Chapter 21 Practice Test Flashcards Preview

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Flashcards in Chapter 21 Practice Test Deck (25)
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1
Q

Which of the following is NOT a property of a metal?

A

Solid at standard temperature

2
Q

Which of the following is not a refining method?

A

Distilling

3
Q

Which of the following represents the reduction step in processing?

A

ZnO + C → Zn + CO

4
Q

Which of the following is not an alloy?

A

iron

5
Q

Which of the following is a property of a metal?

A

conduct electricity

6
Q

Which of the following shows the electron configuration for di-lithium in a gas state?

A

2s ____↑↓_____

7
Q

Which of the following electron configuration would be an electrical conductor?

A

[Cu] 4s13d10

8
Q

Which of the following electron diagrams shows lithium?

A

2s ____↑_____

9
Q

What type of solid is diamond?

A

Network

10
Q

Germanium is used in nuclear physics as a radiation detector. The energy gap in germanium is 0.72 eV. Suppose a 600-keV photon passes through a germanium crystal, gradually losing all of its energy by exciting electrons to the conduction band. About how many electrons will be moved to the conduction band?

A

8.3 × 10^5 electrons

11
Q

Which one of the following has the largest energy gap between the valence band and the conduction band?

A

An insulator

12
Q

What happens to the conductivity of a semiconductor as the temperature increases?

A

It increases.

13
Q

Which of the following results in a p-type semiconductor?

A

Si doped with Al

14
Q

Which of the following mixtures is least likely to have the characteristics of a semiconductor?

A

ZnO

15
Q

As the temperature of a metal is increased, the conductivity decreases because molecular orbitals are perturbed by the vibrational energy of the atoms. Which of the following describes what happens to the conductivity of semiconductors with increasing temperature?

A

The conductivity increases but then decreases at even higher temperatures

16
Q

Which of the following results in an n-type semiconductor?

A

Ge doped with As

17
Q

What is the most common oxidation state for alkali metals?

A

+1

18
Q

Which of the following elements is an alkali metal?

A

Lithium, Li

19
Q

Which two alkali metals are essential elements in living organisms?

A

Sodium and potassium

20
Q

What is the third most common element in seawater?

A

Magnesium

21
Q

Arrange the steps of the Dow process of magnesium isolation in the correct order:

  1. Mg(OH)2 + HCl -> MgCl2 + 2H2O
  2. Mg2+ + 2OH- -> Mg(OH)2
  3. CaO + H2O -> Ca(OH)2
  4. MgCl2(l) -> Mg(s) + Cl2(g)
A

3, 2, 1, 4

22
Q

Which of the following equations correctly describes the water softening process?

A

Ca2+(aq) + 2HCO3- (aq) + Ca2+(aq) + 2OH-(aq) -> 2CaCO3(s) + 2H2O(l)

23
Q

Which of the following aluminum ores contains aluminum and no other metals?

A

Corundum

24
Q

Arrange the steps of the Bayer process of alumina production (from bauxite) in the correct order:

  1. Al(OH)4- -> Al(OH)3 + OH-
  2. Al(OH)3 + OH- -> Al(OH)4-; Al(O)OH + OH- + H2O -> Al(OH)4-
  3. Al(OH)3 (heated) -> Al2O3 + H2O
  4. AlCl3 + 3K(Hg)x(l) -> 3KCl(s) + Al(Hg)x(l)
A

2, 1, 3

25
Q

All of the following compounds are amphoteric except:

A

CaO

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