Fossils are often the hard parts of once-living things. But an organism’s soft parts can also be preserved. Which materials can preserve soft parts? Select all the answers that apply. A. ice B. amber C. sand D. rock

What are the percent by mass of copper in penny lab

Assuming complete dissociation of the solute, how many grams of kno3 must be added to 275 ml of water to produce a solution that freezes at -14.5 c? the freezing point for pure water is 0.0 c and k_f is equal to 1.86 c/m

If you burn 46.6 g of hydrogen and produce 416 g of water, how much oxygen reacted