Interpretation: The clues in the given photographs to indicate a chemical change needs to be explained.

Concept Introduction: When a substance changes its appearance or change in the state takes place and there is no change in its chemical composition, the change is said to be physical. On the other hand, when there is a change in the chemical composition of a substance or a new substance is formed after a chemical reaction, it is known as a chemical change.

Expert Solution & Answer

Explanation of Solution

When a coil of zinc metal is added to a solution of sulfuric acid, oxidation of zinc takes place by acid. Here, gas is released which indicates that a chemical reaction is taking place. In photograph A, it can be seen that the zinc coil starts to corrode and dissolve in sulphuric acid. The products formed are zinc sulfate and hydrogen gas. As a chemical reaction is taking place, it is a chemical change.

When a yellow solution of sodium chromate is added to a colorless solution of silver nitrate, a reddish-brown solid is formed. This can be seen in photograph B. Here, silver chromate and sodium nitrate are products formed in the reaction. This reddish-brown color shows the formation of silver chromate. The formation of reddish-brown solid shows the formation of a new substance. Thus, it is a chemical change.

Chapter 2, Problem 76A

Chapter 2, Problem 78A

Chapter 2 Solutions

EP CHEMISTRY-ETEXT ACCESS

Ch. 2.1 - Prob. 1LC Ch. 2.1 - Prob. 2LC Ch. 2.1 - Prob. 3LC Ch. 2.1 - Prob. 4LC Ch. 2.1 - Prob. 5LC Ch. 2.1 - Prob. 6LC Ch. 2.1 - Prob. 7LC Ch. 2.1 - Prob. 8LC Ch. 2.1 - Prob. 9LC Ch. 2.1 - Prob. 10SP

Ch. 2.1 - Prob. 11SP Ch. 2.2 - Prob. 12LC Ch. 2.2 - Prob. 13LC Ch. 2.2 - Prob. 14LC Ch. 2.2 - Prob. 15LC Ch. 2.2 - Prob. 16LC Ch. 2.2 - Prob. 17LC Ch. 2.2 - Prob. 18LC Ch. 2.2 - Prob. 19LC Ch. 2.3 - Prob. 20SP Ch. 2.3 - Prob. 21SP Ch. 2.3 - Prob. 22LC Ch. 2.3 - Prob. 23LC Ch. 2.3 - Prob. 24LC Ch. 2.3 - Prob. 25LC Ch. 2.3 - Prob. 26LC Ch. 2.3 - Prob. 27LC Ch. 2.3 - Prob. 28LC Ch. 2.3 - Prob. 29LC Ch. 2.3 - Prob. 30LC Ch. 2.3 - Prob. 31LC Ch. 2.4 - Prob. 32LC Ch. 2.4 - Prob. 33LC Ch. 2.4 - Prob. 34LC Ch. 2.4 - Prob. 35LC Ch. 2.4 - Prob. 36LC Ch. 2.4 - Prob. 37LC Ch. 2.4 - Prob. 38LC Ch. 2 - Prob. 39A Ch. 2 - Prob. 40A Ch. 2 - Prob. 41A Ch. 2 - Prob. 42A Ch. 2 - Prob. 43A Ch. 2 - Prob. 44A Ch. 2 - Prob. 45A Ch. 2 - Prob. 46A Ch. 2 - Prob. 47A Ch. 2 - Prob. 48A Ch. 2 - Prob. 49A Ch. 2 - Prob. 50A Ch. 2 - Prob. 51A Ch. 2 - Prob. 52A Ch. 2 - Prob. 53A Ch. 2 - Prob. 54A Ch. 2 - Prob. 55A Ch. 2 - Prob. 56A Ch. 2 - Prob. 57A Ch. 2 - Prob. 58A Ch. 2 - Prob. 59A Ch. 2 - Prob. 60A Ch. 2 - Prob. 61A Ch. 2 - Prob. 62A Ch. 2 - Prob. 63A Ch. 2 - Prob. 64A Ch. 2 - Prob. 65A Ch. 2 - Prob. 66A Ch. 2 - Prob. 67A Ch. 2 - Prob. 68A Ch. 2 - Prob. 69A Ch. 2 - Prob. 70A Ch. 2 - Prob. 71A Ch. 2 - Prob. 72A Ch. 2 - Prob. 73A Ch. 2 - Prob. 74A Ch. 2 - Prob. 75A Ch. 2 - Prob. 76A Ch. 2 - Prob. 77A Ch. 2 - Prob. 78A Ch. 2 - Prob. 79A Ch. 2 - Prob. 80A Ch. 2 - Prob. 81A Ch. 2 - Prob. 82A Ch. 2 - Prob. 83A Ch. 2 - Prob. 84A Ch. 2 - Prob. 85A Ch. 2 - Prob. 86A Ch. 2 - Prob. 87A Ch. 2 - Prob. 88A Ch. 2 - Prob. 89A Ch. 2 - Prob. 90A Ch. 2 - Prob. 93A Ch. 2 - Prob. 94A Ch. 2 - Prob. 95A Ch. 2 - Prob. 1STP Ch. 2 - Prob. 2STP Ch. 2 - Prob. 3STP Ch. 2 - Prob. 4STP Ch. 2 - Prob. 5STP Ch. 2 - Prob. 6STP Ch. 2 - Prob. 7STP Ch. 2 - Prob. 8STP Ch. 2 - Prob. 9STP Ch. 2 - Prob. 10STP Ch. 2 - Prob. 11STP Ch. 2 - Prob. 12STP Ch. 2 - Prob. 13STP Ch. 2 - Prob. 14STP

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