1. Quiz Matter and Energy

2.  1. Draw Carbon’s Bohr Model and label the protons, neutrons and electrons with arrows.

3.  2. There is an element that has Atomic # 8, it has 8 protons, 8 electrons and 8 neutrons.  Find the mass.

4.  3. There is an unknown element that has 4 protons and its mass is 9 amu.  How many electrons does it have?

5.  4. There is an unknown element with a mass of 31 amu, and also has the atomic # 15.  Find the number of electrons for this atom.

6.  5. Find the number of neutrons of an element that has a mass of 39.9 amu, 18 electrons and 18 protons.

7.  6. Which are the groups with the highest reactivity?  7. Which group has the lowest reactivity?

8.  8. What is more reactive, an element with 1 shell, or and element with 6 shells?

9.  9. Where are Valence electrons located ?

10.  10. Which element has 3 valence electrons on period 2?  11. Which element has 1 valence electrons on period 2?  12. Which element has 7 valence electrons on period 3?

11.  13. Which of the following are Similar:  C, Ne, Kr, Xe, Li 

12.  14. Which element has 4 shells?  Be, Ca, Na, He

13.  15. Count the number of elements in the following formula:  C 2 H 6 O 5  16. count the number of atoms in the following formula:  3C 2 OOH (KCl) 3

14.  17. Is the following formula balanced or unbalanced?  2Na+MgF2  2NaF+Mg  18. Is the following formula balanced or unbalanced?  Cl2 + 2KI  KCl + I2

15.  19. Which subatomic particles are attracted to the nucleus?  20. I mixed two solutions and a yellow precipitate appeared at the bottom of the flask, is this a physical or chemical change?

16.  ANSWERS

17. 11.Li Lithium 12.Cl Chlorine 13.Ne, Kr, Xe 14.Ca calcium 15.3 16.33 17.Balanced 18.Unbalanced 19.Electrons 20.Chemical 1.I will look at it and grade it myself. 2.16 amu 3.4 electrons 4.15 electrons 5. 22 neutrons 6.1 and 17 7.18 8.6 shells 9.last shell 10.B Boron