Chemistry, 19.07.2020 01:01 portielesc

What are Methods scientists use to determine if a change was physical or chemical?

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Chemistry, 22.06.2019 03:40, allyyzz

Astudent is given a sample of a blue copper sulfate hydrate. he weighs the sample in a dry covered porcelain crucible and got a mass of 23.875 g for the crucible, lid, and sample. the mass of the empty crucible and lid was found earlier to be 22.652 g. he then heats the crucible to expel the water of hydration, keeping the crucible at red heat for 10 minutes with the lid slightly ajar. on colling, he finds the mass of crucible, lid, and contents to be 23.403 g. the sample was changed in the process to very light clue anhydrous cuso4. if there are again 100.0 g of hydrate, how many grams of cuso4 are in it? how many moles of cuso4? (hint: molar mass of cuso4 = 159.6 g / mole. what per cent of the hydrate is cuso4? you may convert the mass of cuso4 to moles.)

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Chemistry, 22.06.2019 14:00, emilyproce

In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2

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Chemistry, 22.06.2019 15:00, MilanPatel

How is the shape of the poem “peer” connected to its meaning?

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Chemistry, 22.06.2019 20:30, camerondillonn

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.