Chemistry Around Us questions
43 fact-checked questions — tap any to predict the answer, then read why.
- Why can pyrite-rich ground exposed by thaw keep generating acid after the first flush of water has passed?
- Why can IFRA restrict a natural essential oil ingredient, not just synthetics?
- Some long-wear perfumes keep citrus noticeable for hours. What breaks the old pyramid?
- Why can one perfume smell different on warm skin than on a paper strip?
- A fixative can make perfume last without being the loudest smell. What is it doing?
- Why does spraying perfume on a warm wrist smell stronger at first but fade faster?
- Why do citrus openings fade before woody notes in many perfumes?
- Why does an alcohol-based perfume often bloom loudly right after spraying?
- Why do a perfume's top notes arrive first and fade before its deeper notes?
- Why does old, opened beer taste flat and stale?
- Why do some beers smell skunky?
- Why do apples turn brown when cut?
- Why does baking soda fizz with vinegar?
- Why does milk form curds as it turns sour?
- How does yeast make wheat dough rise before it goes into the oven?
- What causes silver jewelry to turn black over time?
- Why does hydrogen peroxide bubble?
- What causes iron to rust?
- How does soap help water wash away grease?
- Why can your nose tell coffee apart from oranges?
- Why does dry ice produce a cloud that looks like smoke?
- Why does oil float on water?
- Why does alcohol evaporate quickly?
- How does chlorine bleach make a colored stain fade?
- Why do fireworks have different colors?
- Why do baking soda and vinegar bubble when mixed?
- Why do blown bubbles last longer with soapy water than with plain water?
- Why does water boil at 100°C at sea level?
- Why do onions make us cry?
- Why does copper turn green?
- Why does soap clean dishes?
- Why do batteries produce electricity?
- Why does a small soap bubble floating in still air become nearly spherical?
- Why can bread keep expanding in the oven after the yeast stops working?
- Why does rust form on iron?
- Why do fizzy drinks bubble?
- Why does salt melt ice?
- Why does milk turn sour?
- Why does baking powder make cakes rise?
- Why does sugar dissolve in water?
- Why does popcorn pop?
- Why does metal feel colder than wood?
- Why does fire need oxygen?