Aslice of pizza has 500 kcal. if we could burn the pizza and use all the heat to warm a 50-l container of cold water, what would be the approximate increase in the temperature of the water? ( note: a liter of cold water weighs about 1 kg.)

Plz choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. is it possible for two different compounds to be made from the exact same two elements? why or why not? with a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?

Why is permeable soil best for plants that need a lot of drainage?

Ascientist measures the speed of sound in a monatomic gas to be 449 m/s at 20∘c. what is the molar mass of this gas?