+/66 TOTAL Name: _______________________________ States of Matter Unit Test DIRECTIONS: Answer the questions below to the best of your ability! Make sure that you have 5 pages and that the last question is question 18. I believe in you, you got this, good luck!! TRY EVERYTHING, LEAVE NOTHING BLANK. As a reminder to what we have been working towards, our unit goal is: SWBAT XX SECTION I: MULTIPLE CHOICE Circle the BEST answer to the question given. [2 points each – 16 points total] 1. Barium has __ valence electrons. a. 2 b. 4 c. 6 d. 8 2. The outermost shell of a Bohr model is called the ______________. a. Valence Electron b. Valence Shell c. Chemical Change Shell d. 3rd Energy Level. 3. Which element follows the duet rule? a. Helium b. Hydrogen c. Boron d. Carbon 4. The octet rule states __________. a. An element needs 2 valence electrons to be happy. b. An element needs 8 valence electrons to be happy. c. You have to fill every orbital before you start pairing electrons. d. None of the above. 5. The atomic number tells us ______. a. The number of electrons b. The number of protons c. The number of neutrons d. Both a and b e. Both b and c 6. A chemical change is ___________. a. When a chemical combines with another substance to form a new substance. b. When a substance changes but still retains its chemical properties. c. When it shares valence electrons with another element. d. Both a and b. e. Both a and c. 7. Water evaporating is an example of a ____________. a. Physical Change b. Chemical Change c. Melting d. None of the above. 8. The location where electrons go are called _________? a. Orbitals b. Valence shells c. Electron spaces d. Mr. Lopez’s classroom. Page 1 of 5 SECTION II: MATCHING Classify the scenario as a chemical or physical change and EXPLAIN your thinking in 2 sentences. [3 points each - 12 points total] 9. Mr. Lopez always has too much paper on his desk so he decides to shred some of the paper. TYPE OF CHANGE: _________________. EXPLANATION: 10. It’s the 4th of July and we can all see fireworks lighting up the night sky! TYPE OF CHANGE: ________________. EXPLANATION: 11. Miss Angela is making breakfast in the morning and accidentally leaves some eggs out. She finds them two months later and finds that they have rotted. TYPE OF CHANGE: ________________. EXPLANATION: 12. Jacob, Mr. Lopez’s baby brother, likes to play with clay. Jacob rips the clay in to halves. TYPE OF CHANGE: _______________. EXPLANATION: Page 2 of 5 SECTION III: BOHR MODELS Answer the following questions about drawing Bohr models. [20 points total] 12. What is the pairing rule when drawing Bohr Models? [2 points] 13. The element is Oxygen [6 points] 13a. What is the total number of 13b. Draw the Bohr Model of this element here. LABEL THE VALENCE SHELL. ELECTRONS: ______ PROTONS: _______. NEUTRONS: _______. 14. The element is Aluminum. [6 points] 14b. Draw the Bohr Model of this element here. LABEL THE VALENCE SHELL. 14a. What is the total number of ELECTRONS: ______ PROTONS: _______. NEUTRONS: _______. 15. The element is Hydrogen [6 points] 15a. What is the total number of 15b. Draw the Bohr Model of this element here. LABEL THE VALENCE SHELL. ELECTRONS: ______ PROTONS: _______. NEUTRONS: _______. Page 3 of 5 SECTION IV: DRAWING COMPOUNDS Follow the directions given per question about drawing the compounds. [18 points total – 6 points each]. 16. The compound is Br2. 16a. Draw the Lewis dot structure of ALL the elements in the compound. [2 points] 16b. List the total number of VALENCE ELECTRONS in the compound. [2 points] 16c. Draw the compound. MAKE SURE IT LOOKS NEAT! HINT: A BOND IS TWO ELECTRONS. [2 points] 17. The compound is SH2. 17a. Draw the Lewis dot structure of ALL the elements in the compound. [2 points] 17b. List the total number of VALENCE ELECTRONS in the compound. [2 points] 17c. Draw the compound. MAKE SURE IT LOOKS NEAT! HINT: A BOND IS TWO ELECTRONS. [2 points] Page 4 of 5 18. The compound is HCN. 18a. Draw the Lewis dot structure of ALL the elements in the compound. [2 points] 18b. List the total number of VALENCE ELECTRONS in the compound. [2 points] 18c. Draw the compound. MAKE SURE IT LOOKS NEAT! HINT: A BOND IS TWO ELECTRONS. [2 points] Page 5 of 5