Review of Chemistry of Matter (Chapter 2,& 3 Test Review)ANSWERS

Review of Chemistry of Matter (Chapter 2,& 3 Test Review) ANSWERS

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.

1. What tinny, tiny things make up all the elements on the periodic table? ATOMS

2. What one particle (protons, neutron, electron) determine one element from another? PROTONS

3. If something takes up space (has volume) and has mass it must be ______. MATTER

4. When atoms combine, they do so by forming a ______bond. CHEMCIAL

5. A ______is a group of two or more atoms held together by chemical bonds. MOLECULE

6. A ______is a pure substance made of two or more elements chemically combined in a set ratio. COMPOUND

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

8. When two or more substances are physically combined (not chemically), they form a ______. MIXTURE

9. In a ______mixture, you can see the different parts. HETEROGENOUS

10. The substances in a ______mixture are so evenly mixed that you can’t see the different parts. HOMOGENOUS

11. A ______is any change that alters the form or appearance of matter, but does not make any new substance. PHYSICAL CHANGE

12. What forms when elements chemically combine with one another? (hint: they start with the letter “c”) COMPOUNDS

13. Water (H20), Carbon Dioxide (CO2), and Methane (CH4) are examples of ______since two or more different elements chemically combine. COMPOUNDS

14. What two elements make up table salt (NaCl)? SODIUM (Na) & CHLORINE (Cl)

15. What elements make up rust (Fe2O3)? Is rust a mixture, compound or element? IRON (2 ATOMS) AND OXYGEN (3 ATOMS) A COMPOUND

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

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

18. When atoms combine (products of a chemical reaction) they form what? NEW SUBSTANCES OR COMPOUNDS

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

MUCH (FAST) THE H2O (WATER) MOLECULES ARE MOVING

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

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

23. Steel melting is an example of which (chemical reaction, phase change or a physical change)?PHYSICAL CHANGE AND A PHASE CHANGE– (MELTING)

24. Paper burning is an example of which (chemical reaction, phase change or a physical change)? CHEMICAL REACTION AND PHYSICAL CHANGE

25. What state(s) of matter flow? LIQUIDS AND GASES

26. What is the central part of the atom called (the place where protons and neutrons are found)? NUCLEUS

27. What are positive charge particles in the nucleus called? PROTONS

28. What are neutrally charged particles in the nucleus called? NEUTRONS

29. What charge does an electron have? NEGATIVE

30. Copy down the picture below and fill in the arrows.

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)