Unit2+ReviewGUIDE

TOPIC 1 - know the WHMIS symbols and what they stand for - know the organization of matter (p.97)  o what are the two types of mixtures?  o what are they different kinds of mechanical mixtures?  o what holds emulsions together?  TOPIC 2 - know the difference between a physical change and a chemical change and be able to give examples of each - what are the two main ways to tell a chemical change from a physical change? - be able to tell the difference between physical properties of matter and chemical properties of matter (p.104 table) TOPIC 3 - what is the law of conservation of mass? (think back to the lab we did with the steel wool in the copper(II)sulphate solution) - what is the difference between an element and a compound? - know what an atom looks like and it’s different parts (what is in the nucleus? what is in the cloud?), and how the parts differ (what charges does each have?) TOPIC 4 - what are the three different kind of elements and how do their properties differ between one another? (table p.118) - what is a chemical family? - what are the four main chemical families we discussed in class? Be able to identify where each of these families are on the periodic table TOPIC 5 - using the periodic table be able to identify the following of each element: atomic number, atomic mass, the number of electrons, the number of neutrons, the number of protons Ex.
 * UNIT 2 Review Guide – Matter and Chemical Change **

47 Ag 107.9 silver

number of protons = Atomic number = 47

number of neutrons = Atomic Mass - # protons = 107.9 - 47 = 108 - 47  = 61  number of electrons = # protons = 47

