Name:____________ Period:_________ Chemical Bonds Quiz California Standards Chemistry 1d. Students know how to use the periodic table to determine the number of electrons available for bonding Chemistry 2 a. Students know atoms combine to form molecules by sharing electrons to form covalent or metallic bonds or by exchanging electrons to form ionic bonds Chemistry 2b. Students know chemical bonds between atoms in molecules such as H2, CH4, NH3, H2CCH2, N2, Cl2, and many large biological molecules are covalent. Chemistry 2c. Students know salt crystals, such as NaCl are repeating patterns of positive and negative ions held together by electrostatic attraction. Multiple Choice- Each worth 1 point. There is only one correct answer for each question, mark the BEST possible answer. 1. (Chem 1d) Which of the following atoms has six valence electrons? A. Magnesium (Mg) B. Silicon ( Si) C. Sulfur ( S) D. Argon ( Ar) 2. ( Chem 1d) How many valence electrons do group 14 elements have? A. 1 B. 3 C. 4 D. 6 3. (Chem 1d) Which element has 5 valence electrons and can form 3 bonds? A. Silicon B. Magnesium C. Phosphorus D. Neon 4. ( Chem 2a) When anions and cations join, they form what kind of chemical bond? A. Ionic B. Metallic C. Polar Covalent D. Non-Polar Covalent 5. ( Chem 2a) Which of the following pairs of elements can be joined by a polar covalent bond? A. Li and Br B. N and C C. Mg and C D. B and F 6. ( Chem 2a) Which of the following pairs of elements can be joined by a non-polar covalent bond? A. Li and Br B. N and C C. Mg and C D. B and F 7. (Chem 2a) What is the best description of what happens to the electrons in a bond between two metals, a metallic bond? A. Electrons are shared equally between two metal atoms B. Electrons are transferred between the two metal atoms C. Electrons are transferred from the metal atoms to the outside of the atoms, thus forming an electron “fluid” around the metal cations. D. Electrons are shared unequally between the two metal atoms 8. ( Chem 2a) Match the picture with the type of bond that it represents 11. ( Chem 2b) Match the picture with the type of bond that it represents A. Polar Covalent Bond B. Non-Polar Covalent Bond C. Metallic Bond D. Ionic Bond A. Polar Covalent Bond B. Non-Polar Covalent Bond C. Metallic Bond D. Ionic Bond 9. ( Chem 2b) Some molecules found in the body are NH2CH2COOH and CH3 (CH2)16COOH. The bonds they form are A. Nuclear B. Metallic C. Ionic D. Covalent 12. ( Chem 2b) Match the picture with the type of bond that it represents 10. Table of Common Molecules Name Hydrogen Chlorine Molecular H2 Cl2 Formula Ammonia NH3 (Chem 2b) What type of bond do all of the molecules in the table above have in common? A. Covalent B. Ionic C. Metallic D. Polar A. Polar Covalent Bond Bond Methane B. Non-Polar Covalent CH C.4 Metallic Bond D. Ionic Bond 13. (Chem 2c) The reason that salt crystals, such as KCl, hold together so well is because the cations are strongly attracted to A. the protons in the neighboring nucleus B. free electrons in the crystals C. neighboring anions D. neighboring cations 14. (Chem 2c) What type of force hold an ionic bond? A. Nuclear attraction B. Electrostatic Attraction C. Hydrogen Bonding Attraction D. Dipole-Dipole Attraction 15. ( Chem 2c) Match the picture with the type of bond that it represents A. Polar Covalent Bond B. Non-Polar Covalent Bond C. Metallic Bond D. Ionic Bond Short Answer Questions- Each worth 5 Points- Answer all parts of the question to receive credit, show all your work. 16. (Chem 1d) Complete the table below Group 1 2 13 14 15 16 17 18 Example of # Valence an Element in Electrons this group Lewis Dot Structure How many bonds can it make 17. ( Chem 2a) Complete the table below Bond What happens to the electrons when bonding? Draw Picture Ionic Covalent Metallic 18. (Chem 2b) Complete the table below Bond Polar Covalent Non-Polar Covalent Example( Give two atoms that will form this type of bond How big is the difference in electronegativity between the two atoms?, small, medium, very large Are the electrons shared equally between the two atoms? Yes, No Shell Model Lewis Dot Structure Number of Neutron Number of Valence Electrons Number of electrons Number of Protons Atomic Mass Atomic Number Atom 19. (Chem 2c) Complete the table below Sulfur (S) Sulfur anion (S -2) 20. Extra Credit ( 5 points) Give me two examples where we have seen electrostatic attraction in this course.