Topic
Q:
20. Which compound is covalent?
Q:
\& Qhé volumen de hidrógeno se producirá en condiciones, namales?
\[ \mathrm{Mg}+2 \mathrm{HCl} \rightarrow \mathrm{MgCl}_{2}+\mathrm{H}_{2} \text { - } \]
Q:
¿qué volumen en condictances normales ocupan 0.5 mary de \( H_{3} \) ?
Q:
Calculate the density, in grams per liter, of a gas at STP if 3.04 L of the gas at \( 11.2^{\circ} \mathrm{C} \) and 715.5 mmHg weighs 0.400 g .
Q:
If \( \mathrm{He}(\mathrm{g}) \) has an average kinetic energy of \( 6650 \mathrm{~J} / \mathrm{mol} \) under certain conditions, what is the root mean square speed of \( \mathrm{Cl}_{2}(\mathrm{~g}) \)
molecules under the same conditions?
root mean square speed:
Q:
Estequiometría masa - volumen:
Eumplo No. I:
\[ 3 \mathrm{H}_{2}+\mathrm{N}_{2} \rightarrow 2 \mathrm{NH}_{3} \]
Q:
pH reading of a glass of liquid is given. Find the hydrogen ion concentration of the liquid. (Give your answers in scientific notation, correct to
a) \( \left[\mathrm{H}^{+}\right]= \)
b) Water: \( \mathrm{pH}=6.8 \)
\( \left[\mathrm{H}^{+}\right]=5.1 \)
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Q:
d. A calorimeter has mass 100 g and
specific heat \( 0.1 \mathrm{kcal} / \mathrm{kg}{ }^{\circ} \mathrm{C} \). It
contains 250 gm of liquid at \( 30{ }^{\circ} \mathrm{C} \)
having specific heat of \( 0.4 \mathrm{kcal} / \mathrm{kg} \)
\( { }^{\circ} \mathrm{C} \). If we drop a piece of ice of mass
10 g at 0 . C , What will be the
temperature of the mixture?
Q:
1. A sample of \( \mathrm{CO}_{2}(\mathrm{~s}) \) and a sample of \( \mathrm{CO}_{2} \) (g) differ in
their
A) chemical compositions
B) empirical formulas
C) molecular structures
D) physical properties
2. A mixture of crystals of salt and sugar is added to
water and stirred until all solids have dissolved.
Which statement best describes the resulting mixture?
A) The mixture is homogeneous and can be
separated by filtration.
B) The mixture is homogeneous and cannot be
Separated by filtration.
Depe mixture is heterogeneous and can be
D) The mixture is heterogeneous and cannot be
separated by filtration.
Q:
2. Una solución acuosa de amoníaco \( \mathrm{NH}_{3} 0,25 \mathrm{M} \) tiene un Kb de \( 1,8 \times 10^{-5} \),
presenta disuelta una sal de cloruro de amonio \( \mathrm{NH}_{4} \mathrm{Cl} \) en una concentración de
\( 0,45 \mathrm{M} \).
a. Calcule el pH teniendo en cuenta ambas sustancias disueltas.
b. Calcule el pH suponiendo que solo está presente el amoníaco.
c. Escriba una conclusión teniendo en cuenta los resultados de los incisos a y b.
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