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| Electrical forces at the atomic level create _____________ __________ that join two or more atoms together, forming ____________. Some molecules consist of atoms of a single element.
Oxygen molecules, for example, are made up of two oxygen atoms. Chemists represent the oxygen molecule O2. The 2 indicates the number of atoms in the molecule. When atoms of two or more different elements bond together, they form a ____________________. Water is a compound made up of two hydrogen atoms and one oxygen atom. The__________ _________ for a water molecule is H2O. Compounds are formed or broken down by means of ____________ __________. All chemical reactions involve the formation or destruction of chemical bonds. Chemists use___________ ___________ to express what occurs in chemical reactions. Chemical equations consist of chemical formulas and symbols that show the substances involved in chemical change. For example, the equation C + O2 CO2 expresses the chemical change that occurs when one carbon atom reacts, or bonds, with an oxygen molecule. The reaction produces one molecule of carbon dioxide, which has the formula CO2. 2. Read the article again. The names of which chemical elements and compounds can you find there? 3. What is the meaning of the following expressions: chemical bonds bond together dense density 2.Примерный текст для письменного перевода и пересказа на дифференцированном зачёте в 4-м семестре 2-го курса для продолжающих жүктеу/скачать 285,62 Kb. Достарыңызбен бөлісу:
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