Select all that are true for plate boundaries A) During subduction, younger crust will sink under the older crust
B) Trenches are formed at convergent boundaries
C) Sea-Floor Spreading is the creation of new crust
D) The asthenosphere is the layer of moving plates
E) Transform plates will cause earthquakes
F) Sea-floor spreading happens at convergent boundaries
G) Heating from the sun causes the mantle to move which in return moves the plates
H) Volcanoes are created by hotspots​

What type of reaction is zn + cucl2 → cu + zncl2?

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.)

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?