PLEASE ANSWER

Mary put 5 cups of water in a pan and placed it on the stove. She let it boil for 10 minutes. She measured the water again and discovered she only had 4 cups of water. What happened to the missing water?

A. 1 cup of the water must have condensed and is now in the air.
B. Mary must have not measured correctly since water cannot be destroyed.
C. 1 cup of water was destroyed by the heat.
D.1 cup of water became gas and is now in the air.

Consider three unlabeled bottles, each contain small pieces of one of the following metals. - magnesium - sodium - silver the following reagents are used for identifying the metals. - pure water - a solution of 1.0 molar hcl - a solution of concentrated hno3 (a) which metal can be easily identified because it is much softer than the other two? describe a chemical test that distinguishes this metal from the other two, using only one of the reagents above. write a balanced chemical equation for the reaction that occurs. (b) one of the other two metals reacts readily with the hcl solution. identify the metal and write the balanced chemical equation for the reaction that occurs when this metal is added to the hcl solution. use the table of standard reduction potentials (attached) to account for the fact that this metal reacts with hcl while the other does not. (c) the one remaining metal reacts with the concentrated hno3 solution. write a balanced chemical equation for the reaction that occurs. (d) the solution obtained in (c) is diluted and a few drops of 1 m hcl is added. describe what would be observed. write a balanced chemical equation for the reaction that occurs.