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Classifying Reactions Lab

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by

Aurora Rodriguez

on 15 December 2015

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Transcript of Classifying Reactions Lab

Classifying Reactions Lab
Part 1 of the lab:
Part 3
Part 4
Observations:
Appearance after initial mixing:


Appearance after 30 minutes:



Analysis/Conclusion:
1. Balance the equation, if necessary, for the reaction between magnesium sulfate and
ammonia.
MgSO4 + 2NH4OH → (NH4)2SO4 + Mg(OH)2
Mg-1 Mg- 1
S-1 S- 1
O-6 O- 6
N-2 N- 2
H-10 H- 10


2. Classify the reaction between magnesium sulfate and ammonia.
The classification of the reaction between sulfate and ammonia is a double replacement.

3. What evidence was there to indicate that the Epsom salts and ammonia reacted?
The substances of Epsom salts and ammonia created a chemical reaction. The evidence of the reaction is shown in the edge of the penny. The edge of the penny turns color showing that there was a chemical reaction.



Part 4 Answers
Observations:
Appearance of penny in vinegar after 30 minutes:
The penny’s copper coating is not affected and remains a golden color. Although, the scraped off portion of the penny showing its zinc center did turn color. Instead of its once silvery color the edge of the coin is kind of a gross green color showing that it was corroded by the vinegar.
Analysis/Conclusion:
1. Balance the equation, if necessary, for the reaction between zinc and acetic acid.

Zn + HC2H3O2 → Zn(CH3COO)2 + H2
Zn + 2HCH3COO  H + ZnCH3COO


2. Classify the reaction between zinc and acetic acid.
The Chemical reaction that occurred is called Single Replacement.


3. What evidence was there that a reaction was taking place?
The two substances, zinc and acidic acid, shown in the chemical equation prove that there was a chemical reaction that took place. This is because the substances mixed together to create something new.

Name
Part 2
Part 2 Answers
Observations:
Appearance of potato and hydrogen peroxide combination:
1. The Hydrogen Peroxide is fizzing and bubbling on the Potato. This means a chemical reaction is occurring and gasses are being produced.
2. Smells like potato




Analysis/Conclusion:
1. The potato (as well as the yeast and beef liver) contains an enzyme called catalase, which breaks down hydrogen peroxide. Balance the equation, if necessary, for the following reaction.
2H2O2 → 2H2O + 1O2
H-4 H-4
O-4 O-4


2. Classify this reaction that occurred.
The chemical reaction that occurred is called Decomposition.


3. What evidence was there that a reaction was taking place?
The substances shown in the chemical equation show both the product and its reactants. This proves that there was a reaction. The substances came together and broke apart to create new products.


Part 1 Answers:
Observations:
Day
Appearance of Steel Wool
1 The water is warm and is surrounding the opening part of the jar. The jar is transparent and foggy because of the water being trapped inside at a warmer temperature. The jar is upside down. The Steel wool is in the top corner of the jar, The steal wool is stiff and ruff. The steel wool is a silvery grey.
2 The water level appears to have gone down a little bit; but not much at all. The steel wool seems to have no change. The steel wool is still a silvery grey color. The jar has water droplets inside of it and is less foggy than it was on day 1. Overall, there is little to no immediate change that has occurred.
3 The water level has decreased slightly and gone into the jar. The tape holding the steel wool continues to lose its sticky-ness because of the humidity. The steel wool is still mostly a silvery grey; however, it is beginning to rust and has some brown spots on the steel wool.
4 The water level seems to have decreased a little more. The steel wool is becoming very rusty. The steel wool has brown blotches all over. The humidity and evaporation of the water is causing the steel in the steel wool to rust.
5 The water level has gone down a lot compared to day 1. The steel wool is pretty rusty. The steel wool seems to be consumed more by the brown blotches rather than the fresh clean silvery grey color.


Analysis/Conclusion:

1. Balance the equation, if necessary, for the reaction between iron and oxygen.
4Fe + 3O2 → 2Fe2O3
Fe- 4 Fe- 4
O-6 O- 6
2. Classify the reaction that occurred between the iron and oxygen.
The chemical reaction that occurred is called Combination or Synthesis.


3. What evidence was there that a reaction took place?
The elements Iron and oxygen shown on the chemical reaction prove that there was a chemical reaction because the two elements mixed together to create a new substance. The equation shows both a product and the reactants proving that the chemical reaction took place.

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