Final answer:
To verify the accuracy of a thermometer, it should register 32°F when placed in a mixture of crushed ice and water which is the freezing point of water on the Fahrenheit scale.
Step-by-step explanation:
To check the accuracy of a thermometer, you can place it in a cup of crushed ice and water. When you do this, the thermometer should register a certain temperature, which indicates that the thermometer is reading temperatures correctly. The freezing point of water on the Fahrenheit scale is 32°F, so this is the temperature the mixture should register if the thermometer is accurate.