Come on all the people , not for bàd purpóse just for chàt and making new friends

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What are the spectator ions in 2h+ + so42- + ca2+ + 2r → caso4 + 2h+ + 21?

How much heat is added if 0.814g of water increase in temperature by 0.351 degree c?

How does the atmosphere to make earth livable? check all that apply. causes the seasons contains oxygen provides warmth creates important nutrients blocks harmful energy from the sun plz like !