8/17/2019 Action of Catalysts by Kacelyn-da0ugfa

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Anna Le 10A

Action of Catalysts

Aim: To investigate whether manganese oxide and other substances act as

catalysts for the decomposition of hydrogen peroxide.

Hypothesis: All catalysts will work quickly toward the decomposition of the

hydrogen peroxide.

Materials:

  !0mL "eaker

  #resh $ydrogen %eroxide &olution '()*

  + test tubes

   Test tube rack

  ,ron -llings

  &anddust

  #resh potato

  %iece of liver  &tring or taper

 

&patula

  /anganese dioxide

  ropper

Method:

1. Added mL of $ydrogen %eroxide along with drops of detergent to a test

tube.

. $alf-lled a beaker with hot water. %ut the test tube in the hot water andobserved.

(. %ut mL of $ydrogen %eroxide in a second test tube and added a small

amount of manganese dioxide powder.2. Lit one end of the piece of string3 then blew it out so that it had a glowing

tip into the test tube.!. 4bserved what was left around the mouth of the test tube.+. 5epeated the experiment using other substances instead of manganese

dioxide.

Results:

6ATAL7&T 4"&859AT,4: ;

544/ T8/%.

4"&859AT,4: ,:

$4T 8::4 6ATAL7&T No reaction No reaction None/A:>A:8&8

,4=,8

Formed a

precipitate or

foam (black and

white)

nlar!ed"rose None

%4TAT4 Fi##in!"foamin! More foam NoneL,985 Heatin! up$ fast

reaction$ yellowand white foam

Foam is risin!

fast

None

8/17/2019 Action of Catalysts by Kacelyn-da0ugfa

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Anna Le 10A

&A: No reaction No reaction None,54: #,LL,:>& Fi##in! Fi##in! faster None

%iscussion:

1. The hydrogen peroxide was heated in step because it was needed to

observe the reaction inn hot water vs. room temperature.. 7es the manganese oxide did act as a catalyst because it reacted fast

compared to other catalysts.(. A foam was formed when the hydrogen peroxide decomposed.2. $4'aq* ? $4'aq* $4'aq* ? $4'aq*!. , predict that it will remain the same way because it did not react without

a catalyst.+. The best catalyst for the decomposition of hydrogen peroxide was liver.

Conclusion:

 The aim was achieved as the investigation showed that the liver and manganese

dioxide worked best as catalysts for the decomposition of hydrogen peroxide. ,t

was hypothesised that all the catalysts would work quickly but the hypothesis

was proven wrong as only two catalysts worked fast. The results showed that all

the catalysts showed no presence of oxygen and that hot water boosts the rate

of reaction. 8rrors with this investigation included the fact that the dropper was

di@cult to -nd the exact measurement of mL. :ext time this could be -xed with

a dierent measurement tool.