Chapter 1, Problem 1.40EP

Indicate whether each of the following samples of matter is a heterogeneous mixture, a homogeneous mixture, a compound, or an element.

1. a. a colorless gas, only part of which reacts with hot iron
2. b. a uniform red liquid with a boiling point of 60°C that cannot be broken down into simpler substances using chemical means
3. c. a yellow solid, all of which melts at a temperature of 45°C to produce a liquid that decomposes upon further heating
4. d. a single-phase liquid that completely evaporates without decomposition when heated to produce a gas that can be separated into simpler components using physical means