hw2 - padilla (tp5647) HW02: Fundamentals Revision II shear...

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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 – fnd all choices be±ore answering. These questions test basic knowledge that you need ±or this course. You are welcome to consult your textbook ±or in±ormation to help do this homework, just be aware o± how much help you needed. Some questions *WILL* need you to look things up like atomic masses, ±undamental constants and unit conversions. 001 10.0 points The number 2 × 10 15 is 1. smaller than 2 . 0 × 10 - 15 . 2. More in±ormation 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 o± H 2 O and 5.00 mL o± liquid plant ±ood to make a solution ±or your plants. You ±orgot to bring a measuring cup out to the greenhouse, but you do have a scale and know that the density o± H 2 O is 1.00 g/cm 3 , the density o± liquid plant ±ood is 1.21 g/cm 3 and 1 cm 3 = 1 mL. How much o± the liquid plant ±ood 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 ±or 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 ±orm A Z E where E is the element symbol, A is the mass number (number o± protons plus the number o± neutrons) and Z is the atomic num- ber (number o± protons). I± the mass number is 64 and the number o± neutrons equals 35, then 64 35 = 29 is the number o± protons or the atomic number. Cu has an atomic number o± 29, so 64 29 Cu is the correct symbol. 004 10.0 points A chemical bond is ±ormed when electrons are 1. shared. 2. All o± 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 classi±ed 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
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hw2 - padilla (tp5647) HW02: Fundamentals Revision II shear...

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