Answer:
The percent error of student is -5 %.
Explanation:
Given data:
measured value = 9.31 m/s²
actual value = 9.8 m/s²
percent error = ?
Formula:
% error = (measured value - actual value / actual value ) × 100
% error = (9.31 m/s² - 9.8 m/s² / 9.8 m/s²) × 100
% error = (-0.49 m/s² / 9.8 m/s²) × 100
% error = -0.05 × 100
% error = -5
Answer:
Ka = 1.5 × 10⁻⁵
Explanation:
Butyric acid is a weak acid that ionizes according to the following equation:
CH₃-CH₂-CH₂-COOH(aq) ⇄ CH₃-CH₂-CH₂-COO⁻(aq) + H⁺(aq)
We can find the value of the acid dissociation constant (Ka) using the following expression:
where
[H⁺] is the molar concentration of H⁺
Ca is the initial molar concentration of the acid
We can find [H⁺] from the pH.
pH = -log [H⁺]
[H⁺] = antilog -pH = antilog -2.71 = 1.95 × 10⁻³ M
Then,
Answer:
2 moles for the first 2 questions and 100g of water
Explanation:
Chemistry voltaic and electrolytic cell help?
Give the sign of the electrodes and the reaction that occurs at each for both voltaic and electrolytic cells. Yes this is homework, but I'm not...
Update:
and what does the question mean by "the sign of the electrodes"?
3 answers · Chemistry
Best Answer
In a voltaic cell (one that happens spontaneously), electrons flow from a negative electrode to a positive electrode (anode ==> cathode). The reaction that happens is a redox reaction where the anode is oxidized (goes from a solid to an ion) and the cathode is reduced (going from an ion to a solid).