 2. Match the English word combinations with the Russian ones:

is equipped with is performed under the supervision are divided into are used for is recommended should be clean are required is affected by will be carried out are well ventilated

хорошо проветриваются; воздействует; необходимы быть чистыми; будет выполняться; требуются; рекомендуется; выполняется под руководством; делятся на; оснащена; используются для.

Exercise 3. Fill in the gaps with the verbs in a corresponding form: perform, recommend, allow, equip, use, avoid, improve, include, divide, influence.

1. 
   A good chemical laboratory is … with the basic measuring and analytical apparatuses.
   
2. 
   All the experiments should be … under the supervision of the lab instructor.
   
3. 
   The laboratory vessels and glassware are … into three groups.
   
4. 
   Special glassware … things necessary for carrying out different analyses.
   
5. 
   Burettes are … for very accurate measurements of volume.
   
6. 
   Graduated pipets … for very accurate liquid measurements.
   
7. 
   Certain tools and instruments do not directly … the research work in a laboratory.
   
8. 
   Lab accessories … working conditions and … injury as the laboratory safety equipment.
   
9. 
   It is … to close the glass bottles with glass caps to prevent their contamination from air.