Unit 6 Test Review

Electronegativity Know the Definition of Electronegativity Know the Definition of Electronegativity  The relative attraction of the electrons in a chemical bond Know the Periodic Table Trends Know the Periodic Table Trends  Left to Right – Increases  Top to Bottom - Decreases Atomic Radii Trends Atomic Radii Trends  Left to Right – Decreases  Top to Bottom – Increases

#1-3 #1 Which of the following elements is the most electronegative? #1 Which of the following elements is the most electronegative?  C) Fluorine (F) #2 Which one of these statements is true? #2 Which one of these statements is true?  B) Atoms with a smaller radii are more electronegativity #3 The periodic Trend for Electronegativity Values. #3 The periodic Trend for Electronegativity Values.  B) Decreases going down, increases across

Polarity Polar Polar  Unequal pull between the shared electron(s) Non Polar Non Polar  Equal pull between the shared electron(s)

#4-7 #4 Which molecule is polar? #4 Which molecule is polar?  A) Water #5 Which molecule has a nonpolar bond? #5 Which molecule has a nonpolar bond?  D) Ozone O 3 #6 Which of the following is a polar covalent bond? #6 Which of the following is a polar covalent bond?  G) C=O #7 Which type of bond is formed between the two N atoms in N 2 gas? #7 Which type of bond is formed between the two N atoms in N 2 gas?  G) Nonpolar Covalent

Mole Conversions Always use the Balanced Equation Always use the Balanced Equation Remember that you have to convert to moles FIRST before using a ratio Remember that you have to convert to moles FIRST before using a ratio Want Want Given Given

#8-9 #8 How many moles of ammonia are produced from 3 moles of nitrogen gas? #8 How many moles of ammonia are produced from 3 moles of nitrogen gas?  N 2 + 3H 2  2NH 3  3 x 2 = 6 (C ) 1 #9 How many grams of fluorine gas are required to react with 14.0 g nitrogen gas? #9 How many grams of fluorine gas are required to react with 14.0 g nitrogen gas?  N 2 + 3F 2  2NF 3  14g N 2 =.5 mole N 2 .5 x 3 = 1.5 moles Fluorine = 57 grams Fluorine 1 (C) 1 (C)

Reaction Types 10 a) SO 2 + H 2 O  H 2 SO 3 10 a) SO 2 + H 2 O  H 2 SO 3  Synthesis b) 2N 2 O 5  2N 2 + 5O 2 b) 2N 2 O 5  2N 2 + 5O 2  Decomposition c) Na 2 SO 4 + Pb  PbSO 4 + 2Na c) Na 2 SO 4 + Pb  PbSO 4 + 2Na  Single Replacement d) KOH + HNO 3  KNO 3 + H 2 O d) KOH + HNO 3  KNO 3 + H 2 O  Double Replacement

Reaction Types 11 a) 2CrCl 3 + 3I 2  2CrI 3 + 3Cl 2 11 a) 2CrCl 3 + 3I 2  2CrI 3 + 3Cl 2  Single Replacement b) 2KClO 3  2KCl + 3O 2 b) 2KClO 3  2KCl + 3O 2  Decomposition c) 2Al + 3CuCl 2  3Cu + 2AlCl 3 c) 2Al + 3CuCl 2  3Cu + 2AlCl 3  Single Replacement d) Al 2 O 3 + 3H 2 S  Al 2 S 3 + 3H 2 O d) Al 2 O 3 + 3H 2 S  Al 2 S 3 + 3H 2 O  Double Replacement

Like Dissolves Like Polar Substances dissolve in Polar Substances. Polar Substances dissolve in Polar Substances. Nonpolar Substances dissolve in Nonpolar Substances. Nonpolar Substances dissolve in Nonpolar Substances.

# #12 Oil does not dissolve in water because #12 Oil does not dissolve in water because  D) Water is polar and oil is nonpolar #13 Which of the following will not dissolve in water? #13 Which of the following will not dissolve in water?  C) I 2

Separating Ink #14 Which method would be best for separating the pigments in ink? #14 Which method would be best for separating the pigments in ink?  B) paper chromatography (B)

Gas Laws Charles’ Law Charles’ Law  V1 = V2 T1 = T2 T1 = T2 Boyle’s Law Boyle’s Law  P 1 V 1 = P 2 V 2

#15-16 #15 When a 10.0 L sample of CH 4 is heated from 200K to 400 K and pressure remains constant, the volume of gas is… #15 When a 10.0 L sample of CH 4 is heated from 200K to 400 K and pressure remains constant, the volume of gas is…  10.0/200 = V/400  V = 20.0 L The volume doubles (C) # 16 Which mathematical relationship remains constant? # 16 Which mathematical relationship remains constant?  P X V (A)

Solubility Curves Skip these for now, we’ll use the overhead Skip these for now, we’ll use the overhead

Kelvin 0 degrees Celsius = 273 Kelvin 0 degrees Celsius = 273 Kelvin #21 A liquid sample has a temperature of 40 degrees C, what is the temperature in Kelvin? #21 A liquid sample has a temperature of 40 degrees C, what is the temperature in Kelvin?  = 313 K (D)

STP Moles to Liters 22.4 Liters in 1 mole (no matter what the compound is) 22.4 Liters in 1 mole (no matter what the compound is) #22 at STP what is the volume of 51.0 grams of NH 3 #22 at STP what is the volume of 51.0 grams of NH 3  Convert to moles: 51/17 = 3 moles  3 moles x 22.4 = 67.2 (A)

You will NOT be able to use… Mole Road! Mole Road! Pink Gram to Gram Conversion Pink Gram to Gram Conversion Here’s a Trick… Here’s a Trick…  Be able to draw them out yourself so when you get your test you can draw them on the test and use them that way!