*** BONUS: What is the mass of the following compound? NH3 To solve this problem you must add up the __atomic masses__ of each ATOM. You must look at your periodic table and see that the atomic mass of N is 14.007 You can also see that the atomic mass of H is 1.008 To find the TOTAL mass you have to add up the mass of each atom: You have one ATOM of N so the mass is just 14.007 for the first element You have three ATOMS of H, so the mass is 1.008 + 1.008 + 1.008 = 3.024 Add up the two masses to get the total mass for the COMPOUND: 14.007 + 3.024 = 17.031 So, the mass of the compound NH3 is 17.031 TOPIC 6 <span style="margin-bottom: .0001pt; margin-bottom: 0cm; mso-add-space: auto; mso-list: l0 level1 lfo1; text-indent: -18.0pt;">- how can you tell whether or not a compound is ionic or molecular? <span style="margin-bottom: .0001pt; margin-bottom: 0cm; mso-add-space: auto; mso-list: l0 level1 lfo1; text-indent: -18.0pt;">- how do the properties of ionic and molecular compounds differ? (p.136 table) <span style="margin-bottom: .0001pt; margin-bottom: 0cm; mso-add-space: auto; mso-list: l0 level1 lfo1; text-indent: -18.0pt;">- what is a binary compound? <span style="margin-bottom: .0001pt; margin-bottom: 0cm; mso-add-space: auto; mso-list: l0 level1 lfo1; text-indent: -18.0pt;">- be able to write the names of ionic compounds: <span style="margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 72.0pt; margin-right: 0cm; margin-top: 0cm; mso-add-space: auto;">Ex. ** CaCl2 ** <span style="margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 72.0pt; margin-right: 0cm; margin-top: 0cm; mso-add-space: auto;">Write the name of the first element: calcium <span style="margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 72.0pt; margin-right: 0cm; margin-top: 0cm; mso-add-space: auto;">Write the name of the second element, changing the ending to ide: <span style="margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 72.0pt; margin-right: 0cm; margin-top: 0cm; mso-add-space: auto;"> Chloride So, the compound is called ** calcium chloride ** <span style="margin-bottom: .0001pt; margin-bottom: 0cm; mso-add-space: auto; mso-list: l0 level1 lfo1; text-indent: -18.0pt;">- be able to write the names of molecular compounds <span style="margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 36.0pt; margin-right: 0cm; margin-top: 0cm; text-indent: 36.0pt;">Ex. ** NH4 ** <span style="margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 36.0pt; margin-right: 0cm; margin-top: 0cm; text-indent: 36.0pt;">Write the name of the first element: nitrogen <span style="margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 3.0cm; margin-right: 0cm; margin-top: 0cm; text-indent: -14.15pt;">Write the prefix (the number of atoms of nitrogen), if it is NOT one: in this case, we only have one atom of nitrogen, so we don’t write a prefix <span style="margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 36.0pt; margin-right: 0cm; margin-top: 0cm; text-indent: 36.0pt;">Write the name of the second element with ending ide: hydride <span style="margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 36.0pt; margin-right: 0cm; margin-top: 0cm; text-indent: 36.0pt;">Write the prefix (the number of atoms of hydrogen): tetrahydride <span style="margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 36.0pt; margin-right: 0cm; margin-top: 0cm; text-indent: 36.0pt;">So, the compound is called ** nitrogen tetrahydride ** <span style="margin-bottom: .0001pt; margin-bottom: 0cm; mso-add-space: auto; mso-list: l0 level1 lfo1; text-indent: -18.0pt;">- be able to write the chemical symbols for ionic compounds: <span style="margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 36.0pt; margin-right: 0cm; margin-top: 0cm; text-indent: 36.0pt;">Ex. What is the chemical symbol for a compound of iron (II) chloride? <span style="margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 36.0pt; margin-right: 0cm; margin-top: 0cm; text-indent: 36.0pt;">Note that the (II) means the charge of one iron atom in this case is +2, using your periodic table you can see that the charge of chlorine is -1. So… after we balance the charges: <span style="margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 36.0pt; margin-right: 0cm; margin-top: 0cm; text-indent: 36.0pt;">Fe2+ Cl- <span style="margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 36.0pt; margin-right: 0cm; margin-top: 0cm; text-indent: 36.0pt;"> <span style="margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 36.0pt; margin-right: 0cm; margin-top: 0cm; text-indent: 36.0pt;">So, there is 1 atom of Fe, and two atoms of Cl, the chemical symbol is FeCl2 TOPIC 7 <span style="margin-bottom: .0001pt; margin-bottom: 0cm; mso-add-space: auto; mso-list: l0 level1 lfo1; text-indent: -18.0pt;">- be able to identify reactants and products in a chemical reaction <span style="margin-bottom: .0001pt; margin-bottom: 0cm; mso-add-space: auto; mso-list: l0 level1 lfo1; text-indent: -18.0pt;">- know the difference between an endothermic and an exothermic reaction (remember that endothermic means we add energy, or take energy from our surrounding environment, so the environment will get colder; on the other hand, exothermic means we are releasing energy and so the surrounding environment will get warmer) <span style="margin-bottom: .0001pt; margin-bottom: 0cm; mso-add-space: auto; mso-list: l0 level1 lfo1; text-indent: -18.0pt;">- know examples of endothermic and exothermic reactions <span style="margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 36.0pt; margin-right: 0cm; margin-top: 0cm; text-indent: 36.0pt;">Ex. antacid tablet added to water is an ENDOthermic reaction <span style="margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 36.0pt; margin-right: 0cm; margin-top: 0cm; text-indent: 36.0pt;">Ex. a candle burning is an EXOthermic reaction TOPIC 8 <span style="margin-bottom: .0001pt; margin-bottom: 0cm; mso-add-space: auto; mso-list: l0 level1 lfo1; text-indent: -18.0pt;">- know how reactions rates of chemical reactions can be sped up or slowed down (how does temperature, particle size, and concentration play a role?) <span style="margin-bottom: .0001pt; margin-bottom: 0cm; mso-add-space: auto; mso-list: l0 level1 lfo1; text-indent: -18.0pt;">- what is the difference between corrosion and combustion? UNIT 2 EXAM 29 Multiple Choice 2 Numerical Response 4 Short Answer /35 <span style="margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 36.0pt; margin-right: 0cm; margin-top: 0cm; text-indent: 36.0pt;"> <span style="margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: 36.0pt; margin-right: 0cm; margin-top: 0cm; text-indent: 36.0pt;">