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How To determine if a reaction is exothermic a student should use a?
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What is the heat balance equation for a exothermic reaction?
For an exothermic reaction, heat should appear as a product since heat is given off. Thus, it would be A + B ==> C + D + heat
How do you know it is a exothermic reaction?
If you are in a lab and want to tell whether a reaction was exothermic, carefully check the temperature of the reaction vessel. If the reaction was exothermic, the vessel will be warmer than it was before the reaction occurred. If you are looking at a reaction on paper, you will need a table of thermodynamic data. It should contain the molar enthalpies of formation, represented by H, of each of the reactants and products (note: if a reactant or product is an element in its most stable state, like H2(g) or Zn(s), the enthalpy of formation is defined as zero, so they may be left out of the table). Multiply the number of moles of each product and reactant by its molar enthalpy. Add up all the results for the products and subract all the results for the reactants. If your net result is negative, the reaction was exothermic. If it is positive, the reaction was endothermic. Example: CH4(g)+2O2(g)-->CO2(g)+2H2O(g) Delta H (kJ/mol) CH4(g) -74.8 O2(g) 0 CO2(g) -393.5 H2O(g) -241.82 Products: 2(-241.82)+(-393.5)= -877.14 kJ Reactants: -74.8+2(0)= -74.8 kJ Total: -877.14-(-74.8)= -802.34 kJ The reaction was exothermic.
What compound does sodium and water make?
The reaction is: 2 Na(s) + 2H2O(l) = 2 NaOH(aq) + H2(g) So, the compound made is sodium hydroxide. It is an exothermic reaction and you can get fire. You should be very careful.
Do a chemical reaction produce heat and light?
Chemical reactions can produce heat and energy but not all chemical reactions produce them. Exothermic reactions produce heat and energy (possibly in the form of photons/light), while endothermic reaction absorb them.
Is fermentation an exothermic or endothermic process?
It is exothermic reaction. Why should bacteria go and spend energy to ferment any thing should a question, come to your mind. I view the situation in terms of the energy levels. In a typical glucose fermentation, you start with high energy glucose. The final product after, for example human digestion is considered, is low energy carbon dioxide and water. Some way down the slippery slope you have alcohol, i.e. energy has been lost = exotherm. To give an example, a typical beer fermentation can increase in temperature at the rate of 0.6'C per hour, but this depends on the fermentation temperature, the yeast and the amount of glucose present. Without cooling, the temperature of the fermentation increases such that the character of the final prodcut is adversely affected.
Is the reaction between sodium and water endothermic?
it is exothermic because heat is liberated to the surrounding during the chemical reation
What is the heat balance equation for a exothermic reaction?
For an exothermic reaction, heat should appear as a product since heat is given off. Thus, it would be A + B ==> C + D + heat
Should you pour water slowly into acid?
Always pour acid to water, as the dilution of acid is exothermic reaction.
How is destroyed?
by the addition of alcohol. however this should be done with extreme caution as it is highly exothermic reaction and may even catch fire.
Should intelligence tests affect how schools handle student?
No. Intelligence tests cannot determine how sucessful a student can be.
Is the neutralization of hydrochloric acid an exothermic or endothermic reaction?
ExothermicNeutralizing or even diluting a concentrated acid can be very exothermic. It can even cause the solution to boil if you are not careful! This is extremely dangerous! This is why when diluting concentrated acids (any kind) you should ADD ACID TO WATER and not the opposite.See the link below for more information about this important safety issue in the laboratory due to the exothermic nature of this reaction.
How is sodium destroyed?
by the addition of alcohol. however this should be done with extreme caution as it is highly exothermic reaction and may even catch fire.
How do you know it is a exothermic reaction?
If you are in a lab and want to tell whether a reaction was exothermic, carefully check the temperature of the reaction vessel. If the reaction was exothermic, the vessel will be warmer than it was before the reaction occurred. If you are looking at a reaction on paper, you will need a table of thermodynamic data. It should contain the molar enthalpies of formation, represented by H, of each of the reactants and products (note: if a reactant or product is an element in its most stable state, like H2(g) or Zn(s), the enthalpy of formation is defined as zero, so they may be left out of the table). Multiply the number of moles of each product and reactant by its molar enthalpy. Add up all the results for the products and subract all the results for the reactants. If your net result is negative, the reaction was exothermic. If it is positive, the reaction was endothermic. Example: CH4(g)+2O2(g)-->CO2(g)+2H2O(g) Delta H (kJ/mol) CH4(g) -74.8 O2(g) 0 CO2(g) -393.5 H2O(g) -241.82 Products: 2(-241.82)+(-393.5)= -877.14 kJ Reactants: -74.8+2(0)= -74.8 kJ Total: -877.14-(-74.8)= -802.34 kJ The reaction was exothermic.
Why is a water bath used in grignard reagent?
Because the reaction is a strongly exothermic process. An ice bath should be kept readily available in case it should become necessary to cool the mixture to keep the reaction under control.
What is the temperature that should be maintained to proceed the reaction of sodium hydroxide with hydrochloric acid?
The problem is to keep this very exothermic reaction cooled down.It even runs very fast is ice water.
How do you grade a paper?
Look at what the student/person did, and then you can determine what the person's score should be.
Why would the condensation of steam be considered an exothermic process?
When a liquid substance is heated, it changes to a gas. Thus the opposite should happen when the substance becomes liquid again, i.e. when it is cooled it changes to liquid (it condenses). So as it condenses it cool down (which means it give away heat from its body). As heat is given up, during the process, it is an exothermic reaction.
