Question

hot glass looks the same as cold glass. *
true
false

all chemicals in the lab are to be considered dangerous. *
true
false

Explanation:

• For the first statement, hot glass and cold glass have the same visual appearance. There is no visual cue (like color change in most common lab - glass materials) to distinguish a hot glass from a cold one just by looking.
• For the second statement, in a laboratory setting, it is a fundamental safety principle to assume all chemicals are dangerous. This is because even if a chemical seems harmless at first glance, it may react with other substances in the lab environment, or there could be unknown impurities.

Answer:

• First question: A. True
• Second question: A. True