The contents of two petri dishes are described in the table. Contents of Petri Dishes
Petri Dish
Contents
Final State of the Substance
C Jelemental sulfur
fine yellow colored powder
D
compound sodium chloride white colored cubic crystals
Based on the final state, which statement is true about the substances in the petri dishes? (1 point)
a
The final substances in both petri dishes are mixtures.
The final substances in both petri dishes are pure substances.
The final substance in Petri dish C is a pure substance and in Petri dish D is a mixture.
The final substance in Petri dish C is a mixture and in Petri dish D is a pure substance.

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.)

According to the valence shell electron pair repulsion (vsepr) theory, a molecule that has four electron groups around the central atom will exhibit what electron geometry? view available hint(s) according to the valence shell electron pair repulsion (vsepr) theory, a molecule that has four electron groups around the central atom will exhibit what electron geometry? trigonal bipyramidal tetrahedral square planar determination of electron geometry requires information on whether the electron groups are lone pairs or bonding groups.

Ab c or d ? i’m not sure what the answer is