149 questions and answers in this section

Natural Sciences » Chemistry

Explain why does water have its highest density at 4°C?

Explain why does water have its highest density at 4°C?

The water molecule has a bent shape: two hydrogen atoms bonded to a central oxygen atom, somewhat like Mickey's ears. Oxygen attracts electrons more strongly...

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Explain why do candles turn black?

Explain why do candles turn black?

A typical candle consists mainly of wax, usually paraffin, derived from petroleum products. This paraffin is made up of a mixture of hydrocarbons, which are...

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Explain why do pools use chlorine?

Explain why do pools use chlorine?

Chlorine is the number one disinfectant for pools, as it effectively kills the bacteria, viruses, and fungi that love to splash around in the water. Without it,...

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Explain why do bedsheets turn yellow?

Explain why do bedsheets turn yellow?

Every night, we naturally sweat to maintain our body temperature, even without realizing it. This sweat gradually seeps into the fibers of the sheets, leading...

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Explain why are CFCs and HFCs dangerous?

Explain why are CFCs and HFCs dangerous?

CFCs (chlorofluorocarbons) and certain HFCs (hydrofluorocarbons) release chemical components containing chlorine or fluorine into the atmosphere. Up there, in our atmosphere, these molecules interact with...

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Explain why wine bottles are 75 cl?

Explain why wine bottles are 75 cl?

This somewhat strange format of 75 cl dates back to the 19th century, a time when the English bought a large portion of French wines. The British...

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Explain why do the beaten egg whites not rise?

Explain why do the beaten egg whites not rise?

Even a tiny trace of egg yolk, butter, or oil can completely sabotage your whipped egg whites. Why? Because fats prevent the egg whites from...

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Explain why are jewelry items not made of 24 carats?

Explain why are jewelry items not made of 24 carats?

Carats indicate the amount of pure gold present in a piece of jewelry. It is a unit of measurement of the purity of gold, where...

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Explain why do silver jewelry tarnish?

Explain why do silver jewelry tarnish?

When your silver jewelry tarnishes, it is actually a simple little chemical reaction that occurs on the surface. Silver reacts easily with the sulfur naturally...

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Explain why do coins have reeded edges?

Explain why do coins have reeded edges?

In the past, coins were made of precious metals like gold or silver, and some clever individuals would discreetly scratch their edges to recover precious...

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