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Chemistry, 23.06.2019 04:10
Two solids are mixed in a flask and stirred. after a few minutes, the flask becomes cold. which of the following best describes this reaction? a. an exothermic reaction b. a combustion reaction c. an endothermic reaction d. a decomposition reaction
Answers: 1
Chemistry, 23.06.2019 07:00
An unknown substance is a white solid at room temperature and has a melting point of 78 °c. which of the following substances is most likely to be the identity of the unknown sample? a. naphthalene, a molecular solid with the formula c10h8 b. silica, a network solid held together by covalent bonds with the formula sio2 c. calcium chloride, an ionic compound with the formula cacl2 d. water, an molecular compound with the formula h2o
Answers: 2
Chemistry, 23.06.2019 16:00
Afuel has 30.43% nitrogen and 69.57% oxygen. find the molecular formula of the compound if it has a mass of 92 grams per mole a.no b.n2o4 c.no2 d.n4o8
Answers: 1
This is dimensional analysis- question: you spend 230 minutes in chemistry class each week. how man...
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