Mr. Wurtz performed a demonstration for his science students in a well-ventilated room. He mixed together two samples of different white powdery substances in an
open beaker. The dry mixture soon became wet, and the students could smell
ammonia. The temperature of the beaker dropped dramatically, so much so that the
liquid that formed in the beaker began to freeze.

A liquid formed at the bottom of the beaker

The temperature of the mixture dropped dramatically

A gas with strong smell was released from the mixture

The powdery substance dissolved in the water

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

c. is the answer

by love gaming

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.