FiltersDone

Question type

Essay

Multiple Choice

Short Answer

True False

Matching

Exam 21: Metals and Solid-State Materials

Show Answer

Share

---

All types

Filters

Study FlashcardsPractice ExamLearn

Question 41

Multiple Choice

Review LaterAdd Note

Review Later

What is not an appropriate method of isolating the metals shown?

A) HgS(s) + O₂(g) + heat → Hg(g) + SO₂(g)
B) ZnO(s) + C(s) + heat → Zn(g) + CO(g)
C) WO₃(s) + 3 H₂(g) + heat → W(s) + 3 H₂O(g)
D) Al₂O₃(s) + 2 Cr(s) + heat → Cr₂O₃(s) + 2 Al(l)

Correct Answer

verified

Show Answer

Question 42

Multiple Choice

Review LaterAdd Note

Review Later

The following pictures show the electron populations of the composite s - d bands for Y,Mo,Ag,and Cd. -Which picture corresponds to Ag?

A) picture (1)
B) picture (2)
C) picture (3)
D) picture (4)

Correct Answer

verified

Show Answer

Question 43

Multiple Choice

Review LaterAdd Note

Use the picture below to answer the following questions. -What diagram would describe the molecular orbital picture for the species Na₄?

What minerals are important commercial sources of metals?

What type of substances exhibit an increase in conductivity with an increase in temperature?

Electrical resistance of a metal ________ with increasing temperature.

In order for a photovoltaic cell to convert light to electricity,the band gap must be less than or equal to the energy of the light absorbed.If light of 955 nm is to be absorbed,the band gap of the photovoltaic cell must be less than or equal to ________ kJ/mol.

The following pictures show the electron populations of the composite s-d bands for four different transition metals. -Which metal has the highest melting point?

What is a principal commercial ore for the element aluminum?

Al₂O₃ can be separated from iron oxide impurities in bauxite by dissolving the Al₂O₃ in hot aqueous NaOH.Give the formula of the aluminum complex ion that forms,and write a balanced net ionic equation for its formation by the reaction between Al₂O₃ and NaOH.

Which element is likely to be a principal impurity in zinc ore?

Which one of the following is a metallic conductor at room temperature but a superconductor at 18 K?

What is not generally considered to be a ceramic?

What metal is isolated from the ore rutile and what is the chemical formula of rutile?

What is a cermet?

What terminology best describes the bonding in the following schematic of a metal?

What metal is isolated from the ore sphalerite?

How does one commercially reduce the metal oxides or chlorides of sodium and magnesium?

What is the chemical process most likely to be used to purify zirconium metal?

Look at the location of elements A,B,C,and D in the following periodic table. -Which of these elements is likely to be found in nature as a carbonate?