【Daily Question】A question about acetylene; it’s quite difficult. +1 wealth for answering, +5 wealth for a correct answer
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This post was last edited by Reflecting on the Three Kingdoms liu on 2015-7-15 at 16:45. When acetylene is in prolonged contact with metals such as copper, silver, mercury, or their salts, explosive compounds such as copper acetylide (Cu2C2) and silver acetylide (Ag2C2) are formed; these compounds can explode when subjected to friction or impact. Therefore, all equipment intended for acetylene use must not be made of silver or copper alloys with a copper content of ( ) or higher. Therefore, the copper content in copper valves should not exceed ( ). The copper content of a copper valve material can be determined from its grade. The material for bottle valves should be carbon steel or low-alloy steel; if a copper alloy is used, its copper content shall not exceed ( ). In practice, the valve at the acetylene cylinder mouth is made of brass. A 70% B 60% C 65% D 75% E 80% There is only one correct answer
When acetylene is in prolonged contact with metals such as copper, silver, mercury, or their salts, explosive compounds such as copper acetylide (Cu2C2) and silver acetylide (Ag2C2) are formed; these can explode when subjected to friction or impact. Therefore, all equipment intended for acetylene use must not be made of silver or copper alloys with a copper content of (a) or higher. Therefore, the copper content in copper valves should not exceed (c). The copper content of a copper valve material can be determined from its grade. The material for bottle valves should be carbon steel or low-alloy steel; if a copper alloy is used, its copper content shall not exceed (b). In practice, the valve at the acetylene cylinder mouth is made of brass. A 70% B 60% C 65% D 75% E 80%
Option A should be chosen. When acetylene is in prolonged contact with metals such as copper, silver, mercury, or their salts, explosive compounds such as copper acetylide (Cu2C2) and silver acetylide (Ag2C2) are formed; these compounds can explode when subjected to friction or impact. Therefore, no equipment intended for acetylene use may be made of silver or copper alloys with a copper content of over 70%.
When acetylene is in prolonged contact with metals such as copper, silver, mercury, or their salts, explosive compounds such as copper acetylide (Cu2C2) and silver acetylide (Ag2C2) are formed; these can explode when subjected to friction or impact. Therefore, all equipment intended for acetylene use must not be made of silver or copper alloys with a copper content of (A) or higher. Therefore, the copper content in copper valves should not exceed (A). The copper content of a copper valve material can be determined from its grade. The material for bottle valves should be carbon steel or low-alloy steel; if a copper alloy is used, its copper content shall not exceed (A). In practice, the valve at the acetylene cylinder mouth is made of brass. A 70% B 60% C 65% D 75% E 80%