Tema
Q:
4) Las concentraciones de iones de hidrógeno en los quesos van desde \( 4 \times 10^{-7} \mathrm{M} \) hasta
\( 1,6 \times 10^{-5} \mathrm{M} \). Determinar el rango correspondiente en las lecturas del pH.
Q:
A 9 L cylinder of hydrogen contains gas molecules under 9.12 atm and 284 K . How many moles of hydrogen does the cylinder
contain?
Q:
weather balloon filled with helium gas has a volume of 23 L at 1.03 atm . What is the volume of the balloon after its pressure drops
0.77 atm during its ascent?
Add your answer
Q:
h) Si en una neutralización hace reaccionar 35 mL de \( \mathrm{HClO}_{4} \) con \( 28,3 \mathrm{~mL} \) de \( \mathrm{KOH} 0,20 \mathrm{M} \), ¿Cuál es
la concentración del \( \mathrm{HClO}_{4} \)
Puntaje: 0,3 fórmula, 0,3 reemplazo, 0,4 resultado si no coloca la unidad ( \( -0,2 \) )
(1,0 puntos)
Q:
15) From the amphoteric hydroxides that can dissolve in strong acids
alkali
a) Iron Il hydroxide
b) aluminum hydroxide
c) Iron Ili hydroxide
d) all of the previous
Q:
2.2 A 9.780 g gaseous mixture contains ethane \( \left(\mathrm{C}_{2} \mathrm{H}_{6}\right) \) and propane \( \left(\mathrm{C}_{3} \mathrm{H}_{8}\right) \). Complete combustion
of the mixture requires 1.120 moles of oxygen gas to form carbon dioxide and water.
2.2 .1 Write balanced equations for the two reactions.
2.20 (2)
Calculate the mass of ethane in the mixture.
Q:
Question \( 5 \quad \) [26 marks]
\( \begin{array}{l}\text { Substance } A \text { has a molecular formula of } \mathrm{C}_{5} \mathrm{H}_{10} \mathrm{O}_{2} \text {. Substance } \mathrm{A} \text { has the smell of apples. It is a } \\ \text { product of the reaction between butanoic acid and an alcohol } B \text {. } \\ \text { Answer the following questions based on the above statement: } \\ \text { 5.1.1 What family of organic compounds does substance } A \text { belong to? } \\ \text { 5.1.2 Draw the expanded structure of compound } A \text {. }\end{array} \) (1)
Q:
The water dissolves some of the chemicals
in the tea leaves when you are using a tea
bag to make tea.
Q:
4.4 Boric acid, \( \mathrm{B}(\mathrm{OH})_{3} \), a weak acid is used as a mild antiseptic. It ionizes in water as follows:
\[ \mathrm{B}(\mathrm{OH})_{3}(\mathrm{aq})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightleftharpoons \mathrm{B}(\mathrm{OH})_{4}^{-}(\mathrm{aq})+\mathrm{H}_{3} \mathrm{O}^{+}(\mathrm{aq}) \]
4.4.1 Calculate the hydronium ion concentration of a 0.015 M aqueous solution of boric acid, given
that the equilibrium constant for this reaction is \( 5.9 \times 10^{-10} \).
Q:
Question \( 4 \quad[20 \) marks \( ] \)
\( 4.1 \quad \) Write an equation in which \( \mathrm{H}_{2} \mathrm{PO}_{3}^{-} \)acts as an acid and another in which it acts as a base. (2)
4.2 A shampoo solution at \( 25^{\circ} \mathrm{C} \) has a hydroxide ion concentration of \( 1.5 \times 10^{-9} \mathrm{M} \).
4.2 .1 Calculate its hydronium ion concentration.
4.2 .2 Is this solution acidic, neutral, or basic? Give a reason for your answer.
4.3 A 1.00 L aqueous solution contained 5.80 g of sodium hydroxide, \( \mathrm{NaOH} . \mathrm{Calculate} \) the pH of
this solution at \( 25^{\circ} \mathrm{C} \) ?
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