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Observations of Chemical Changes

Autor:   •  September 24, 2012  •  Essay  •  605 Words (3 Pages)  •  1,402 Views

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Experiment: To examine the reactions of some common chemicals contained in

Consumer products and observe the macroscopic changes these chemicals undergo. Examining reactions of common chemicals contained in consumer products. In this lab, it will show the macroscopic changed the chemicals undergo.

Objective: To observe some properties of chemical reactions and to associate chemical properties with household products.

Chemicals used in this lab were: Ammonia (NH3) Bromthymol Blue (BTB), Copper (II) Sulfate(CuSO4), FDC Blue Dye #1, Hydrochloric acid (HCl), Lead (II) Nitrate(Pb(NO3)2), Phenolphtalein Solution- (C20H14O4 ), Potassium Iodide (Kl) Silver Nitrate(AgNO3), Sodium Bicarbonate(NaHCO3), Sodium Hydroxide (NaOH), Sodium Hypochlorite(NaClO), Starch Solution.

Also used for this experiment were house hold items.

Exp. Procedure: The procedure was to combine the chemicals using the 96 well-plate for each combination. 2 Pipet drops of the first chemical in one well and then adding 2 drops of the second chemical. Some of the combinations had asked for 3 chemicals and not 2 drops for everyone. Also needed were, a piece of white paper, a piece of black paper, and the chemicals from the Observation of Chemical Changes Experiment Bag. For ever reaction, I wrote down the chemical combination, the well number, and my observations of the reactions against the white and dark backgrounds.

Well#/Question Chemicals Reaction

A1/A

NaHCO3 & HCl - CO2

The reaction with these chemicals, I had seen small white bubbles, both background white and black shows the same type of change.

B1/B

HCl & BTB

For this reaction, it had turned yellow.

On white paper is was bright,

On black paper it was mustard looking/ yellow.

C1/C

NH3 & BTB

These two chemicals it had turned a very light blue on the white paper. On the black paper it looked dark blue, there was no actual chemical change.

D1/D

HCl & BTB

After mixing these two chemicals, it had turned green. It stayed green on the white paper, and when

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