Question:
The options are;
a. 10. mL of 1 M HCl(aq) at 10.oC
b. 10. mL of 1 M HCl(aq) at 25oC
c. 10. mL of 3 M HCl(aq) at 10.oC
d. 10. mL of 3 M HCl(aq) at 25oC
Answer:
The correct option is;
d. 10 mL of 3 M HCl(aq) at 25 °C
Explanation:
Factors that influence the rate of the reaction include;
Concentration and
Temperature
Concentration
An increase in concentration leads to a increased number of interaction among the the reacting components of HCl and iron filings such that the number of effective interaction or the rate of the reaction increases, therefore, a 10 mL 3 M HCl will react faster than a 10 mL of 1 M HCl.
Temperature
When the temperature of the reacting HCl is increased, the energy within the reacting system increases leading to an increase in the number of high energy collisions which results in an increased reaction rate, therefore, HCl at 25 °C will react faster than HCl at 10 °C.
Hence the correct option is 10 mL of 3 M HCl(aq) at 25 °C.
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Answer is: enthalpy is -1276,8 kJ.
Chemical reaction: 2CH₃OH(l) + 3O₂(g) → 2CO₂(g) + 4H₂<span>O(g).
</span>ΔH(CH₃OH) = -238,7 kJ/mol.
ΔH(H₂O) = -241,8 kJ/mol.
ΔH(CO₂) = -<span>393,5 kJ/mol.
</span>ΔH(O₂) = 0 kJ/mol.
ΔHreaction = ∑ΔHproducts - ∑ΔHreactants
ΔHreaction = (2·(-393,5) + 4·(-241,8) - (2·(-238,7))
ΔH = (-787 - 967,2) + 477,4
ΔH = -1276,8 kJ.
The given blanks can be filled with meteorology, atmosphere, biosphere, SI, and scientific notation.
In the field of meteorology, scientists measure the pressure, temperature, and humidity. Their measurements come from the characteristics of the atmosphere, and hydrosphere, and they look at how the weather influences the biosphere and the geosphere. The units of their measurements come from SI and the metric system. The numbers usually are not large, so scientific notation is not used.
