The mass of a hydrated salt is initially 10.0 g. After heating, the mass of the salt is 7.35 g. How many waters are hydrated in the salt?

Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?

Amixture with the same composition throughout is!

What causes different colors to appear in the sky? the absorption of light by air molecules the reflection of light by bodies of water the greenhouse effect in earth's atmosphere the scattering and reflection of light by dust particles