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After test I found that Exothermic and Endothermic are opposites. The forth reaction was the most Exothermic ( +4°) and the third was the most endothermic (-4,5°).

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In this reaction we can see how temperature in exothermic reactions increase in exothermic reaction or it's endothermic how the temperature decreas.

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The biggest temperature change we found was 4°C. It was the reaction of Hcl+Nahco3 ----- Nacl + Co2 +H20 and on the reaction of 2hcl

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Exothermic: 2HCl + Na2CO3 -> 2NaCl + CO2 + H2O
HCl + NaOH -> NaCl + H2O
These two reactions both have a increased temperature of 3 degrees and 5.5 degrees
Endothermic: NaHCO3+HCl -> NaCl + CO2+ H2O
(NH4)2SO4 + H2O -> 2NH4OH + H2SO4
These two reactions both have a decreased temperature of 5 degrees and 2.5 degrees

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We could have made the experiment more fairer by using the same amount of water and powders

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After doing this experiment we can see that

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Reaction 1 and 4 were Exothermic. Reaction 2 and 3 were Endothermic

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After these 4 tests, I found out that HCl + NaCO3, and HCL + Mg are Exothermic , and that HCL + NaHCO3, and Ammonium are Endothermic.
For the first equation, we started at an average of 22 degrees Celsius. Then it went up by 2 degrees.
The 4th equation, was quite similar too.
The 2nd equationsttarted at an average of 22 degrees Celsius. Then it went down by 4 degrees Celsius.
The 3rd equation was quite similar too.

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I found that HCL+NaOH --> NaCl+H2O was ment for hotpack

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Experiments 4 and 1 are exothermic reaction because they increase thems temeperature

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I found out that equation 1 and 4 released more energy

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Ammonium nitrate is an endothermic reaction, taking in heat from the outside

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I found that the magnesium reaction with acid released the most energy as it recorded the largest temperature increase (6 degrees celsius)