In order for a substance to move from gas to liquid, what has to occur?
Question 4 optio...
In order for a substance to move from gas to liquid, what has to occur?
Question 4 options:
The substance must undergo an endothermic reaction and absorb energy
The substance must undergo an exothermic reaction and absorb energy
The substance must undergo an endothermic reaction and release energy
The substance must undergo an exothermic reaction and release energy
Answers: 3
Chemistry, 21.06.2019 15:00
Which of the following elements is a representative element? a. chromium (cr) b. aluminum (al) c. mercury (hg) d. silver (ag)
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Which term refers to a property that depends only on the amount of a substance? ©@
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Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?
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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
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