In culinary terms, a broken emulsion refers to a mixture where two liquids that don't naturally blend together, such as oil and water, have separated after initially combining. This usually occurs in recipes like salad dressings, mayonnaise, and sauces where an emulsifier (like mustard or egg yolks) helps bind the ingredients temporarily. A broken emulsion can result from several factors: overheating, incorrect mixing techniques, or insufficient emulsifiers. It often appears as a curdled or separated mixture, impacting both texture and appearance. To fix this issue, adding more emulsifier or blending the mixture slowly at the right temperature can help recombine the liquids. Understanding how to prevent and repair broken emulsions is crucial for achieving consistent results in cooking and food preparation.

1,3-Butadiene, a compound with the formula C4H6, is an important industrial chemical primarily used as a monomer in the production of synthetic rubber. Upon reacting, it can undergo a variety of reactions due to its conjugated diene structure. One key reaction is polymerization, where 1,3-butadiene molecules link together to form larger molecules, like in the production of polybutadiene rubber. Additionally, 1,3-butadiene can participate in Diels-Alder reactions, a type of cycloaddition reaction, to form cyclohexene derivatives, useful in synthesizing a vast range of organic compounds including pharmaceuticals and pesticides. The presence of the conjugated diene system allows for these diverse reactivities, making 1,3-butadiene a versatile starting material in organic synthesis.

Printing 4 pages per sheet can indeed save ink, as it reduces the amount of whitespace typically printed around margins on a standard page. By compressing the content, less ink is used per page. However, this also depends on the nature of the content being printed. If the pages are densely packed with text or graphics, condensing them will still require a significant amount of ink for the smaller areas, albeit slightly less overall due to reduced margin spaces. Additionally, this approach is more ink-efficient for draft or review purposes where legibility is less critical than for a final output. It's worth noting that while ink savings are a benefit, the readability of the printed content might be compromised, especially for those with visual impairments. Thus, whether or not to use this method should be considered based on the importance of ink saving versus readability.