<p> Review of Chemistry of Matter (Chapter 2,& 3 Test Review) ANSWERS</p><p>Directions: Review and check all your answer with this answer sheet to get ready for the test on Chemistry of Matter (Chapter 2 & 3). Enjoy.</p><p>1. What tinny, tiny things make up all the elements on the periodic table? ATOMS</p><p>2. What one particle (protons, neutron, electron) determine one element from another? PROTONS</p><p>3. If something takes up space (has volume) and has mass it must be ______. MATTER</p><p>4. When atoms combine, they do so by forming a ______bond. CHEMCIAL</p><p>5. A ______is a group of two or more atoms held together by chemical bonds. MOLECULE</p><p>6. A ______is a pure substance made of two or more elements chemically combined in a set ratio. COMPOUND</p><p>7. A ______is a single kind of matter that is pure, meaning it always has a specific makeup, and a specific set of properties and is the same everywhere. SUBSTANCE</p><p>8. When two or more substances are physically combined (not chemically), they form a ______. MIXTURE</p><p>9. In a ______mixture, you can see the different parts. HETEROGENOUS</p><p>10. The substances in a ______mixture are so evenly mixed that you can’t see the different parts. HOMOGENOUS</p><p>11. A ______is any change that alters the form or appearance of matter, but does not make any new substance. PHYSICAL CHANGE</p><p>12. What forms when elements chemically combine with one another? (hint: they start with the letter “c”) COMPOUNDS</p><p>13. Water (H20), Carbon Dioxide (CO2), and Methane (CH4) are examples of ______since two or more different elements chemically combine. COMPOUNDS</p><p>14. What two elements make up table salt (NaCl)? SODIUM (Na) & CHLORINE (Cl) </p><p>15. What elements make up rust (Fe2O3)? Is rust a mixture, compound or element? IRON (2 ATOMS) AND OXYGEN (3 ATOMS) A COMPOUND</p><p>16. ______have atoms that are close together and have a defined shape while ______have atoms that are more spread out freely moving around and tend to take the shape of the container they are in and ______tend to have atoms that are really far apart and completely fill the entire container they are placed in. SOLIDS, LIQUIDS, GASES</p><p>17. An ______solid has not definite shape (it acts like a liquid and a solid) while a ______solid has regular, repeating patterns (like NaCl). AMORPHOUS, CRYSTALLINE</p><p>18. When atoms combine (products of a chemical reaction) they form what? NEW SUBSTANCES OR COMPOUNDS</p><p>19. Can you create or destroy matter? What percent is destroyed during a chemical reaction? NO ZERO 20. Why sometimes is water: solid (ice), liquid (liquid water), and gas (steam)? DEPENDS ON ENERGY (HEAT) AND HOW </p><p>MUCH (FAST) THE H2O (WATER) MOLECULES ARE MOVING</p><p>21. Is the melting of ice a chemical or physical change? Do bonds break between the hydrogen and oxygen atoms? PHYSICAL CHANGE, NO BONDS BREAK</p><p>22. How can you make particles move faster? In other words, how can you change ice into liquid water? ADD HEAT (ENERGY) TO THE WATER MOLECULES AND CAUSE IT TO CHANGE STATE (PHASE CHANGE) FROM SOLID TO LIQUID</p><p>23. Steel melting is an example of which (chemical reaction, phase change or a physical change)?PHYSICAL CHANGE AND A PHASE CHANGE– (MELTING)</p><p>24. Paper burning is an example of which (chemical reaction, phase change or a physical change)? CHEMICAL REACTION AND PHYSICAL CHANGE</p><p>25. What state(s) of matter flow? LIQUIDS AND GASES</p><p>26. What is the central part of the atom called (the place where protons and neutrons are found)? NUCLEUS</p><p>27. What are positive charge particles in the nucleus called? PROTONS</p><p>28. What are neutrally charged particles in the nucleus called? NEUTRONS</p><p>29. What charge does an electron have? NEGATIVE</p><p>30. Copy down the picture below and fill in the arrows. </p><p>HIDDEN BONUS: Which has the greatest viscosity? (water, liquid nitrogen, or honey) HONEY – it has the greatest resistance to flow. Liquid nitrogen and water have low viscosity (they flow pretty easily)</p>