Please help! 1. how to Classify elements as atomic or molecular.
2.how to classify compounds as ionic or molecular.

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution. calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.

Ahypothesis must be testable and falsifiable to be considered scientific a. trueb. false