Chemistry
Chemistry, 13.12.2019 08:31, angelalovelis

Water evaporates from a puddle on the sidewalk on a hot summer day. is this a physical or chemical change? in this change is water absorbing energy from the surroundings, or releasing energy to the surroundings?

answer
Answers: 1

Other questions on the subject: Chemistry

image
Chemistry, 22.06.2019 00:30, xoxokaydavis5837
You have 125g of a certain seasoning and are told that it contains 76.0 g of salt what is the percentage of salt by mass in this seasoning
Answers: 1
image
Chemistry, 22.06.2019 03:00, HHHHHHHHHMMMMMMMMM
About 70 percent of the earth's surface is water-covered, and about 96.5 percent of all earth's water is salt water. identify the watery feature on earth that is made of freshwater rather than salt water. a) bay b) glacier c) ocean d) sea it is not incomplete this is the true question
Answers: 1
image
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.)
Answers: 3
image
Chemistry, 22.06.2019 10:00, Ivonne728
Drug abuse will not lead to physical and psychological dependence. true or false ?
Answers: 2
Do you know the correct answer?
Water evaporates from a puddle on the sidewalk on a hot summer day. is this a physical or chemical c...

Questions in other subjects:

Konu
Mathematics, 10.04.2020 06:37