Exam 2: Atoms, molecules, and Ions

Treatment of sodium borohydride with sulfuric acid is a convenient method for the preparation of diborane: __ NaBH₄ + __ H₂SO₄ → __ B₂H₆ + __ H₂ + __Na₂SO₄ When the equation is balanced,the lowest whole number coefficient for hydrogen is

Naturally occurring element X exists in three isotopic forms: X-28 (27.979 amu,92.21% abundance),X-29 (28.976 amu,4.70% abundance),and X-30 (29.974 amu,3.09% abundance).Calculate the atomic weight of X.

The names of the elements whose symbols are Si,P,Mn,and S are,respectively,

In the following chemical equation,what is the reactant? CuSO₄·5H₂O(s)→ CuO(s)+ SO₃(g)+ 5H₂O(l)

What is the formula for sodium peroxide?

Which of the following atomic symbols represents an isotope of ⁹⁴Mo?

The species Ag⁺,Pt²⁺,and Tl³⁺ are all

The formula of water,H₂O,suggests

In a particular mass of KAu(CN)₂,there are 6.66 × 10²⁰ atoms of gold.What is the total number of atoms in this sample?

All the following may change during a chemical reaction except

Which of the following statements best describes the particulate representation depicted by the picture?

Which name-formula pair is incorrect?

The name of the SO₄^2- ion is

The symbol for tin is

Suppose atom 1 has the same number of protons as atom 2,and atom 2 has the same number of neutrons as atom 3.Atom 1 does not have the same number of neutrons as atom 3.Which of the following statements is true?

The correct name for FeO is

What is the symbol of the nuclide having 13 protons and 14 neutrons?

Cathode rays are

What is the balanced chemical equation that represents the following reaction?

What is the subscript of potassium in the formula for potassium carbonate?