2. Covalent Bonds Ionic Bonds Element Families Chemical Reactions Grab Bag 10 20 30 40 50

3. Question 1 - 10 What types of elements form covalent bonds?

4. Answer 1 – 10 Nonmetals

5. Question 1 - 20 Describe what happens to the electrons involved in covalent bonds.

6. Answer 1 – 20 The electrons are shared. Each atom’s electrons are attracted to the positively charged nucleus of the other atom.

7. Question 1 - 30 Is the following compound a covalent compound: C 6 H 12 O 6

8. Answer 1 – 30 It is a covalent compound because it is composed of nonmetals. Hydrogen is a nonmetal.

9. Question 1 - 40 What is the common name for dihydrogen monoxide?

10. Answer 1 – 40 WATER! H 2 O Dihydrogen monoxide.

11. Question 1 - 50 True or False: – In a chemical reaction covalent bonds are broken atoms rearrange then form new bonds to form the products of the chemical reaction.

12. Answer 1 – 50 True.

13. Question 2 - 10 What is an ion?

14. Answer 2 – 10 An ion is an atom with a net charge. It becomes charged when it gains or loses electrons to obtain a full outermost energy level.

15. Question 2 - 20 Does calcium form a positive or negative ion?

16. Answer 2 – 20 Calcium has 2 valence electrons. When it becomes an ion it will lose those 2 valence electrons. This will give it an overall (2+) charge because it now has more protons than electrons.

17. Question 2 - 30 What types of elements form ionic compounds?

18. Answer 2 – 30 Metals and nonmetals.

19. Question 2 - 40 Is the MgCl 2 an ionic compound?

20. Answer 2 – 40 Yes, because it consists of a metal and a nonmetal.

21. Question 2 - 50 Explain how an ionic compound forms.

22. Answer 2 – 50 One atom loses one or more electrons. Another atom gains one or more electrons. Ions are formed. The oppositely charge ions attract and form an ionic compound.

23. Question 3 - 10 What is an element family?

24. Answer 3 – 10 A group of elements with similar properties.

25. Answer 2 – 40 Yes, because it consists of a metal and a nonmetal.

26. Question 3 - 20 Which family reacts explosively with water?

27. Answer 3 – 20 The Alkali Metals located in the first column of the periodic table.

28. Question 3 - 30 Which family does Chlorine belong to?

29. Answer 3 – 30 The halogens.

30. Question 3 - 40 Which family contains the least reactive elements?

31. Answer 3 – 40 The noble gases located in group 18.

32. Question 3 - 50 Which alkali metal is the most reactive?

33. Answer 3 – 50 Francium. As you move down a group reactivity increases because the valence electrons are located farther from the nucleus.

34. Question 4 - 10 True or False: Physical changes do not happen to chemicals.

35. Answer 4 – 10 FALSE. Chemical is just another name for a compound. Example: Water is a compound. Evaporation of water is a physical change.

36. Question 4 - 20 What is conservation of mass?

37. Answer 4 – 20 The same number and type of atoms present in the reactants will be present in the products. Mass is not created or destroyed in a chemical reaction.

38. Question 4 - 30 The decomposition of hydrogen peroxide form water and oxygen. If you start with 2H 2 O 2 what are the products: A) H 2 0 + 0 2 B) 2H 2 0 + O 2

39. Answer 4 – 30 B) 2H 2 0 + O 2 Remember conservation of mass!!! 2H 2 O 2  2H 2 0 + O 2

40. Question 4 - 40 How does temperature affect the rate of chemical reactions?

41. Answer 4 – 40 Increasing temperate increases the rate of chemical reaction.

42. Question 4 - 50 What is a catalyst?

43. Answer 4 – 50 A substance the increases the rate of chemical reactions.

44. Question 5 - 10 When aluminum is placed in copper II sulfate it bubbles and a precipitate forms. Which metal is more reactive?

45. Answer 5 – 10 Aluminum

46. Question 5 - 20 What is the atomic number of carbon?

47. Answer 5 – 20 6

48. Question 5 - 30 What determines the reactivity of an element?

49. Answer 5 – 30 Its valence electrons.

50. Question 5 - 40 How many covalent bonds can nitrogen form?

51. Answer 5 – 40 Nitrogen has 5 valence electrons. It will form three covalent bonds to obtain a full outermost energy level.

52. Question 5 - 50 Draw a lewis dot diagram for CH 2 O

53. Answer 5 – 50