Did Dumbledore tell Snape about the horcruxes?

We don’t even know if Snape knew what a horcrux was. He understood Dumbledore when he explained that a part of Voldemort’s soul broke off and attached itself to Harry, but that doesn’t mean that he knows that dark wizards sometimes do something similar on purpose. Snape does have some kind of affinity to the dark arts.

Did Dumbledore know about the Chamber of Secrets?

Dumbledore couldn’t figure out about the Chamber of Secrets because simply put, he wasn’t an heir of Slytherin. It was said that only a true heir of Slytherin could do that. We know that Ron proved that wrong when he opened the Chamber to retrieve the basilisk fangs.

Why didn’t Harry summon Dumbledore with the resurrection stone?

Why didn’t Harry see Dumbledore among those he could see using the Stone? He didn’t want to. Harry never got a chance to say good bye to his parents, or their best friends. His parents died when he was a baby, and I doubt he would’ve gone to their funeral.

Why didn’t voldy create a Horcrux for Snape?

Snape in fact was defined by the power of love, something which Voldy never comprehended. Thus, the lack of the two utmost required things to create a Horcrux in the moment when Snape shot the killing curse at Dumbledore, explains why there was no possibility of creating one.

Why did Snape hate Dumbledore so much?

The hatred on Snape’s face when Dumbledore was pleading in the midst of the Death Eaters on top of the Astronomy tower was in regard to siding with his plan of killing him for another purpose (as is explained in book 7).

Why didn’t Snape tell Bellatrix the location of Voldemort’s secret?

Also, don’t overlook the fact that Snape might have told the secret only to Voldemort himself. Voldemort wouldn’t have told Bellatrix or others about the location or have Snape reveal it to them, because there’s no point of doing that; he was not the kind of chip chatting guy nor was any reason for them to know it.

Would Snape have been known to Voldemort and the Death Eaters?

Just as sure as Lily is dead, Snape would not have brought Harry to harm by revealing Grimmauld place to Voldemort and the Death Eaters. That Snape was a member of the OoP, might have been known to Voldemort and the Death Eaters. But the fact that Dumbledore was the secret keeper, may not have been known to anyone.