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Unformatted text preview: Ison CH101 Name:_________, ___________ last, first Chapter 1 Worksheet Extra end-of-chapter practice problems in Ch1: 5, 7, 9, 19, 21, 23, 25, 29, 35, 45, 47, 49, 53 Answer the following: 1. What are the formulas and states of matter (gas, liquid, solid) of the following elements? chlorine _______ oxygen _______ copper _______ nitrogen _______ carbon _______ bromine _______ 2. A common notation used for atoms and ions is n A Z X Define A, Z and n. 3. In the notation above, the value of Z is often omitted. How can you obtain that value for 4 13 + C ? What is the number of protons, neutrons and electrons for the C atom shown? Is this a cation or anion? 4. How are two isotopes of an atom/ion different? How are they the same? 5. How many eggs in one dozen? How many eggs in one mole? 6. How many eggs in 5 dozen? How many eggs in 5 moles? Conversions Grams of substance Moles of substance Number of particles Molar mass (g/mol) Avogadros # (6.022x10 23 particles / mol ) Grams of substance Moles of substance Number of particles Molar mass (g/mol) Avogadros # (6.022x10 23 particles / mol ) We will use the unit factor method for conversions. The key is to set up your equation so that the conversion factor cancels the unwanted units and you are left with the desired units. Ison CH101 Name:_________, ___________ last, first Example I: Q: How many moles of CaCO 3 are there in 5.36g CaCO 3 ? A: We are asked to convert mass to moles which means we need to use the molar mass of CaCO 3 in g/mol as the conversion factor. The unwanted units are grams (mass) and desired units are moles so we will multiply the mass by the reciprocal of the molar mass. So first we calculate the molar mass of CaCO 3 , and then set up the equation so that unwanted units cancel. M m (CaCO 3 ) = 100g/mol Practice I: Q: What is the mass of 0.31 mol CaCO 3 ?...
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- Spring '08
- States Of Matter