Test of Facts and Concepts Solutions CH1 to 4

# Test of Facts and Concepts Solutions CH1 to 4 - 1 Test of...

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Test of Facts and Concepts Chapters 1 – 4 577 1. (a) 24.6 cm 3 sig. fig. 0.35140 m 5 sig fig 7,424 mm 4 sig. fig. (b) vol = 24.6 cm × 0.35410m 100 cm 1 m × 7.424 mm 1 cm 10 mm = 64.6 cm 3 (c) # ft 3 = 64.7 cm 3 1 ft 30.48 cm 3 = 2.12 ft 3 (d) # kg = 64.7 cm 3 7.140 g 1 cm 3 1 kg 1000 g = 0.462 kg 2. An atom is the smallest representative sample of an element while a molecule is the smallest representative sample of a compound. Molecules are made of atoms. A mole is a unit of measure for the amount of a substance; 6.022 × 10 23 things are in a mole. 3. The atomic mass of element X is half the size of the atomic mass of element Y. 4. According to Dalton's atomic theory, a chemical reaction is simply a reordering of atoms from one combination to another. If no atoms are gained or lost and if the masses of the atoms cannot change, then the mass after the reaction must be the same as the mass before. For the law of definite proportions, the theory states a given compound always has atoms of the same elements in the same numerical ratio. The same mass ratio would exist regardless of how many molecules were in the sample. 5. A and B do not necessarily need to be the same element. They could be two different elements with the same number of neutrons by coincidence. 6. # cm 3 = 3.14 ft 3 30.48 cm 1 ft 3 7. 94 204 Pu 94 244 Pu 8. Protons: 28 Neutrons 32 Electrons 28 9. 11 23 Na + 10. (a) ion particle (b) mixture substance (c) isotope substance (d) atom particle (e) compound substance (f) molecule particle (g) element substance (h) nucleus particle 11. (a) An isotope of iron Possible (b) An atom of iron Not possible – atoms cannot be seen by eye (c) A molecule of water Not possible – water molecules are too small to be seen by eye (d) A mole of water Possible (e) An ion of sodium Not possible – Na + is too small to be seen (f) A formula unit of sodium chloride Not possible – one NaCl is too small to be seen.

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Test of Facts and Concepts Chapters 1 – 4 578 12. METALS NONMETALS METALLOIDS 13. Zr and Hf 14. Calcium Alkaline earth metal Iron Transition metal Helium Noble gas Gadolinium Inner transition metal Iodine Halgen Sodium Alkali metal 15. Ductile is the ability to be drawn into wire.
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## This note was uploaded on 01/12/2012 for the course CHEM 103 taught by Professor Jeffashley during the Fall '10 term at Philadelphia.

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Test of Facts and Concepts Solutions CH1 to 4 - 1 Test of...

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