Which of the Following Changes Represents a Physical Change, Rather

question 15

Multiple Choice

Which of the following changes represents a physical change, rather than evidence of a chemical reaction?

• A)When water and a yellow solution of antifreeze are mixed, the resulting solution is a lighter shade of yellow than the original antifreeze solution.
• B)When concentrated HNO₃ is placed in contact with copper metal, a brown gas is formed, the copper dissolves, and a green solution is formed.
• C)When an egg is fried, the clear part becomes white, and the egg becomes a solid.
• D)When a piece of zinc metal is placed in a blue solution of copper sulfate, the solution turns from blue to colorless, the zinc dissolves, and copper metal is formed.
• E)When solutions of AgNO₃ and NaCl are mixed, a white solid forms.

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Definitions:

CPI

A calculation tool, the Consumer Price Index, measures the mean prices of a selected basket of consumer services and goods including food, transportation, and medical services via their weighted average.

Prices Increase

A rise in the general level of prices for goods and services in an economy over a period of time, often indicating inflation.

Unemployment Rate

The portion within the labor force actively seeking work yet remains unemployed.

Employed

Refers to individuals who are currently working for pay or profit, including full-time and part-time positions, as well as temporary and seasonal work.