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Chemistry 160 > Chapter 4 > Flashcards

Chapter 4 Flashcards

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1
Q

Write a dissociation equation for ammonium sulfate
in water, and predict what amount (mol) of each ion
will form from 5.0 mol of ammonium sulfate.

A

dissociation equation: (NH4)2SO4(s) —> 2NH4+ (aq) + SO42- (aq)
10 mols of NH4+
5 mols of SO42-

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2
Q

how do you find molarity?

A

mol/L

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3
Q

What is the molarity of an aqueous solution that contains
0.715 mol of glycine (H2NCH2COOH) in 495 mL?

A

1.44 M of glycine

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4
Q

How many grams of solute are in 1.75 L of 0.460 M
sodium monohydrogen phosphate buffer solution?

A

114g Na2HPO4

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5
Q

“Isotonic saline” is a 0.15 M aqueous solution of NaCl. How
would you prepare 0.80 L of isotonic saline from a 6.0 M
stock solution?

A

0.020 L
to prepare the solution, you would take 0.020 L of 6.0M stock and add 0.78L of water to get 0.80L of the 0.15M solution

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6
Q

Calculate the final volume (L) of a 0.0700 M solution
prepared by diluting 18.0 mL of 0.155 M lithium
carbonate with water

A

0.0399 L

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7
Q

In a simulation mercury removal from industrial wastewater,
0.050 L of 0.010 M mercury(II) nitrate reacts with 0.020 L of
0.10 M sodium sulfide to form mercury(II) sulfide and sodium
nitrate. How many grams of mercury(II) sulfide form?

A

0.12 g HgS

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8
Q

why is PbI2 insoluble?

A

because there is a stronger electrostatic attraction than water

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9
Q

are group 1A and NH4+ compounds insoluble or soluble?

A

soluble

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10
Q

nitrates, acetates, chlorates. insoluble or soluble?

A

soluble

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11
Q

chlorides, bromides, iodides. insoluble or soluble?

A

soluble

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12
Q

Ag+, Pb2+, Cu+, Hg2+, Hg22+. insoluble or soluble?

A

insoluble

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13
Q

flourides. insoluble or soluble?

A

soluble

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14
Q

Pb2+, group 2A. insoluble or soluble?

A

insoluble

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15
Q

sulfates. insoluble or soluble?

A

soluble

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16
Q

hydrogen carbonates. insoluble or soluble?

A

soluble

17
Q

carbonates, chromates, and phosphates. insoluble or soluble?

A

insoluble

18
Q

sulfides. insoluble or soluble?

A

insoluble

19
Q

Na2CO3. insoluble or soluble?

A

soluble because Na2 is in group 1A

20
Q

NH4OH. insoluble or soluble?

A

soluble because NH4 is soluble

21
Q

Co(NO3)3. insoluble or soluble?

A

soluble because nitrate is soluble

22
Q

Pb2CO3. insoluble or soluble?

A

insoluble because carbonate is insoluble

23
Q

Mg(OH)2. insoluble or soluble?

A

insoluble because hydroxide is insoluble

24
Q

AgHCO3. insoluble or soluble?

A

soluble because all bicarbonates are soluble

25
Q

How many H+(aq) ions are in 25.3 mL of 1.4 M nitric acid?

A

2.13 x 10^22 H+ ions

26
Q

what causes a reaction to be double displacement

A

when the cations switch places

27
Q

A 50.00 mL sample of HCl is titrated with 0.1524 M NaOH.
The buret reads 0.55 mL at the start and 33.87 mL at the end
point. Find the molarity of the HCl solution.

A

0.1016M HCl

28
Q

oxidation is

A

the loss of electrons, making it more positive

29
Q

reduction is

A

the gain of electrons, making it more negative

30
Q

what does a redox reaction involve

A

an electron transfer

31
Q

O.N. for a monoatomic ion

A

the ions charge

32
Q

O.N. for an atom is its elemental form( Na, O2, Cl2, etc.)

A

0

33
Q

O.N. for group 1A

A

+1

34
Q

O.N. for group 2A

A

+2

35
Q

O.N. for fluorine

A

-1

36
Q

O.N. for hydrogen

A

+1 when bound to non metals, and -1 when bonded to metals and boron

37
Q

O.N. for oxygen

A

-2, and -1 when in peroxides(H2O2, Na2O2)

38
Q

O.N. for Cl, Br, and I

A

-1 except when bound to O and with other halogens with the smaller period number, BrCl3: Cl = -1 and Br = +3 (bigger is positive, smaller is negative)

39
Q

what type of reaction is C6H14(l) + O2(g) –> CO2(g) +H2O(g)

A

combustion reaction

Chemistry 160 (12 decks)

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