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1. A stable carbon atom has the following parts:– 6 protons– 6 neutrons– 6 electronsDescribe the location of each of these parts in a carbon atom. 60 140 130 120 40 50 30 10 70 8 7 6 5 9 4 3 2 0 80 180 20 90 160 150 170 100 110 1 Seconds Left:

2. Protons and neutrons are found in the nucleus of the atom, at the very center. Electrons are found in an electron cloud that surrounds the nucleus.

3. If there only about 100 types of elements in the world, why are there so many different kinds of matter? 60 140 130 120 40 50 30 10 70 8 7 6 5 9 4 3 2 0 180 80 20 90 160 150 170 100 110 1 Seconds Left:

4. Elements can combine in many different ways to form many different types of matter.

5. Describe the difference between a mixture and a compound. 60 140 130 120 40 50 30 10 70 8 7 6 5 9 4 3 2 0 180 80 20 90 160 150 170 100 110 1 Seconds Left:

6. Compounds are chemically combined, mixtures are not.

7. Propane has three atoms of carbon and eight atoms of hydrogen. What is propane's chemical formula? This screen will disappear in 3 minutes. 70 120 50 130 60 30 40 10 140 8 7 6 5 9 4 3 2 0 80 180 20 90 160 150 170 100 110 1 Seconds Remaining.

8. C3H8

9. Describe the three kinds of particles found in atoms. Where are they located & what are their charges? This screen will disappear in 3 minutes. 130 120 140 70 30 50 40 60 9 8 7 6 5 4 3 10 180 20 90 160 80 2 0 150 170 100 110 1 Seconds Remaining.

10. Protons – in the nucleus, positive charge • Neutrons – in the nucleus, no charge • Electrons – outside the nucleus, negative charge

11. An electrically neutral atom undergoes a change to become negatively charged. The atom's atomic mass decreases. A student explains that the atom most likely lost a neutron.– Describe one strength and one weakness of the student's explanation. 60 140 130 120 40 50 30 10 70 8 7 6 5 9 4 3 2 0 180 80 20 90 160 150 170 100 110 1 Secondsleft:

12. One strength of the explanation is that an atom's mass consists mostly of the mass of its protons and neutrons. Electrons have very little mass. So, the atom must have lost either a proton or neutron.One weakness, however, is that neutrons have no charge. So, removing the neutron should not affect the atom's charge. It is more likely that a proton was removed.

13. Draw the Diagram –Identify the four parts of the atom that are pointed out by arrows in the diagram above. –Describe the electrical charges of the structures that are labeled 1, 2, and 3 in the diagram. 130 120 60 70 30 50 40 10 140 8 7 6 5 4 9 3 2 0 180 80 20 160 90 150 170 100 110 1 You have Seconds left.

14. Number 1 is the electron, 2 is the proton, 3 is the neutron, and 4 is the nucleus. The electron is negative. The proton is positive. The neutron is neutral.

15. Define these terms: Atom Element 130 120 60 70 30 50 40 10 140 8 7 6 5 4 9 3 2 0 180 80 20 160 90 150 170 100 110 1 Time left: Seconds

16. ATOM – the smallest part of matter that has the properties of the matter ELEMENT – matter made of only one type of atom; a pure substance

17. Define the terms: Mixture Compound Molecule 60 140 130 120 40 50 30 10 70 8 7 6 5 9 4 3 2 0 180 80 20 90 160 150 170 100 110 1 Seconds Remaining:

18. MIXTURE – a combination of different types of matter in no fixed proportion; can be physically taken apart physical change COMPOUND – a combination of different types of matter in specific proportions; must be chemically taken apart chemical change MOLECULE – the smallest part of a compound that has all the properties of that compound

19. Many chemical reactions occur around the home. – Describe one chemical reaction that occurs in a home and the products of the reaction. Seconds Remaining: 50 140 130 120 70 40 30 10 60 8 7 6 9 5 4 3 2 0 180 80 20 90 160 150 170 100 110 1

20. A chemical reaction that occurs around the home is the burning of charcoal for barbecues. When charcoal burns, it reacts with oxygen to form ash, carbon dioxide, and heat. The cooking of food is another example.

21. List the four signs of a chemical reaction 60 140 130 120 40 50 30 10 70 8 7 6 5 9 4 3 2 0 180 80 20 90 160 150 170 100 110 1 Seconds left:

22. Formation of a gas • Formation of a precipitate (solid in a liquid) • Color change • Energy change

23. Copper sulfate, when dissolved in water, has a blue color. When steel wool is mixed with a copper sulfate solution, the steel wool disappears, a brownish solid forms, and the color of the solution changes from blue to green.– Explain how three changes that occur in this experiment suggest a new substance may have been formed. Seconds Remaining: 50 140 130 120 70 40 30 10 60 8 7 6 9 5 4 3 2 0 180 80 20 90 160 150 170 100 110 1

24. The disappearance of the steel wool suggests that a new substance is forming. As steel does not dissolve in water, it is likely that it was part of the reaction that formed a new substance. Another new substance, the brown solid(precipitate), was observed forming. It is a different color from the other substances, it is also probably a new substance. The color change of the solution from blue to green implies that a chemical change has taken place.

