An electrolyte is a substance that conducts electricity when dissolved in water because it dissociates into ions. Out of the given compounds, H2SO4 and KOH are electrolytes because they fully ionize in solution, while C2H5OH and CH4 are not.
An electrolyte is a substance that, when dissolved in water, enables the solution to conduct electricity. It does so because the compound breaks apart into ions, which can carry a charge. To find out which compounds are electrolytes, we look at whether or not they dissociate into ions in solution.
Out of the options given:
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The pH of a 0.027 M KOH solution is 12.4 and since KOH is a strong base it will dissociate completely in the solution
KOH is a strong base, so it will dissociate completely in solution to form potassium ions and hydroxide ions. The concentration of hydroxide ions will be equal to the concentration of KOH, which is 0.027 M.
The pH of a solution can be calculated using the following equation:
pH = -log[H+]
where [H+] is the concentration of hydrogen ions in the solution.
The concentration of hydrogen ions in a basic solution is very low, so we can use the approximation that:
pH = 14 - log[OH-]
pH = 14 - log(0.027)
pH = 12.4
Learn more about hydrogen ions at:
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The 90 percentage of atoms in the entire universe are hydrogen atoms.
learn about hydrogen atoms,
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Given:
KOH used to make 1.6 liters of 15% by mass solution with water
Required:
grams of KOH
solution:
the density of KOH is equal to 2.12 kg/L
multiply the known volume of KOH to the density and the percentage of KOH in water
mass of KOH = 1.6 L (2.12 kg/L)(0.15) = 22.61 grams of KOH
A Energy to break bonds is more than energy release to form bonds
B Energy to break bonds is less than energy release to form bonds
Which type of reaction is represented by B?
Endothermic reaction
Exothermic reaction
Reaction between liquids
Reaction between solids
Answer:
Reaction B is exothermic
Explanation:
From the context of thermodynamics, chemical reactions can be broadly classified as endothermic and exothermic reactions.
Endothermic reactions involve absorption of energy and show a positive value for the reaction enthalpy i.e. ΔH is positive. In contrast, exothermic reactions are accompanied by the release of energy and show a negative value for the enthalpy change i.e. ΔH is negative.
In a given chemical reaction energy is required to break bonds and it is released during the formation of new bonds.
The Reaction B is such that, the energy required to break bonds is less than energy released during formation bonds. Therefore, since there is a net release of energy, the reaction is exothermic.
Exothermic Reactions