   Chapter 21, Problem 108GQ

Chapter
Section
Textbook Problem

In 1774, C. Scheele obtained a gas by reacting pyrolusite (MnO2) with sulfuric acid. The gas, which had been obtained that same year by Joseph Priestley by a different method, was an element, A.(a) What is the element isolated by Scheele and Priestley?(b) Element A combines with almost all other elements. For example, with cesium it gives a compound in which the mass percent of A is 19.39%. The element combines with hydrogen to give a compound with a mass percent of element A of 94.12%. Determine the formulas of the cesium and hydrogen compounds.(c) The compounds of cesium and hydrogen with element A react with one another. Write a balanced equation for the reaction.

(a)

Interpretation Introduction

Interpretation: The element isolated by Scheele and Priestley is to be stated.

Concept introduction:

An element is the substance that cannot be brocken down into other substances. All substances found on perodic table are elements.

Explanation

The oxygen was first discovered by Scheele. He called the element fire air...

(b)

Interpretation Introduction

Interpretation: To determine the formulas of cesium and hydrogen with element A.

Concept introduction:

The empirical formula of a chemical compound is the simplest positive integer ratio of atoms present in a compound.

A molecular formula shows the total number of atoms in a molecule but not their structural arrangement.

A chemical equation consists of reactants and products. The two are separated by an arrow. Each substance of reactants and products are separated from other by a plus sign. The reactants lie on left-hand side while products lie on right-hand side of the reaction.

A balanced chemical equation occurs when the number of atoms in reactant side is equal to the number of atoms in the product side.

(c)

Interpretation Introduction

Interpretation:  The compound of cesium and hydrogen with element A react with one another. The balanced chemical equation for the reaction is to be stated.

Concept introduction:

A chemical equation consists of reactants and products. The two are separated by an arrow. Each substances of reactants and products are separated from other by a plus sign. The reactants lies on left hand side while products lies on right hand side of the reaction.

A balanced chemical equation occurs when the number of atoms in reactant side is equal to the number of atoms in the product side

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