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# ch02 - padilla(tp5647 HW02 Fundamentals Revision II...

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padilla (tp5647) – HW02: Fundamentals Revision II – shear – (52375) 1 This print-out should have 24 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. These questions test basic knowledge that you need for this course. You are welcome to consult your textbook for information to help do this homework, just be aware of how much help you needed. Some questions *WILL* need you to look things up like atomic masses, fundamental constants and unit conversions. 001 10.0 points The number 2 × 10 15 is 1. smaller than 2 . 0 × 10 - 15 . 2. More information is needed. 3. less than one. 4. greater than one. correct Explanation: 2 × 10 15 = 2 , 000 , 000 , 000 , 000 , 000 1 002 10.0 points You need 100.00 mL of H 2 O and 5.00 mL of liquid plant food to make a solution for your plants. You forgot to bring a measuring cup out to the greenhouse, but you do have a scale and know that the density of H 2 O is 1.00 g/cm 3 , the density of liquid plant food is 1.21 g/cm 3 and 1 cm 3 = 1 mL. How much of the liquid plant food would you use? 1. 4.13 g 2. 3.79 g 3. 6.21 g 4. 0.242 g 5. 6.05 g correct Explanation: (5 mL) · 1 cm 3 1 mL · 1 . 21 g cm 3 = 6 . 05 g 003 10.0 points Give the nuclide symbol for an atom that has mass number 64 and 35 neutrons. 1. 35 29 Br 2. 35 64 Cu 3. 99 64 Gd 4. 64 35 Cu 5. 35 64 Gd 6. 29 64 Cu 7. 99 35 Br 8. 29 64 Gd 9. 64 35 Br 10. 64 29 Cu correct Explanation: The standard nuclide symbol takes the form A Z E where E is the element symbol, A is the mass number (number of protons plus the number of neutrons) and Z is the atomic num- ber (number of protons). If the mass number is 64 and the number of neutrons equals 35, then 64 35 = 29 is the number of protons or the atomic number. Cu has an atomic number of 29, so 64 29 Cu is the correct symbol. 004 10.0 points A chemical bond is formed when electrons are 1. shared. 2. All of these correct 3. gained.

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padilla (tp5647) – HW02: Fundamentals Revision II – shear – (52375) 2 4. lost. Explanation: Bonding can occur in any of these ways. 005 10.0 points In the compound X 2 O the element X could be 1. silicon. 2. helium. 3. sodium. correct 4. magnesium. Explanation: To form a neutral compound X 2 O knowing that O has a charge 2 , each X needs to have an ion charge 1+. Of those listed, sodium is the only element that can have a 1+ charge. 006 10.0 points Zirconium (Zr) is classified as 1. a transition element. correct 2. a representative element. 3. a noble gas. 4. a lanthanide. 5. an actinide. Explanation: Zr is in Group IVB, which is a transition metal group. 007 10.0 points All of the following elements are composed of diatomic molecules under normal conditions, except 1. nitrogen.
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