25. Where are the metals, nonmetals, and metalloids located in the periodic table? 60 140 130 120 40 50 30 10 70 8 7 6 5 9 4 3 2 0 180 80 20 90 160 150 170 100 110 1 Seconds Remaining:

26. Metals - are on the left side • Nonmetals – are on the right side • Metalloids – are on a slanting line between the metals and nonmetals (zigzag) (stairstep)

27. Which group of elements on the periodic table does not readily combine with other elements? 60 140 130 120 40 50 30 10 70 8 7 6 5 9 4 3 2 0 180 80 20 90 160 150 170 100 110 1 Seconds Remaining:

28. Group 18 - the Noble Gasses

29. List the elements in this compound: H2SO4 How many atoms of each element are in the compound? 60 140 130 120 40 50 30 10 70 8 7 6 5 9 4 3 2 0 180 80 20 90 160 150 170 100 110 1 Seconds Remaining:

30. H2SO4 Hydrogen – 2 atoms Sulfur – 1 atom Oxygen – 4 atoms

31. What are the biggest parts of an atom? Seconds Remaining: 50 140 130 120 70 40 30 10 60 8 7 6 9 5 4 3 2 0 180 80 20 90 160 150 170 100 110 1

32. Protons & Neutrons

33. What happens to atoms during a chemical reaction? 60 140 130 120 40 50 30 10 70 8 7 6 5 9 4 3 2 0 180 20 90 160 150 170 100 110 1 80 SECONDS REMAINING:

34. Chemical reactions occur when different atoms and molecules combine together and spit apart. Atoms are re-arranged in the way they are connected (or bonded); they are not created or destroyed. Law of Conservation of Mass

35. Explain the difference between chemical and physical changes. SECONDS REMAINING: 50 140 130 120 70 40 30 10 60 8 7 6 9 5 4 3 2 0 180 80 20 90 160 150 170 100 110 1

36. PHYSICAL REACTION– is a change that affects the size, shape or color of a substance but does not affect its composition – no new substance is formed Examples might by melting, boiling, cutting, etc. CHEMICAL REACTION – is a change caused by the rearrangement of the atoms of one or more substances, resulting in the formation of new substances, having entirely different properties.

37. State the Law of Conservation of Mass 60 140 130 120 40 50 30 10 70 8 7 6 5 9 4 3 2 0 180 80 20 90 160 150 170 100 110 1 Seconds Remaining:

38. Matter cannot be created or destroyed in an ordinary chemical reaction.

39. What does a chemical equation tell us? 60 140 130 120 40 50 30 10 70 8 7 6 5 9 4 3 2 0 180 80 20 90 160 150 170 100 110 1 Seconds Remaining:

40. Chemical equations tell us how many atoms or molecules react with each other and how much of a substance is needed to react properly with another.

41. Describe endothermic and exothermic 60 140 130 120 40 50 30 10 70 8 7 6 5 9 4 3 2 0 180 80 20 90 160 150 170 100 110 1 Seconds Remaining:

42. Endothermic – absorbing energy(cold) Exothermic – releasing energy(hot)

43. A student wrote the following equation:4Al + 3O22Al2O3 – Write a sentence to describe what occurs in this reaction. 60 140 130 120 40 50 30 10 70 8 7 6 5 9 4 3 2 0 180 80 20 90 160 150 170 100 110 1 Seconds Remaining:

44. In this reaction, 4 aluminum reacts with 6 oxygen to form 2Al2O3.

45. What do coefficients & subscripts show us in chemical formulas? 60 140 130 120 40 50 30 10 70 8 7 6 5 9 4 3 2 0 180 80 20 90 160 150 170 100 110 1 Seconds Left:

46. H2SO4 = 2 – hydrogen 1 – Sulfur 4 – Oxygen subscript Coefficients – the number of molecules Subscripts – the number of atoms No number is understood to be “1” 3H2SO4 = H2SO4 H2SO4 H2SO4 6 – H, 3 – S, 12 - O coefficient

47. Describe metalloids. 60 140 130 120 40 50 30 10 70 8 7 6 5 9 4 3 2 0 180 80 20 90 160 150 170 100 110 1 Seconds Left:

48. Elements having properties of both metals and nonmetals.

49. Students carry out a chemical reaction by mixing two solutions in a glass beaker. A temperature probe in the beaker records changes in temperature that occur after mixing. Within seconds after mixing, the temperature rises from 25 °C to 40 °C. Then the temperature returns to 25 °C over a period of several minutes.–Based on this data, what should be concluded about the type of chemical reaction that has occurred? 60 140 130 120 40 50 30 10 70 8 7 6 5 9 4 3 2 0 180 80 20 90 160 150 170 100 110 1 Seconds Left:

50. The best conclusion is that an exothermic reaction has occurred. The students observe the temperature rising by 15 °C soon after they mix the chemicals. This shows that the reaction has given off energy as heat. Although there is cooling afterward, that is normal. Any hot object cools as it gives off heat.