Henry mixed salt and water together in a cup until he observed a clear solution. he measured the mass of the solution. then he placed the cup outside for several sunny days during the summer. after a week, he observed that only solid salt remained in the cup and the mass had decreased. henry concluded that a physical and chemical change occurred in this investigation. which statements correctly defend or dispute his conclusion? 1- he is correct. dissolving salt in water is a physical change, but evaporating the water is a chemical change. formation of a solid is evidence that a chemical change occurred. he is correct. evaporation is a physical change, but dissolving salt in water is a chemical change. the change in mass is evidence that a chemical change occurred. 2- he is incorrect. dissolving salt in water and evaporation of the water are both physical changes. the reappearance of salt is evidence that the change was reversible by a physical change, so it could not be a chemical change. 3- he is incorrect. dissolving salt in water and evaporation of the water are both chemical changes. the reappearance of salt is evidence that the change was reversible by a chemical change, so it could not be a physical change.
Answers: 1
Chemistry, 21.06.2019 23:10
Nitrogen (n), phosphorus (p), and potassium (k) are the main nutrients in plant fertilizers. according to an industry convention, the numbers on the label refer to the mass percents of n, p2o5, and k2o, in that order. calculate the n: p: k ratio of a 30: 10: 10 fertilizer in terms of moles of each element, and express it as x: y: 1.0.
Answers: 1
Chemistry, 22.06.2019 00:40
During which time interval does the object travel approximately 10 meters
Answers: 3
Chemistry, 22.06.2019 13:30
How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.
Answers: 1
Chemistry, 22.06.2019 14:30
Select all that apply. using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 (s) pb+2(aq) + 2cl -(aq). the concentration of the products yield a ksp of 2.1 x 10-2:
Answers: 2
Henry mixed salt and water together in a cup until he observed a clear solution. he measured the mas...
Mathematics, 11.12.2019 08:31
Mathematics, 11.12.2019 08:31
Social Studies, 11.12.2019 08:31
Mathematics, 11.12.2019 08:31
Mathematics, 11.12.2019 08:31
Social Studies, 11.12.2019 08:31
Mathematics, 11.12.2019 08:31
Mathematics, 11.12.2019 08:31
Mathematics, 11.12.2019 08:31