19-3

**Review Worksheet** //<---Previous Assignment - Next Assignment--->media type="custom" key="16151036"// **__Instructions__** // On a new wiki titled __19-3__ put just your answers to the following questions //
 * __Time Length__ **
 * 5 Days

// **__Worksheet__** // 1) What factors will help a gas dissolve into a liquid (hot or cold, shaken or still, high or low pressure) 2) what factors will help a solid dissolve into a liquid (hot or cold, shaken or still, big pieces with small surface area or small pieces with big surface area) 3) 2Na + Cl 2 --> 2NaCl according to the equation above how much NaCl will you form if you have 100 g of Na? Take the question amount of sodium(100 g) divided by the equation amount of sodium (2 moles). Set that equal to the question amount of NaCl (X g) divided by the equation amount of NaCl (2 moles). Convert each moles amount to grams by finding the molar mass. (find the mass on the periodic table for each element if there is more than one and multiply it by the number of moles) Solve for x 4) According to the equation above how much sodium would you make if you had 40 g of Cl 2 ? 5) How many atoms are in 1 mole? (hint: its avagadros number. Google it) 6) How many atoms are in .68 moles? 7) What is an electrolyte? 8) Is salt water an electrolyte? 9) is sugar water an electrolyte? 10) A base releases Hydrogen Ions or Hydroxide Ions? 11) Is a solution with extra solute (the stuff getting dissolved) sitting on the bottom of a beaker that wont dissolve because it has dissolved as much as possible supersaturated, saturated, or unsaturated? 12) Mixing an acid and a base in equal amounts and concentrations neutralizes it. True or False. 13) Explain why oil and water do not mix. Use the words polar and nonpolar. 14) How do you make a supersaturated solution? (google if you do not know) 15) what pH numbers are for acids and which for bases? 16) Molarity is the number of moles divided by the number of liters. What is the molarity of 4 moles of HCl in 100 mL of solution? (Hint: how many liters is 100 mL?) 17) how many moles are in 100 g of HCl? Take the number of 1 mol = molar mass. To solve this set the question amount of HCl (100 g) divided by the molar mass of HCl (add it up from the periodic table) equal to the unknown number of moles (x mol) divided by 1 mol. 18) Using the number of moles found in #17, what is the molarity of 100 g of HCl in 500 mL of solution? (remember to convert mL to L) 19) According to Boyles law what will decrease when you increase the pressure on a gas? (its like squeezing it from all sides) 20) According to Gay-Lussac's Law what will happen if you heat a closed test tube? 21) Binary acids (which have two parts, Hydrogen and another nonmetal) are named Hydro__ic acid where the blank is part of the second element. For example HCl is Hydrochloric acid. So what is the name for H 3 N? 22) what is the percent composition of water? To answer this find the total mass of the element using the periodic table. Then divide the total weight of each element (the hydrogen part and the oxygen part) by the total weight of the whole molecule. Multiply answers by 100 to get percent. 23) define and give examples of the following types of reactions. Synthesis, Combustion, Single replacement, Double replacement, Decomposition. 24) On which side of a reaction are the products? The reactants? 25) at what temperature in Celsius does water melt? Boil? 26) figure out the charge of aluminum and oxygen. (+1,+2....,+3, +4, -3. -2, -1, 0) If you mix aluminum and Oxygen what would the formula of the product be? 27) A molecule and a compound are technically different. Molecules are formed covalently only, so if you see an ionic compound, it is not a molecule. So which of the following are molecules? (H 2 O, NH 3, CO 2 , NaCl) (Hint ionic compounds have a metal and a nonmetal) 28) when you name covalent molecules you use latin prefixes. For example CO 2 is Carbon Dioxide. So what is the name for the formula N 3 Br 5 ? (3 = tri, 5=penta).