Вопрос № 1072221 - Английский язык

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Compound is a substance in which the atoms of two or more elements are joined together by chemical bonds. Because of these bonds, it is very difficult to split a compound into its individual elements. The type and number of bonds formed depend on the electrons (particles with a negative electrical charge) in each atom. The properties of a compound can be very different from those of the elements it contains. For example, the salt we use in our food is a harmless compound, yet it is made up of two dangerous elements – sodium, which reacts violently with air, and chlorine, which is poisonous in large quantities.

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Heat is a form of energy that transfers from one object or body to another if there is a difference in temperature between the two. When you are hot, for example, and the air outside your body is cooler, you lose heat to the air. A change in a body’s level of heat results in a change in the energy of its molecules. This gives rise to a temperature change, which may in turn lead to a change of state.

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The Italian physicist Alessandro Volta was a pioneer in the development of electricity. 1_______. His work impressed the French leader Napoleon Bonaparte, who made him a count. 2_______. Volta also studied the properties of air. 3_______. This work was largely ignored, and the same idea was later advanced by others. 4_______.

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The Earth is one of nine planets that travel around the sun in the solar system. 1_______. It is the only planet known to support life. 2_______. At first this mass was very cold. 3_______. Heavy metals collected at the center and rocks floated near the surface. After millions of years, the rocks formed a hard crust. 4_______.

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A solution forms when one substance (usually solid) dissolves in another (usually a liquid). The solid breaks up into tiny particles and spreads throughout the liquid. 1_______. Solutions are always clear. 2_______. Solid particles spread throughout the liquid. 3_______. If you leave a suspension to stand, most of the solid particles will eventually sink. 4_______.

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Separating the different parts of a compound using electricity is called electrolysis. 1_______. It must contain ions. 2_______.When the plates are connected to a battery, an electric current passes through the compound, which is gradually split into two parts. 3_______.So it attracts the positive ions of the compound. 4_______.