Question

How can you tell if a lab thermometer contains mercury, a toxic substance?

A. The liquid would appear black.
B. The liquid would appear silver.
C. The thermometer is made of glass.
D. The thermometer is made of plastic.

Answer 1

B and C because:

- mercury is a metal so it will appear silver

- mercury will be in most old thermometers, which are made from glass

Answer 2

1. Option B. The liquid would appear silver

2. Option A. The liquid would appear black.