ROUND-UP 1 Fill in the text with a suitable word for each blank space. There are two extra words you do not need to use. container elements gases mass particles pressure shape states structure substances temperature volume 2 Matter is what all (1) ........................................... consist may modify their volume. Neither liquids, nor solids of and (2) ........................................... are the chemical can be compressed. (8) ........................................... expand building blocks of matter. Elements cannot be in volume and shape until they fill their container broken down or changed into another substance. completely, and their (9) ........................................... is Matter has four (3) ...........................................: solid, liquid, affected by temperature and pressure. gas and plasma. It has the following physical Highly-charged (10) ........................................... with extremely properties: a solid has a fixed volume, which does high kinetic energy make up plasma, which is not vary much with (4) ........................................... and a rigid not a common state of matter on Earth. There are shape. The (5) ........................................... of liquids changes other known states of matter, such as BEC (Bose- depending on the (6) ..........................................., while Einstein Condensates), also called the fifth state changes in temperature and (7) ........................................... of matter . Choose the right option. 1. ........................................... are located in the nucleus of an atom. of ........................................... and ........................................... in a. Protons and electrons b. Protons and neutrons c. Protons and ions its ............................................ a. electrons protons atom b. protons neutrons nucleus c. electrons neutrons - nucleus 2. The atom is neutral because the number of ........................................... equals the number of 5. A ........................................... is the smallest ........................................... . ........................................... in a chemical a. protons electrons b. protons neutrons c. neutrons electrons ........................................... or compound that has the chemical properties of that element 3. The atomic number is the number of ........................................... in the nucleus of the atom. a. protons 3 4. An element s mass number is the sum b. electrons c. neutrons or compound. a. particle element molecule b. element particle molecule c. molecule particle element Answer the following questions. 1. What are molecules made up of? 2. What are compounds? .............................................................................................................................................................................................. ......................................................................................................................................................................................................................... 3. How does an ionic bond form? .................................................................................................................................................................................................... 4. How does a covalent bond form? ............................................................................................................................................................................................... 52 THE WONDER OF CHEMISTRY