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Chemistry Unit 2

This practice test covers essential concepts in atomic structure and the periodic table, focusing on calculating protons, neutrons, electrons, and atomic mass. Each question aids in understanding isotopes, ions, electron configurations, and properties of elements. Students will engage in exercises such as identifying the number of protons in elements like Calcium and Silicon, understanding charge implications in ion formation, and recognizing relationships between elements on the periodic table. This resource is designed to enhance knowledge and test preparation in chemistry.

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Chemistry Unit 2

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  1. Chemistry Unit 2 Practice Test

  2. Indicator 1: Calculate PNE 1. Which atom contains exactly 30 protons? A. Ca – 30 B. Co – 59 C. Zn – 65 D. Br – 80 HINT: What is Element 30?

  3. Indicator 1: Calculate PNE 2. What is the total number of subatomic particles in a neutral atom of Beryllium? • 4 • 9 • 13 • 17 Hint: How many protons, neutrons and electrons does it have? Add them!

  4. Indicator 1: Calculate PNE 3. Compared to the charge and mass of an electrons, a proton has • The same charge and a smaller mass • The same charge and a greater mass • The opposite charge and a smaller mass • The opposite charge and a greater mass Make a Table to compare: Charge Mass Protons Electrons Then treat the answer choices like True/False.

  5. Indicator 1: Calculate PNE 4. Using the Periodic Table, how many neutrons would the most common isotope of Cobalt have? • 27 • 31 • 32 • 59 Hint: Look up Cobalt Element #27 – Mass 59 59 – 27 = ???

  6. Indicator 1: Calculate PNE 5. How many protons are in Si-28? • 42 • 28 • 14 • 2 Hint: Look up Si Element #14 So there are how many protons???

  7. Indicator 1: Calculate PNE 6. What is the atomic mass of an element with 17 electrons, 19 protons and 13 neutrons? • 32 • 30 • 19 • 13 Hint: Atomic mass is protons + neutrons 19 + 13 = ???

  8. Indicator 2: Ion / Isotope 7. Given Element A has 7 protons, 7 neutrons and 7 electrons and Element B has 6 protons, 7 neutrons and 8 electrons which statement is true? • Elements A and B have the same mass. • Element A and B have the same number of subatomic particles. • Elements A and B are isotopes of the same element. • Elements A and B have the same number of electrons in the outer energy level • Hint: Make a chart to compare A and B • P • N • E • Then – treat the answer choices like true/false.

  9. Indicator 2: Ion/Isotope 8. What is the isotope notation 2 for an element with 11 protons, 13 neutrons and 11 electrons? • Al-13 • Na-11 • Al-24 • Na-24 Hint: Isotope notation 2 is Symbol – Mass Symbol is the number of protons (11) = ??? [Sodium] Mass is protons + neutrons: 11 + 13 =???

  10. Indicator 2: Ions / Isotopes 9. What is the charge of an atom that has lost an electron? • 1+ • 1- • 2+ • 2- Hint: Loosing an electron creates a ??? Charge, gaining electrons create a ??? Charge – What charge do electrons have????

  11. Indicator 2: Ions / Isotopes 10. What is defined as having a different number of neutrons and therefore a different atomic mass? • An ion • An isotope • Stable • Element Hint : different neutrons = ???

  12. Indicator 3: Diagrams 11. How many electrons does Calcium have in its outer energy level? 2 4 8 10 Hint: Valence electrons = electrons in outer energy level.

  13. Indicator 3: Diagrams 12. An ion with 6 protons, 7 neutrons and a charge of 2+ would have how many electrons? A. 4 B. 6 C. 7 D. 8 Hint: 6 – 2+ = ???

  14. Indicator 3: Diagrams 13. In a filling the electron shells, where do electrons ‘go’ after you fill level 3p? • 3d • 4s • 2p • 2d Hint: Look at the Electron Configuration Chart!!!

  15. Indicator 4: Periodic Table 14. What element is in Group 13, Period 2? • Boron • Aluminum • Sodium • Magnesium Hint: Group is the column, period is the row – read the periodic table!

  16. Indicator 4: Periodic Table 15. Which element is a metal? • Potassium • Iron • Silicon • Bromine Hint: Look at the periodic table color coding – treat the answers like true/false.

  17. Indicator 4: Periodic Table 16. Carbon and Sulfur are similar in that they both • Have the same ionization energy • Are transition metals • Are non-metals • Are gases Hint: find Carbon and Sulfur – identify they are both Non-Metals – treat the answers like true/false.

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