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[ Chemistry ] Open Question : Chemistry questions? Are they correct?

For questions 1-4, match the reaction type with the reaction.
A. Combination B. Combustion C. Decomposition
D. Neutralization E. Precipitation F. Single-displacement

1. Ba(OH)2 + H2SO4 -? 2 H2O + BaSO4 (F)
2. Cl2 + 2 NaI -> 2NaCl + I2 (E)
3. P4 + 10 Cl2 -> 4 PCl5 << H2 + O2 (C) <<< (A)

5. Select the correct statement below that fits a theoretical yield when a reaction between
equal masses of Ca and O occurs to produce CaO.

A. The mass of CaO produced equals the sum of the starting masses of Ca and O <<<< My answer
B. The mass of CaO produced is more than the sum of the masses of Ca and O
C. The mass of CaO produced is less than the sum of the masses of Ca and O
D. There is not enough information to complete this question
E. None of the answer choices are correct

Select the correct set of coefficients for the balanced chemical reaction using smallest
whole number coefficients.

RbOH(aq) + Al2(SO4)3(aq)  Rb2SO4(aq) + Al(OH)3(s)
A. 1, 1, 1, 1
B. 3, 1, 2, 2
C. 3, 1, 3, 1
D. 6, 1, 3, 2
E. 12, 1, 12, 6 < my answer

9. When C4H8O4, tetrose, dissolves in water

A. each C4+, H+, and O2- ion is surrounded by water
B. each CH and OH- particles are surrounded by water
C. each CH and OH particles are surrounded by water
D. each C4H8O4 molecule is surrounded by water
E. tetrose does not dissolve in water <<< my answer

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