Why do solids maintain a specific shape and volume?

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

Draw the aromatic compound toluene (methylbenzene). show all hydrogen atoms, including those on the ring.