Question 1

Which is not a property of ceramics?

Accepted Answer

Ceramics are generally known for their insulating properties, meaning they do not conduct electricity well.

Question 2

Which term or phrase does not apply to steel?

Accepted Answer

Steel typically has a low to medium carbon content and high carbon steel is not commonly used due to its brittleness.

Question 3

The most abundant substances in rocks are

Accepted Answer

Silicates are the most abundant substances in rocks, making up over 90% of the Earth's crust. Carbonates and sulfates are also common in rocks, but in much smaller quantities. Oxides are present in some rocks, but again, not as abundant as silicates.

Question 4

Which of the following metals is recovered from sea water?

Accepted Answer

Magnesium is the only metal that is recovered from sea water in large quantities through the process of evaporation and electrolysis. Iron and copper are typically mined from ore deposits on land.

Question 5

Which form of iron contains the least amount of carbon?

Accepted Answer

Steel contains the least amount of carbon compared to pig iron and cast iron. Pig iron and cast iron have higher carbon content, making them more brittle.

Question 6

The chloralkali process uses electrolysis of aqueous sodium chloride to produce all but one of the following.

Accepted Answer

CO₂ is not produced in the chloralkali process.

Question 7

Pyrex and Kimax glass typically contain an oxide of this element which gives the glass a small coefficient of thermal expansion.

Accepted Answer

Pyrex and Kimax glass contain boron oxide, which helps to reduce the thermal expansion of the glass, making it more resistant to thermal shock.

Question 8

Older glass Coke bottles were green due to the presence of this metal ion in the silica from which the bottle was made.

Accepted Answer

The green color in older glass Coke bottles was primarily due to the presence of iron ions (Fe²⁺) in the silica used to make the glass.

Question 9

The process by which aluminum is prepared from its ores is

Accepted Answer

Aluminum is extracted from its ore, bauxite, through the process of electrolysis, specifically using the Hall-Héroult process.

Question 10

Which element is likely to occur free in nature?

Accepted Answer

Silver is less reactive than the other elements listed and can be found in its native form in nature.

Question 11

Which of the following is the most abundant metal in the earth's crust?

Accepted Answer

The answer of Which of the following is the most...

Question 12

Which does not apply to silicates?

Accepted Answer

Silicates do not contain carbon; they are primarily composed of silicon and oxygen.

Question 13

Which metal is sufficiently concentrated in the oceans so that it is currently extracted commercially?

Accepted Answer

Magnesium is the metal that is currently extracted commercially from the oceans. Its concentration in seawater is higher compared to other metals like copper, iron, and aluminum.

Question 14

The most abundant element in the earth's crust is

Accepted Answer

Oxygen is the most abundant element in the Earth's crust, making up about 46.6% by weight.

Question 15

Which kind of rocks are formed by solidification of molten rock?

Accepted Answer

Igneous rocks are formed by the solidification of molten rock, either on the Earth's surface (extrusive) or within the Earth's crust (intrusive).

Question 16

Which mineral is likely to be used in cement and wallboard?

Accepted Answer

Sulfates, specifically gypsum (calcium sulfate), are commonly used in the production of cement and wallboard.

Question 17

Which of the following metals and ores is not a correct pair?

Accepted Answer

Gold does not typically form an oxide ore, so AuO is not a correct pair. Gold is usually found as free metallic grains in rocks and rivers.

Question 18

Which substance is formed when silica is melted (so that SiO₄ units are reorganized) and then cooled?

Accepted Answer

When silica is melted and then cooled, it forms an amorphous solid known as glass, not any of the other options listed (clay, talc, or feldspar).

Question 19

The main source of magnesium is

Accepted Answer

The answer of The main source of magnesium is
...

Question 20

What structural unit is characteristic of quartz and most silicates?

Accepted Answer

The structural unit that is characteristic of quartz and most silicates is the tetrahedral unit. This unit consists of four oxygen atoms surrounding a central silicon or aluminum atom.

Quiz 18: The Chemistry of Useful Materials