To write the balanced chemical equation of the reaction of formation of calcium hydride from calcium and H 2 Concept introduction: The reaction of elements with hydrogen produces either ionic metal hydrides or molecular compounds. The reaction of hydrogen with metals produces ionic metal hydrides. The electronegativity of hydrogen is more than metals and hence, metals bear positive charge and hydrogen has a negative charge. Thus, the oxidation number of hydrogen in ionic metal hydrides is − 1 . The reaction of calcium and hydrogen forms calcium hydride. The reaction occurs at 300 − 400 degrees temperature. Calcium hydride is very reactive compound and reacts violently with water to produce hydrogen gas and calcium hydroxide. Thus, it is used as a drying agent for organic solvents. The hydrogen and calcium hydroxide is separated by the process of filtration or distillation.

Question

2. Calculate the branching ratio of the reaction of the methyl peroxy radical with either HO, NO 298K) (note: rate constant can be found in the tropospheric chemistry ppt CH,O,+NO-HCHO+HO, + NO, CH₂O+HO, CH₂00H +0₂ when the concentration of hydroperoxyl radical is DH01-1.5 x 10 molecules and the nitrogen oxide maxing ratio of 10 ppb when the concentration of hydroperoxyl radicalis [H0] +1.5x10 molecules cm" and the nitrogen oxide mixing ratio of 30 p Under which condition do you expect more formaldehyde to be produced and why

Answer 1

Question

Chapter 21, Problem 36PS

(a)

Interpretation Introduction

Interpretation: To write the balanced chemical equation of the reaction of formation of calcium hydride from calcium and H2

Concept introduction: The reaction of elements with hydrogen produces either ionic metal hydrides or molecular compounds. The reaction of hydrogen with metals produces ionic metal hydrides. The electronegativity of hydrogen is more than metals and hence, metals bear positive charge and hydrogen has a negative charge. Thus, the oxidation number of hydrogen in ionic metal hydrides is −1.

The reaction of calcium and hydrogen forms calcium hydride. The reaction occurs at 300−400 degrees temperature. Calcium hydride is very reactive compound and reacts violently with water to produce hydrogen gas and calcium hydroxide. Thus, it is used as a drying agent for organic solvents. The hydrogen and calcium hydroxide is separated by the process of filtration or distillation.

(b)

Interpretation Introduction

Interpretation: To write the balanced chemical equation of the reaction of calcium hydride with water.

Concept introduction: The reaction of elements with hydrogen produces either ionic metal hydrides or molecular compounds. The reaction of hydrogen with metals produces ionic metal hydrides. The electronegativity of hydrogen is more than metals and hence, metals bear positive charge and hydrogen has a negative charge. Thus, the oxidation number of hydrogen in ionic metal hydrides is −1.

The reaction of calcium and hydrogen forms calcium hydride. The reaction occurs at 300−400 degrees temperature. Calcium hydride is very reactive compound and reacts violently with water to produce hydrogen gas and calcium hydroxide. Thus, it is used as a drying agent for organic solvents. The hydrogen and calcium hydroxide is separated by the process of filtration or distillation.

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