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What is the correct chemical formula of a compound composed of calcium ions and sulfate ions? 

Calculate the percentage by mass (in %) of hydrogen in cisplatin, PtCl2(NH3)2.

What, if any, precipitate would form when solutions of KOH (aq) and Ba(NO3)2 (aq) are mixed together? Hint:  Consult the solubiltiy rules to determine the correct answer.

A sample of pure copper contains 2.89 x 1023 atoms of copper. What is the mass (in g) of this sample of copper?

A sample of pure silver contains 2.89 x 1023 atoms of silver. What is the mass (in g) of this sample of silver?

Which of the following is best classified as a acid-base neutralization reaction?

Which of the following compounds does NOT contain any ionic bonds? Hint: Ionic bonds are found in ionic compounds and covalent bonds are found in molecular compound and within polyatomic ions. 

Simplify. Write the answer with positive exponents.-(7)0 + (-5)0

Solve.x = for y

Write the solution set using interval notation. < - 6