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IV. Read and translate the words paying attention to the word-building element. Whether “en” is used at the beginning or at the end of a word, the meaning is the same

1. rich – enrich circle – encircle

able – enable large – enlarge

danger – endanger sure – ensure

close – enclose

2. black – blacken moist – moisten

dark – darken thick – thicken

hard – harden deep – deepen

long – lengthen soft – soften

V. Match the synonyms:

a) basic, rate, occur, container, damage, flammable, generate

b) vessel, produce, main, destruction, ignitable, speed, happen.

VI. Match the equivalents:

a) confined, excessive, expose, evaporate, volatile, detonate, explosion

b) to explode with sudden violence or great noise, to change from liquid to vapour, easily vaporized or evaporated, to subject to an action or influence,

a sudden and violent bursting, exceeding the usual, restricted.

VII. Choose the correct words and translate the sentences:

a) to cause b) a cause c) to be caused

1. The most common … of gas fires is a leak in the gas system.

2. Very often gas fires … by a malfunctioning control.

3. A common malfunction of the valve … by setting a wrong material in the valve.

4. This … the components to be separated.

5. Heat … the substances to expand.

6. Explosions may … by an external source of energy such as heat.

7. When a valve surfaces become dry it … a valve breakage.

8. The sudden increase in pressure … the container to explode.

VIII. Choose the correct words and translate the sentences:

a) quantity c) explosion e) generate g) involving

b) detonation d) decompose f) involve

1. A type of explosion characterized by a much-increased reaction rate as well as a high pressure rise is called ….

2. An atomic bomb can cause a huge….

3. The water was … into hydrogen and oxygen.

4. The sun generates great … of heat and light.

5. High velocity explosions usually … a chemical reaction.

6. Gas explosion … methane, natural gas, propane or butane are characterized with low velocity explosions.

7. The explosion … a wind in the mine shaft because the air is pushed ahead of the flame.

IX. Write explanations in answer to the following questions. Choose between because and because of / owing to.

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