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Chapter 1: Problem 21

Label each of the following as either a physical process or a chemical process: (a) rusting of a metal can, (b) boiling a cup of water, (c) pulverizing an aspirin, (d) digesting a candy bar, (e) exploding of nitroglyerin.

Short Answer

Expert verified
(a) Rusting of a metal can: chemical process (b) Boiling a cup of water: physical process (c) Pulverizing an aspirin: physical process (d) Digesting a candy bar: chemical process (e) Exploding of nitroglycerin: chemical process

Step by step solution

01

(a) Classifying the rusting of a metal can

Rusting is a process in which a metal reacts with oxygen and moisture to form a new substance called rust (iron oxide). It is a chemical change because the chemical composition of the metal changes during rusting. So, the rusting of a metal can is a chemical process.
02

(b) Classifying the boiling of a cup of water

Boiling water involves the change of state from liquid to gas (vapor). There is no change in the chemical composition of water during boiling; H2O remains H2O in both liquid and vapor forms. So, boiling a cup of water is a physical process.
03

(c) Classifying the pulverizing of an aspirin

Pulverizing an aspirin involves breaking the aspirin into smaller pieces or powder, which is a change in its physical form. There is no change in the chemical composition of aspirin during pulverization. So, pulverizing an aspirin is a physical process.
04

(d) Classifying the digesting of a candy bar

Digesting a candy bar involves various chemical reactions occurring in the body to break down the candy bar into simpler substances like glucose and amino acids, which can be further utilized by the body. This process involves a change in the chemical composition of the candy bar constituents. So, digesting a candy bar is a chemical process.
05

(e) Classifying the exploding of nitroglycerin

The exploding of nitroglycerin comprises the rapid conversion of nitroglycerin into other substances, such as nitrogen, carbon dioxide, and water vapor, through a chemical reaction. The chemical composition of nitroglycerin changes during the explosion. So, the exploding of nitroglycerin is a chemical process.

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Most popular questions from this chapter

In the United States, water used for irrigation is measured in acre-feet. An acre-foot of water covers an acre to a depth of exactly 1 ft. An acre is 4840 yd. An acre-foot is enough water to supply two typical households for 1.00 yr. (a) If desalinated water costs \(\$ 1950\) per acre-foot, how much does desalinated water cost per liter? (b) How much would it cost one household per day if it were the only source of water?

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