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SGM Whiteboard Review Fall 2018
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Draw a bohr model of Ca
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How many protons, neutrons, and electrons are in titanium?
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P: 22 N: 26 E:22
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What are isotopes? How do you use isotopes in average atomic mass?
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The average atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance
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Write the electron configuration for phosphorus.
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1s2 2s2 2p6 3s2 3p3
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Why does oxygen have a -2 charge? Hint: electron configuration
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1s2 2s2 2p4 To have a full octet, oxygen needs to gain 2 electrons
1s2 2s2 2p4 To have a full octet, oxygen needs to gain 2 electrons. This makes it have 2 more electrons than protons; making it a -2 charge
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Explain the steps of the flame test. (where does the light come from)
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Light comes from the electron moving from an excited state to a lower state; the energy released is in the form of light.
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What happens to the atomic radius as you go from Cl to Na
What happens to the atomic radius as you go from Cl to Na? Going down a group?
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Name H2SO3
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Sulfurous acid
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Name HF
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Hydrofluoric acid
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Name Cu(CN)3
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Copper (III) cyanide
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Name N5H9
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Pentanitrogen nonahydride
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Name Cr2(SO4)3
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Chromium (III) sulfate
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Name SO3
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Sulfur trioxide
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Rank the following bonds from least to most polar. SiO Cl2 HF
Element Electronegativity Cl 2.8 H 2.1 F 4.0 Si 2.0 O 1.8 Rank the following bonds from least to most polar. SiO Cl2 HF
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SiO: 2.0-1.8= 0.2 Cl2: 1.8-1.8=0 HF:4.0-1.0=3.0 Cl2, SiO, HF
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Which has a higher boiling point? CH4 or LiCl
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LiCl because it is ionic Ionic bonds have higher boiling/melting points than covalent bonds
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Rank the IMF’s in decreasing boiling/melting point
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HB>D-D>LD
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Write the balanced chemical equation: lithium reacts with copper(I)sulfide
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2Li + Cu2S Li2S + 2Cu
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What are the products of potassium bromide reacting with iodide?
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KBr + I2 No reaction
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What are the products of AgNO3 and MgCl2?
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2AgNO3 and MgCl2 2AgCl + Mg(NO3)2
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What are examples of a chemical reaction?
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Bubbles forms precipitate forms burning change in temperature color change (how?)
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Which has a greater mass: 3.0 moles of CO2 or 3.0 moles of O2?
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3.0 moles of CO2 x (44g/mole) = 132 g 3.0 of O2 x (32g/mole) = 96 g
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What is the percent composition of hydrogen in water?
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H2O % H = 2.0/(2.0+16) x 100 = 11.1%
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What are the steps (poem) to calculate the empirical formula?
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Percent to mass Mass to moles Divide by small multiply till whole
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Once you have the Empirical formula, how do you calculate the molecular formula?
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You will be given molecular mass (g/mole) 1. Find the mass of your E.F. 2. Divide the molecular mass by the E.F. mass 3. Multiply the whole number (from #2) by the subscripts of the E.F.
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If 3.0 moles of HCl reacts with NaOH, how many grams of water will be produced?
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HCl + NaOH NaCl + H2O B 3. e. x. 0 C. -x. -x. +x. +x A. 0 x= 3. 0 3
HCl + NaOH NaCl + H2O B e.x C -x -x +x +x A 0 x= moles of water is produced x (18g/mole) 54 g of water is produced
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What are the steps to calculate the mass of an unknown metal
What are the steps to calculate the mass of an unknown metal? Think calorimetry
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1. Calculate the Q of water 2. Q of water = - Q of metal 3
1. Calculate the Q of water 2. Q of water = - Q of metal 3. solve for c of metal
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Describe the energy transfer at point A; point B
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At point A (solid), kinetic energy is increasing, potential is not changing At point B, the kinetic energy is not changing, but the potential energy is increasing to change from solid to liquid
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Why does the volume change?
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The temperature is increasing, making the particles move faster, which are hitting the sides of the container quicker, making the container get bigger
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What are the solubility factors? List them
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Smaller particles (increase particle size) Stirring Increase temperature
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If you want to make 300 mL of a 0
If you want to make 300 mL of a 0.1 M HCl solution, how much of the 10 M should you use? How much water should you use?
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10(x) = (0.1)(300) 3mL of 10M stock solution Amount of water: need to make 300 mL; use 3mL of 10M; water = 300 mL – 3 mL = 297 mL of water
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How does adding salt to water, affect the boiling point?
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Adding salt to water will interfere with the intermolecular forces between the water molecules, causing the boiling point to increase. The more solute, the higher the boiling point/lower the freezing point
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How does dissociation of a base affect its concentration?
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The higher the dissociation, the higher the concentration of the H+
The higher the dissociation, the higher the concentration of the H+. The higher the concentration, the lower the pH
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What are the products of the neutralization reaction between NaOH and H3PO3?
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Salt and water NaOH and H3PO3 Na3PO3 + H20
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