Atoms. A 0.0106-mol sample of urea, NH 2CONH 2. contains
O a. 2.55 x 10 22 molecules.
Ob.5.10 x 10 22
O c. 2.55 10 23
O d. 1.06 x 10 24
atoms.
O4.6.02 10 23 molecules. .
atoms.

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

Seltzer water is created by placing water under pressure with carbon dioxide gas. which of the following statements best describe seltzer water: a. the solution will be slightly acidic b. the solution will be slightly basic. the solution will be strongly acidic. d. the solution will be strongly basic. e. the solution will be neutral

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