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Chemistry 102 > EXAM 2 STUDY GUIDE > Flashcards

EXAM 2 STUDY GUIDE Flashcards

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1
Q

Calcium reacts with water according to the chemical equation below:
Ca + 2H2O–> Ca(OH)2 + H2
All but which reaction is expected to occur on the basis of the reaction of calcium and water?

A

Al + 2H2O –> Al(OH)2 + H2

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2
Q

Jons Jacob Berzelius developed a theory of chemical bonding based on which of the following ideas.

A

The attraction of opposite charges

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3
Q

The property of valence, introduced by Edward Frankland in 1852, pertains to which chemical behavior.

A

The number of chemical bonds made by an element.

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4
Q

The valence of a transistion element that exhibits more than one primary valence is often designated in a particular compound by a roman numeral. Predict the formula for iron (III) chloride.

A

FeCl3

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5
Q

Deduce the empirical formula for vanadium (II) oxide.

A

VO

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6
Q

Predict the formula for the compound magnesium oxide.

A

MgO

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7
Q

Predict the formula for the compound magnesium perchlorate.

A

Mg(ClO4)2

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8
Q

Predict the formula for the compound sodium phosphate.

A

Na3PO4

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9
Q

Predict the formula for ammonium carbonate.

A

(NH4)2CO3

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10
Q

What are the horizontal rows on the periodic chart called?

A

periods

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11
Q

Calculate the molar volume of boron. The density of boron is 2.34 g/mL.

A

4.62 mL

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12
Q

Calculate the molar volume of gold; its density is 19.3 g/mL.

A

10.2 mL

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13
Q

What is the name of the compound GaP?

A

What is the name of the compound GaP?

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14
Q

For what reason might one guess that the compound (ClO4)2SO4 is never observed?

A

Sulfate and perchlorate both have negative oxidation states.

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15
Q

Deduce the oxidaton state of carbon in carbon dioxide.

A

+4

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16
Q

Deduce the oxidation state of iron in Ba2FeO4.

A

+4

17
Q

What is the oxidation state of a hydrogen atom bound to an iron atom.

A

-1

18
Q

Deduce the oxidation state of copper in K3CuF6. Although the oxidation states of the VIIa elements are not addressed explicitly in the rules, assume the most likely possibility.

A

+3

19
Q

Deduce the oxidation state of manganese in KMnO4.

A

+7

20
Q

What is the name of the compound AlCl3?

A

aluminum chloride

21
Q

What is the name of the compound LiCl.

A

Lithium chloride

22
Q

What is the name of the compound Mg3(PO4)2?

A

magnesium phosphate

23
Q

What is the name of the compound SO3?

A

sulfur trioxide

24
Q

Deduce the valence of aluminum in Al2O3.

A

3

25
Q

Deduce the valence of calcium in CaO.

A

2

26
Q

What are the vertical columns of the periodic chart called?

A

families

27
Q

Which family of elements in the periodic table stands out most distinctly on the molar volume-atomic mass graph?

A

Group IA

28
Q

As a group, the IA elements are the most chemically reactive of the periodic table. What conclusion follows most obviously from this fact and the molar volume curve?

A

large atoms are reactive

29
Q

Determine the volume of graphite (a form of carbon, density=2.19 g/mL) that contains 602 sextillion carbon atoms, i.e. the molar volume.

A

answer: 5.48 mL

solve: 602 sextillion carbon atoms is 6.02*10^23 carbon atoms or 1 mol carbon 
1 mol carbon has mass 12g 
If density = 2.19g/mL 
Equation: 
density = mass / volume 
rearrange 
volume = mass /density 
Volume = 12/2.19 
Volume = 5.48mL
30
Q

What is the molar volume of molybdenum (density 10.2 g/mL)?

A

9.39 ML

31
Q

In lecture, we used the idea of molar volume to illustrate what important feature of the elements.

A

That when ordered by increasing atomic mass, the size of the atoms varies periodically.

32
Q

A high molar volume is most obviously correlated with…

A

LOW density

33
Q

Zinc (density= 7.14 g/mL) is most commonly used to protect steel from corrosion in a process called hot dip galvanizing. What is the molar volume of this important element

A

9.16 ML

Chemistry 102 (2 decks)

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