Chemistry - Study Mode

[#806] What is used in storage batteries?
Correct Answer

(C) Lead

Explanation

Solution: Lead is in the manufacture of storage batteries. It is used in ammunition (shot and bullets) and as a constituent of solder, type metal, bearing alloys, fusible alloys, and pewter.

[#807] Brass is made of
Correct Answer

(C) Copper and zinc

Explanation

Solution: Brass is a homogeneous mixture (solid solution) of copper and zinc.

[#808] Bridgmanite is
Correct Answer

(C) Earth’s most abundant mineral

Explanation

Solution: Bridgmanite is earth's most abundant mineral.

[#809] Bronze is an alloy of
Correct Answer

(C) Copper and Tin

Explanation

Solution: Bronze is an alloy traditionally composed of copper and tin.

[#810] Percentage of carbon in steel ranges from
Correct Answer

(A) 0.1 to 1.5

Explanation

Solution: Steel is an alloy made by combining iron and other elements, the most common of these being carbon. When carbon is used, its content in the steel is between 0.2% and 2.1% by weight, depending on the grade. Other alloying elements sometimes used are manganese, chromium, vanadium and tungsten. Carbon and other elements act as a hardening agent, preventing dislocations in the iron atom crystal lattice from sliding past one another. Varying the amount of alloying elements and the form of their presence in the steel (solute elements, precipitated phase) controls qualities such as the hardness, ductility, and tensile strength of the resulting steel. Steel with increased carbon content can be made harder and stronger than iron, but such steel is also less ductile than iron. Alloys with a higher than 2.1% carbon content are known as cast iron because of their lower melting point and good castability.