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The mold on that petri dish wasnt supposed to be there Alexander Fleming knew contamination when he saw it a fuzzy greenish intruder ruining his carefully cultured Staphylococcus colonies He almost threw the plate away He didn t And that hesitation changed medicine forever What Is Penicillin Penicil
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You ve probably heard this question in a middle school science class seen it on a trivia night or maybe you ve just wondered it yourself while staring at an ice cube melting in your drink Is freezing water a chemical change Short answer no But the why matters more than the answer itself Most people
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Is a bathroom saltwater or freshwater Picture this you re standing in front of the mirror toothbrush in hand and you start wondering does the water that runs through your pipes count as saltwater or freshwater It s the kind of question that seems simple but somehow trips people up Maybe it came up d
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What Does a Forensic Chemist Do Forensic chemists are the unsung heroes of the justice system While crime shows often dramatize the role of detectives and crime scene investigators the real work behind solving cases often hinges on the meticulous analysis performed by these scientists Forensic chemi
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You drop a spoonful of sugar into hot coffee Stir Gone The liquid looks the same maybe a shade darker but the crystals are nowhere to be found Ask a roomful of people whether thats a physical or chemical change and you ll get a split vote Some swear its physical because you can get the sugar back Ot
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The Mystery of the Inert Elements Imagine a world where every element you studied eventually reacted with something burning dissolving forming compounds This was the assumption for most of chemistry s history Then came the noble gases Their discovery didn t just add new names to the periodic table i
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What Are 2 Examples of Liquid Dissolved in Liquid You probably made a liquid in liquid solution this morning without thinking twice That cup of coffee with a splash of milk Thats one A splash of vinegar in your salad dressing Thats another Dissolving a liquid in a liquid sounds like it should be com
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Have you ever stood in your kitchen watching a spoonful of white crystals vanish into a glass of water and wondered if they actually disappeared It looks like magic One moment you have solid grains and the next you have a clear sweet liquid But here is the thing that little kitchen experiment is act
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Why Does Fire Sometimes Burn Blue Instead of Orange Most people picture fire as orange or yellow Campfires candles birthday candles that warm flickering orange is what we expect But every so often you see a flame thats unmistakably blue and it stops you mid thought Whats going on there Why does fire
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The Moment You Step on a Fire Ant Hill You dont always see them coming One minute you re barefoot in the yard the next you feel a sharp burning pinch on your ankle and then another and another Fire ants dont give you a single warning They swarm they latch on and they sting over and over before you e
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