Topic
Q:
A student places 0.88 mol of NaCl in a beaker and adds enough water to form 1.55 L of solution. What is the molarity of the
solution?
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Q:
A 2.65 g sample of potassium nitrate is dissolved in 114 g of water. What is the percent mass by mass for the resulting solution?
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Q:
A sample of magnesium sulfate is placed in a beaker. Water is added and the mixture is stirred, creating a solution. Which
substance is the solute, and which is the solvent?
A) Magnesium sulfate is the solute; water is the solvent.
B Magnesium sulfate is the solvent; water is the solute.
(C) Both magnesium sulfate and water are solutes.
(D) Both magnesium sulfate and water are solvents.
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?
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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)
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