Metals

Q1: What is true about metals?

Conduct electricity well
Usually have low melting point temperature.
Can not conduct heat.
Can not be a molecular compound.
Are not malleable.
Good answeres: 1

Q2: Which of the chemical elements is NOT a metal?

Ag
Cu
Na
Br
Ga
Good answeres: 1

Q3: Approximately how many percent of the Earth's crust is composed by the metals?

62%
35%
25%
70%
10%
Good answeres: 1

Q4: The solid or liquid state of metals largely originates in the capacity of the metal atoms involved to readily "gain" their outer shell electrons.

True
False
Good answeres: 1

Q5: When reacting with oxygen, most of the metals will form:

Oxides
Benzene rings
Amines
Ketones
Good answeres: 1

Q6: Which metal does NOT react with oxygen at all?

Copper
Manganese
Iron
Zinc
Platinum
Good answeres: 1

Q7: What is an alloy?

Is a mixture composed of only two elements and one of them is a metal.
Is a substance having metallic properties composed of two or more elements and at least one of them is a metal.
Is a substance having metallic properties composed of at least three different metals.
Is a substance that has no metallic properties.
Good answeres: 1

Q8: The purpose/purposes of making alloys is generally to make the metals:

Less brittle
Softer
Harder
Resistant to corrosion
Change the color or luster
Good answeres: 4

Q9: The usual formulation of the alloy nickel silver is 60% copper, 20% nickel and 20% zinc

True
False
Good answeres: 1

Q10: What are the main characteristics of a heavy metal?

They are good for producing metal structures in civil engineering and tools such as hammer and pipes.
They are relatively dense and humans need high amount of intake.
They are relatively dense and notably toxic.
They usually are white-colored metals with relatively low melting points.
They are easily oxidized or corroded.
Good answeres: 1

Q11: Which statement is true?

Metals are primarily found as lithophiles (ore-loving) or chalcophiles (rock-loving)
Metals are primarily found as lithophiles (rock-loving) or chalcophiles (ore-loving).
Good answeres: 1

Q12: During the World War I, major governments demanded large shipments of ________ for light strong airframes.

Zinc
Iron
Copper
Nickel
Aluminium
Good answeres: 1

Q13: Shortly after the World War II, super alloys were developed for use in:

High performance engines, operating at temperatures above 500°C.
High performance engines, operating at temperatures above 650°C.
High performance engines, operating at temperatures above 450°C.
High performance engines, operating at temperatures above 550°C.
High performance engines, operating at temperatures above 600°C.
Good answeres: 1

Q14: 95% of the energy used to make aluminium from bauxite ore is saved by using recycled material.

True
False
Good answeres: 1

Q15: Regarding to heat conductivity of metal is correct to affirm that:

The contribution of a metal's electrons to its heat capacity and thermal conductivity, and the electrical conductivity of the metal itself can not be calculated.
The electrons in a metal's electron cloud are highly stable and hardly able to pass on heat-induced vibrational energy.
For metals at high temperatures the heat is carried mainly by the free electrons.
The electrons in a metal's electron cloud are highly mobile and easily able to pass on heat-induced vibrational energy.
The thermal conductivity tends to be inversely proportional to temperature.
Good answeres: 1