Topic
Q:
"somos 10 que damos's
Realiza 3 ejemplos de enloces quimicos tanto
de las familias IA - VIIA como de IIA - VIA
Q:
Carbon atoms have four valence electrons. Oxygen atoms have six valence electrons. Carbon and oxygen can share electrons so that each atom obtains a full outer shell of 8 valence electrons. Draw the shared electrons on this diagram.
Q:
lculate the approximate enthalpy change, \( \Delta H_{\mathrm{rxn}} \), for the combustion of one mole of methane a shown in the balanced chemical equation:
\[ \mathrm{CH}_{4}+2 \mathrm{O}_{2} \rightarrow 2 \mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2} \]
se the values you calculated in Parts \( \mathrm{A}, \mathrm{B}, \mathrm{C} \), and D , Reeping in mind the stoichiometric coefficients.
xpress your answer to three significant figures and include the appropriate units.
Q:
What is 20 mEq equal to in milligrams?
Q:
Zirconium (IV) oxide Multiple Cholce 1 point
Zr2O
\( \mathrm{ZrO}_{2} \)
\( \mathrm{Zr}_{4} \mathrm{O} \)
ZrO
Q:
4. Calcule las concentraciones molares de cada uno de los iones presentes en una solución acuasa de 0.025 M
de nitrato de calcio.
Q:
3. Die Masse eines Wasserstoffatoms beträgt rund
\( 1,66 \cdot 10^{-24} \mathrm{~g} \).
Wie viele Atome sind etwa in 1 g Wasserstoff?
\( \begin{array}{ll}\text { A } 8,34 \cdot 10^{-24} & \text { B } 8,34 \cdot 10^{23} \\ \text { C } 1,66 \cdot 10^{-24} & \text { D } 6,0241 \cdot 10^{23}\end{array} \)
Q:
19. Un volumen de \( 18,3 \mathrm{~mL} \) de disolución de ácido clorhídrico \( 0,100 \mathrm{M} \) se
neutraliza completamente con 50 mL de NaOH. ¿Cuál es la concentración
de NaOH?
A) \( 0,053 \mathrm{M} \)
Q:
\( \mathrm{SO}_{2} \) and \( \mathrm{ClO}_{2} \) are two examples of chemical species that violate the octet rule.
i. Draw the Lewis structure for and \( \mathrm{SO}_{2} \) and \( \mathrm{ClO}_{2} \) state the exceptions to the octet rule for each
molecule.
ii. Draw the dative bond in \( \mathrm{H}_{3} \mathrm{O}^{+} \)
iii. Predict the shape and bond angle in \( \mathrm{SO}_{2} \) molecule by using the VSEPR theory.
iv. Explain whether \( \mathrm{SO}_{2} \) is a polar or non-polar molecule.
Q:
Part A
Particles of this mixture remain inside a semipermeable membrane, but pass through filters.
characteristic of a solution
characteristic of a colloid
characteristic of a suspension
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