This lab question is: How can you distinguish a physical change from a chemical change? Which statements below are an appropriate hypothesis in response to this question? Check all that apply.
If a substance changes state of matter (e. g., liquid to gas), then this is a physical change because the
original properties of the substance have not changed.
If a substance undergoes a physical change, then it will retain most of its original properties because
no new substance is formed.
If a substance undergoes a chemical change, then it will not retain its original properties because a
new substance is formed.
If a precipitate is formed when two substances are mixed, then a chemical change has taken place
because precipitates are new substances.

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.

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

Which two scientific disciplines are bridged by pharmaceutical drugs? chemistry and forensics chemistry and medicine biology and forensics biology and criminology