12. choose the best answer. examples of alloys include steel, colored gold, and __. oxygen brass iron helium…

12. choose the best answer. examples of alloys include steel, colored gold, and __. oxygen brass iron helium 13. choose the best answer. which state has viscosity and a defined volume but lacks a defined shape? liquid solid gas plasma

12. choose the best answer. examples of alloys include steel, colored gold, and __. oxygen brass iron helium 13. choose the best answer. which state has viscosity and a defined volume but lacks a defined shape? liquid solid gas plasma

Answer

Brief Explanations:

  1. An alloy is a mixture of metals or a metal and non - metal. Brass is an alloy of copper and zinc. Oxygen, iron, and helium are not alloys.
  2. Liquids have viscosity (resistance to flow), a definite volume, but take the shape of their container, lacking a definite shape of their own. Solids have a definite shape and volume, gases have no definite shape or volume, and plasma is a high - energy state with unique properties different from the other three.

Answer:

  1. B. brass
  2. A. liquid