4 As water and sulfuric acid are mixed together the temperature of the mixture becomes very hot. Select the statements
that best describe why this happens. Assume that both substances start out at room temperature and there is no
external heat source affecting them.
AA chemical reaction is occurring.
Energy is released during the chemical reaction.
C Energy is absorbed during the chemical reaction.
D No chemical reaction occurs because water is inert.
E The lack of a chemical reaction causes the temperature to increase.

What is the number of moles in 15.0 g ash3?

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.

Compare and contrast physical changes with chemical changes.