Решение Задачи Warming up (Разминка) по Английскому

Ниже представлены ответы на задания из учебных материалов, подготовленные для удобного переписывания в тетрадь. 1. Warming up (Разминка) 1) How would you define the Periodic Table? The Periodic Table is a tabular display of all known chemical elements, organized by their atomic number, electron configuration, and recurring chemical properties. 2) Think of the Periodic Law. What comes to your mind? The Periodic Law states that the physical and chemical properties of elements are periodic functions of their atomic numbers (originally atomic weights). It reminds me of the predictable patterns in element behavior. 3) Who developed an early version of the Periodic Table? The most significant and successful early version was developed by the great Russian scientist Dmitry Mendeleev in 1869. Other scientists like Dobereiner (triads), Newlands (octaves), and Meyer also made contributions, but Mendeleev's system was superior because he predicted undiscovered elements. 4. Match the terms in A with the definitions in B (Соотнесите термины) 1 — b) weight: how heavy a person or thing is 2 — c) verify: to check or prove that something is true or correct 3 — a) valency: a measurement of the ability of an atom to combine with other atoms 4 — f) compound: a chemical substance that consists of two or more elements 5 — d) halogen: a chemical element belonging to a group of five that combine with metals to form salts 6 — e) alkaline: containing an alkali or consisting of an alkali 7 — h) helix: a shape formed by a long, continuously curving line 8 — g) element: a substance that consists of only one type of atom 5. Give the forms of the following verbs and make up sentences (Формы глаголов и предложения) Примеры для некоторых глаголов: 1) To discover (discovered, discovered). Mendeleev discovered the Periodic Law in 1869. 2) To classify (classified, classified). Scientists classify elements into groups and periods. 3) To predict (predicted, predicted). Mendeleev predicted the properties of germanium before it was found. 4) To exist (existed, existed). Many elements exist in nature as compounds. 6. Choose the most suitable title (Выбор заголовка) The most suitable title for the text is: 3. Development of the Periodic Table. (Этот заголовок наиболее полно отражает содержание текста, описывающего историю открытий от триад до современной системы). 7. Questions based on the comparison table (Вопросы к таблице сравнения свойств) 1) What was the predicted atomic weight of eka-silicon? The predicted atomic weight was about \( 72 \). 2) What is the actual atomic weight of germanium? The actual atomic weight is \( 72.60 \). 3) How did Mendeleev suggest obtaining eka-silicon? He suggested it could be obtained from \( EsO_{2} \) or \( K_{2}EsF_{6} \) by reduction with sodium. 4) What is the density of germanium compared to the prediction? Mendeleev predicted a density of \( 5.5 \), and the observed density is \( 5.36 \text{ g/cm}^{3} \). 5) Is germanium soluble in acids? Germanium is not dissolved by \( HCl \), but it is dissolved by concentrated \( H_{2}SO_{4} \) and \( HNO_{3} \).