Calcium hydroxide, used in concrete, will break into what when heated?

What are the percent by mass of copper in penny lab

What material does not melt at any temperature

Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.