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2. What major problem is discussed in the text? Express your opinion on the problem.

3. Study the uses of Common Elements.

Element

Symbol

Uses

Aluminium

Al

Outdoor furniture, building, foils

Barium

Ba

Paint, rat poison

Boron

B

Antiseptic, water softening, cleaning

Calcium

Ca

Limestone, cement, plaster

Carbon

C

Petroleum, alcohol ink, pencils

Chlorine

Cl

Swimming pools, bleach, herbicide

Chromium

Cr

Plating, tanning leather, stainless steel

Cobalt

Co

Colouring glass, high temperature alloys

Cooper

Cu

Brass, bronze, coins

Fluorine

F

Etching glass, air conditioning

Iodine

I

Table salt, antiseptic

Lead

Pb

Solder, batteries, X-ray shields

Lithium

Li

Flares, paint

Mercury

Hg

Light switches, thermometers

Nickel

Ni

Coins, safes, plating

Sulphur

S

Making paper, gunpowder, sulpha drugs

Zinc

Zn

Paints, galvanising

Continue the table indicating the uses of oxygen and nitrogen. Compose sentences describing the application of the elements using the phrases: is used for, is designed for, enters into the composition of, is a part of.

Grammar Practice

1. Put 3 types of questions (general, special and disjunctive) to each statement.

1. There are some elements that have no nutritional value.

2. The man-made elements are radioactive and toxic.

3. Some chemical compounds may be both poisonous and useful.

4. Toxicity varies from one species to another and within a species.

2. Translate the following word-building chains. Explain the way of forming these words.

Susceptibility – susceptible – susceptive; nutrition – nutritionist – nutritious – nutritive – nutritional; accumulate – accumulation – accumulative – accumulator; toxic – toxicant – toxicology – toxicosis – toxin; radioactive – radioactivity; poisonous – poison – poisoning – poisoner – poisoned; chemical – chemistry – chemist.

3. Find all the sentences with subordinate clauses in the text. Define their types.

13. New Material for Computer Memory

dramatically

значно

a vehicle

транспортний засіб

to boost

підвищувати

to reduce

зменшувати

storage

зберігання; пам’ять

a generation

покоління

to allow

дозволяти

to withstand

витримувати

definition

чіткість

an engine

двигун

to exceed

перевищувати

to improve

покращувати

a breakthrough

прорив

a technique

метод

doping

легування

application

застосування

an impurity

домішка

harnessing

підкорення

North Carolina State University engineers have created a new material that would allow a fingernail-size computer chip to store the equivalent of 20 high-definition DVDs or 250 million pages of text, far exceeding the storage capacities of today’s computer memory systems. The engineers made their breakthrough using the process of selective doping, in which an impurity is added to a material that changes its properties. The process also shows promise for boosting vehicles’ fuel economy and reducing heat produced by semiconductors, a potentially important development for more efficient energy production. Information storage is not the only area where advances could be made. By introducing metallic properties into ceramics engineers could develop a new generation of ceramic engines able to withstand twice the temperatures of normal engines and achieve fuel economy of 80 miles per gallon. And since the thermal conductivity of the material would be improved, the technique could also have applications in harnessing alternative energy sources like solar energy.

Speech patterns

far exceeding

значно перевищуючий

by far the best

явно найкращий

far and away the most important

безсумнівно найважливіший

so far

досі

as far as I know

наскільки я знаю

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