(15 points) will mark branliest if ! imagine you are trying to determine whether chemicals r and s are similar. a) separately, you react r and s with chemical x and each produced a color change from red to yellow. at this point, do you think r and s are similar? how similar? this point, do you think r and s are similar? how similar? are similar? how similar? b) now r and s are reacted separately with y. r makes a black precipitate while s has no reaction. at c) now r and s are reacted separately with z. both produce a gas. at this point, do you think r and s

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.

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

Select the correct location on the image identify the element that humans need to breathe. 2015 er r ights reserved