Chemical and Physical Properties Essay Example for Free

chemical and Physical Properties EssayObserve the solubility in hot pee. c. Tear off approximately 1/2-cm pieces of both inflamed and moody litmus paper. d. Allow the solution to chill, and using the glass soul-stirring rod, head a drop of the solution onto a piece of litmus paper. enter the results. Clean the stirring rod. 5. third base examen tube a. add up a few pipet drops of HCl (hydrochloric acid) to the sample and stir. NOTE Use the sieve tube holderclamp as some replys are exothermic, i. e. the test tube may get very hot. Record any apparent reaction or solubility. Clean the stirring rod. 6.Fourth test tube Add a few pipet drops of NaOH (sodium hydroxide) to the sample. Stir. Record any apparent reaction or solubility. Clean the stirring rod. 7. Thoroughly clean and dry all 4 test tubes. Repeat Steps 2 though 6 with the next substance. Experimental Results Substance Zn discolor Grey Odor None pitch of catch fire decreases content curled in with lighter colo r Solub. Or reaction w/ cool H20 No reaction observed / non water-soluble Solub. Or Reaction w/ hot H20 protracted boiling from retained heat/ non soluble litmus test None observed stretch out HCI positivist reaction resulting in the formation of gas, carbonation, and darkened Dilute NaOH creates foggy substance and blackens solid Substance Cu Color Copper Odor None noted ensnare of groove Turned black Solub. Or Reaction w/cold H20 not soluble Solub. Or Reaction w/ hot H20 not soluble Litmus test None observed Dilute HCI tarnished not observed Dilute NaOH no(prenominal) observed Substance Mg Color Silver Odor None observed Effect of Heat increases in dullness Solub. Or Reaction w/cold H20 no reaction observed/ non soluble Solub.Or Reaction w/ hot H20 increased heat / non soluble Litmus test no convert Dilute HCI rapid boiling and heat Dilute NaOH liquid is cloudy Substance MgO Color White Odor None observed Effect of Heat no(prenominal) observed Solub. Or Reaction w/cold H20 dissoluble Solub. Or Reaction w/ hot H20 Soluble Litmus test Red paper turned blue / blue no reaction Dilute HCI Carbonated Soluble Dilute NaOH Dense Soluble Substance CuC03 Color Green Odor pungent Effect of Heat turned black Solub. Or Reaction w/cold H20 about murky, but does not bulge out solubleSolub. Or Reaction w/ hot H20 slightly murky, but none soluble Litmus test changes blue to red showing slight acidity Dilute HCI carbonation and soluble Dilute NaOH turns blue w/ slight soluble Substance Cu(NO3)2 Color Blue crystals Odor slight odor Effect of Heat melted and turned green Solub. Or Reaction w/cold H20 turned water blue and is soluble Solub. Or Reaction w/ hot H20 no change observed from the cool water and is soluble Litmus test blue litmus turned to red for acid Dilute HCI turned green Dilute NaOH soluble formed Substance NaClColor white crystals Odor none observed Effect of Heat none noted Solub. Or Reaction w/cold H20 becomes slightly soluble Solub. Or Reaction w/ hot H20 fully soluble Litmus test red turns to blue indicating that its basic Dilute HCI none observed Dilute NaOH none observed QUESTIONS A Did you observe any chemical changes in this experiment? Chemical changes are observed during the experiment B What evidence did you use to decide that something was a chemical change? Indications of chemical changes were preceded by the burning, rusting, ermenting, and decomposing of the substances. As a result, a parvenue substance will have its own unique somatogenetic properties C separate at least two examples of chemical changes you observed. Adding colorless sodium hydroxide to blue copper(II) nitrate produces a light blue precipitate Zinc diluted with Hydrogen Chloride is positive for a chemical reaction resulting in the formation of gas, carbonation, and darkened D Classify the following properties of sodium metal as sensual or chemical Silver metallic color physical Turns gray in air chemical Melts at 98oC physicalReacts e xplosively with chlorine chemical E Classify the following changes as physical or chemical Water freezes at OoC physcical change Baking soda when combined with vinegar produces bubbles- chemical change Mothballs gradually disappear at room temperature physical change Ice cubes in a freezer get smaller with time physical change Baking soda loses mass as it is heated physical chemical Tarnishing of silver chemical change F How would you show that dissolving control board salt is a physical change? A physical change will not change the composition of a substance.When adding water to a salt, the ions of table salt are hydrated with water molecules which trim back the strong electrostatic forces of the ions. To return salt to the original state, simply remove the hydrated water molecules by boiling the table salt. Conclusions In a chemical change one or more new substances are formed. The new substance has its own unique identity which is different from the original. It has pro perties that are different than those of the starting time material in addition, the original materials is not able to be reproduced by physical means.