Multiple Choice
How many calories are needed to raise the temperature of 32g of water from 12 degrees Celsius to 54 degrees Celsius?
1. Intro to General Chemistry
Temperature
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At what temperature does agar solidify?
A
90-100°C
B
32-40°C
C
50-60°C
D
70-80°C
Verified step by step guidance1
Understand the context: Agar is a gelatinous substance derived from seaweed, commonly used in microbiology as a culture medium. It is important to know the temperature at which it solidifies to ensure proper handling and use.
Identify the key property: Agar solidifies at a specific temperature range. This is crucial for its application in laboratory settings where it needs to be solid to support microbial growth.
Recognize the typical solidification range: Agar typically solidifies between 32-40°C. This is lower than its melting point, which is around 85-95°C, allowing it to be poured as a liquid and then solidify at room temperature.
Consider practical implications: Knowing the solidification temperature helps in planning experiments and ensuring that agar plates are prepared correctly for microbial cultures.
Apply this knowledge: When preparing agar, ensure it is cooled to the solidification range of 32-40°C before use to maintain its integrity and functionality in experiments.
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