Introduction Have you ever noticed how some chemical reactions release heat, while others absorb it? For example, when quicklime (calcium oxide) is mixed with water, the mixture becomes hot. On
Introduction Why does ice melt in your hand? Why does hot tea steam up your glasses? And how does the smell of perfume spread across a room within seconds? All
Introduction Have you ever charged your phone and wondered how that battery actually works? Or how electricity is used to extract shiny metals from dull rocks? It all comes down
Introduction Have you ever wondered what holds atoms together in water, salt, or the air we breathe? Atoms don’t like to stay alone. They bond with other atoms to form