NEBOSH Practice Test

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What risk can arise from mixing water with certain hydrocarbons?

Stable Reaction
Increased Hydrocarbon Efficiency
Unstable Reaction
Reduced Emissions

The correct answer is: Unstable Reaction

Mixing water with certain hydrocarbons can lead to an unstable reaction due to the nature of their chemical properties. Hydrocarbons are organic compounds primarily made up of hydrogen and carbon atoms and are found in various forms, such as oils and fuels. When water is introduced to certain hydrocarbons, especially those that are non-polar, it can create a chaotic mixture that causes phase separation or agitation. This instability is primarily due to the fact that hydrocarbons do not mix with water (as they are hydrophobic), leading to potential issues like emulsification or the release of gases if there's any reaction involved. In some cases, contact between hydrocarbons and water can also lead to hazardous reactions, particularly if they contain volatile components. Such reactions can increase the risk of fire or explosions, particularly if there is a source of ignition present. Understanding this risk is crucial for maintaining safety in environments where hydrocarbons are handled, such as in industrial settings, laboratories, or during transportation.