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Chemistry Rate Rxn Lab

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Chemistry Rate Rxn Lab

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  • October 29, 2008
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REACTION RATES LAB

PURPOSE
- the purpose of this lab is to observe how different factors effect the rate of reaction in different reactions. - refrences: handout- "factors that affect reaction rate"

DATA

STATION reaction/variablereaction timeobservations

1Mg ribbon in HCL/3M HCL - 0:053M - reacted rapidly
concentration (M)1M HCL - 1:461M - dissolved slowly

2Alka-seltzer in water/Hot water - 1:20Hot- turned blue veryfast and dissolved quickly
Cold - slowly reactedtemperature (C°)Cold water - 3+ mins

3metals in HCL/Mg- 0:36Mg- dissolved fast
type of metalZn- 3+ minZn- dissolved slowly
Cu- 3+ minCu- no visible rxn

4Marble in HCL/marble chip: 3+ minChip- slowly dissolved
surface area of solutepowder- 2:26 secPowder- quickly dissolved

5Decomposition ofN/AWhen MnO2 was added the H2O2 turned black and bubbled.
H2O2/ Catalyst (MnO2)

CONCLUSION
In this lab we took reactions and added different factors to them to see how the rate of reaction was affected. In station 1 we dissolved Mg ribbons in 3M and 1M solutions of HCL. The ribbon dissolved in the 3M HCL in 5 seconds, while the ribbon in the 1M HCL dissolved in 1 minute 43 seconds. This proved that higher concentrations speed up reactions.

In station 2 we put 1/4 of an aska-seltzer tab in hot water and another one in old water. The tab in hot water dissolved much faster than the tab in the cold water. This proved that the higher the temperature, the faster the reaction will be.

In station 3 we put different metals in 3M HCL; Mg, Zn, and Cu. The Mg dissolved in 31 seconds, the Zn took over 3 minutes and the Cu had no visible reaction. This proved that different types of metals dissolve and react at different rates.

In station 4 we put a marble chip in 1M HCL and powdered marble chips in 1M HCL. The marble powder took 2:32 minutes to dissolve while the...