Acetylene gas is used in Calcium Analysis experiment as a fuel source in Flame Atomic Absorption Spectrophotometry. Here are its two Globally Harmonized System (GHS) label hazards:

What do these labels indicate about acetylene?

Question

Acetylene gas is used in Calcium Analysis experiment as a fuel source in Flame Atomic Absorption Spectrophotometry. Here are its two Globally Harmonized System (GHS) label hazards:

What do these labels indicate about acetylene?

BlackTom AI · Accepted Answer

Let’s unpack what the question is asking about: interpreting GHS label hazards for acetylene used as a fuel in flame atomic absorption spectrophotometry.
Option 1: 'Acetylene is gas under pressure that is self-reactive.' This is inaccurate for acetylene. Acetylene gas is indeed supplied under pressure, but 'self-reactive' is a separate hazard class that refers to substances capable of such spontaneous reactivity under certain conditions, not a primary hazard typically associated with acetylene labels.
Option 2: 'Acetylene is extremely flammable gas under pressure.' This aligns with the GHS/UN classification for acetylene: a highly flammable gas (under pressure in cylinders) that forms a highly flammable mixture with air and can ignite easily. The combination of flammability and compressed state is exactly what the label imagery (flame over bar, and cylinder symbol) communicates.
Option 3: 'Acetylene is an oxidizing gas, under pressure.' This is incorrect. Acetylene is not categorized as an oxidizer; oxidizers promote combustion, whereas acetylene itself is a fuel. The oxidizer hazard would be associated with gases like oxygen or nitrous oxide in other contexts, not acetylene.
Option 4: 'Acetylene is flammable.' While technically true, this statement is incomplete. GHS labels for acetylene explicitly emphasize that it is a flammable gas under pressure, which conveys the added risk from high-pressure containers and the strong ignition potential—information missing in a broader 'flammable' claim alone.
In summary, the second option uniquely captures the combined hazards of high flammability and pressurized gas, which is the critical detail conveyed by GHS pictograms for acetylene. The other choices either misclassify the substance's hazard type (self-reactive, oxidizing) or omit the pressure-related nuance that influences handling and storage procedures.

CHEM100A_SP25_LST CHEM 100A: LAB SAFETY EXAM - Spring 2025

Acetylene gas is used in Calcium Analysis experiment as a fuel source in Flame Atomic Absorption Spectrophotometry. Here are its two Globally Harmonized System (GHS) label hazards: What do these labels indicate about acetylene?

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