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CHEM 1 > Multiple choice > Flashcards

Multiple choice Flashcards

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1
Q

Which of the following structures represents the conjugate acid of HPO 2- ?
A)H2PO4-.
B)H3PO4.
C) PO43-.
D) H2PO4.
E) PO42-.

A

H2PO4- (a)

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2
Q

The size of the colloid particles is between ……… and …………. nm.

A

1, 500

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3
Q

The solid-liquid (S/L) colloid dispersions are called

A

suspention

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4
Q

The liquid-liquid (L/L) colloid dispersions are called…

A

emulsion

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5
Q

Migration of the colloidal particles in an electrical field between two electrodes are called

A

electrophoresis

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6
Q

Write three different effects/things that can stabilize a colloid solution!

A
  1. charge
  2. ion absorption
  3. hydration
  4. colloids
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7
Q

The scattering of light by colloidal dispersion is called

A

tyndall effect

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8
Q

List four methods which can be used to coagulate a colloidal solution!!

A
  1. add salt
  2. heating
  3. electolysis
  4. add sodium chloride
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9
Q

What is the difference between a sol, a gel, and a xerogel? What does the “coherent” word mean?

A

sol: solution with particles
gel: coherent systmen
xerogel: no liquid (as solvent jsut solute)
coherent: molecules can meet together

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10
Q

All of the following have a standard heat of formation value of zero at 25oC and 1.0 atm except:
A) He(g)
B) H2O(s)
C) O2(g)
D) H2(g) E) N2(g)

A

B) H2O(s)

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11
Q

What are the “multidentate ligands” Write two examples for these ligands!

A

connect central atom ion with more bonds

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12
Q

What is the “catalyst” ? Show an example!

A

make activation energy lower
eg. h2o2 -> (MnO2) H2O + O2

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13
Q

Which compound is a solid in standard conditions?

A

I2, S,KMnO4, SO3, Na

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14
Q

Which compound is a gas in standard conditions?

A

H2, Ar, NH3, HCl,O3,NO2

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15
Q

Which compound is a liquid in standard conditions?

A

HNO3, H202, Hg, Br2

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16
Q

Which one of the following substances does only exist?
a. CH6
B. NaSO4
C.KI2
D. CO3
E.Al2O2

A

e

17
Q

Which one of the following substances does only exist?
a. NaCl3
b. AL2O2
C.NH2
D.CACO3
E.K2CL

A

B

18
Q

Which one of the following substances does only exist?
A. NACL2
B.LI2O
C.NH2
D.CA2CO3
E.MGCL

A

B

19
Q

Which one of the following substances does only exist?
A. NACL2
B. AL202
C.N2H2
D.CACO3
E.KCL

A

KCL

20
Q

Which one of the following substances does only exist?
A.BABR3
B.LICL
C.HE2O
D.NK4
E.KCL2

A

B

21
Q

Which one of the following substances does only exist?
A.CH4
B.CA2SO4
C.SIO3
D.LIO4
E.NH4

A

A

22
Q

Which compound has a strong odour (smell)?
A) KMnO4
B) Br2
C) NaF
D) H2
E) C (diamond

A

Br2

23
Q

Which compound has a strong odour (smell)?
A) KMnO4
B) NH3
C) NaF
D) H2
E) C (diamond)

A

NH3

24
Q

Which one of the next materials is soluble in water? A) potassium chloride.
B) barium sulfate
C) lead sulfate.
D) iodine.
E) silver chloride.

A

a

25
Q

Which one of the next materials is NOT soluble in water?
A) sodium chloride.
B) ammonia.
C) potassium permanganate.
D) iodine.
E) hydrogen chloride.

A

d

26
Q

Which of the following statements about the diamond is NOT correct ? It…
A)is nonpolar.
B) contains only carbon atoms.
C)is built up by covalent bonds.
D) is soluble in nonpolar solvents.
E)is combustible.

A

D

27
Q

Which of the following statements about the sulfur’s molecule is NOT correct ? It…
A) is nonpolar.
B) contains 8 sulfur atom.
C) built up by covalent bonds.
D) ’s shape is a ring.
E) contains delocalized electrons.

A

E

28
Q

Which
compound gives photochemical smog with brownish color?
A) NO
B) SO2
C) NO2
D)CO2
E) SO3

A

C

29
Q

Which of the following statements about the oxigen is CORRECT ? It…
A) is polar.
B) is 78% of the air.
C) is an oxidizing agent.
D) has a characteristic odor.
E) is a liquid under 0oC.

A

C

30
Q

goals of chromatogrphy

A

separation
identification
quantitative analysis

CHEM 1 (4 decks)

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