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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 same1. 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. Example: Why do matches ignite when rubbed?
– because friction produces heat. Note: Do not repeat the noun after because; use a pronoun (it/they). Example: Wood floats on water because it is less dense than water.
Questions Reasons/Causes 1. Why do matches ignite when rubbed? a) Wood is less dense than water. 2. Why does water enter a pump? b) chemical reaction gets out of control 3. Why do flammable liquids explode? c) gravity 4. Why do hydrogen balloons rise in air? d) a dust concentration exceeds a lower explosive limits 5. Why does a dust explosion occur? e) Friction produces heat 6. Why do objects fall to the ground? f) Flammable liquids are very volatile. 7. Why does a chemical explosion occur? g) Air is denser than hydrogen. 8. Why does wood float on water? h) a difference in air pressure 9.Why does alcohol makes your hand feel i)Alcohol evaporates quickly, cold? absorbing heat from hand. X. Read and translate general and particular statements. Поиск по сайту: |
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