Tema
Q:
What is a redox reaction?
A. A reaction in which an element in one molecule is traded for an
element in another
B. A reaction in which the oxidation state of one element increases
and another decreases
ceactant and product
D. A reaction in which an element changes phases when going from
reactant to product
Q:
Which of the following is an example of a chemical change?
\( \begin{array}{l}\text { A. A mixture forming } \\ \text { B. A liquid evaporating } \\ \text { C. A solid dissolving } \\ \text { D. A precipitate forming }\end{array} \)
Q:
What information does an empirical formula give?
A. The ratio of the atoms in a molecule as found in nature
B. The lowest whole-number ratio of atoms in a molecule
C. The order in which atoms are bonded in a molecule
D. The percent composition of atoms in a molecule
Q:
How are elements arranged on the periodic table?
A. By increasing atomic radii
B. By increasing electronegativity
C. By increasing atomic mass
D. By increasing atomic number
Q:
Which of the following is the correct electron configuration for N (nitrogen)?
A. \( 1 s^{2} 2 s^{2} 2 p^{3} \)
B. \( 1 s^{2} 2 s^{2} 3 s^{2} 3 p^{1} \)
C. \( 1 s^{2} 1 p^{5} \)
D. \( 1 s^{2} 2 s^{2} 2 p^{2} 3 s^{1} \)
Q:
What property characterizes a spontaneous redox reaction?
A. A positive oxidation potential for the oxidation half-reaction
B. A positive reduction potential for the reduction half-reaction
C. A negative sum of the two half-reactions' standard potentials
D. A positive sum of the two half-reactions' standard potentials
Q:
Which property has a trend similar to that of electronegativity?
A. First ionization energy
B. Atomic mass
C. Atomic radius
D. Ionic radius
Q:
What does the VSEPR theory tell about a molecule?
A. The reactions it can have
B. The geometry it will have
C. The bond energies it has
D. The atoms it contains
Q:
HCIO2 \( +\mathrm{Ca}(\mathrm{OH}) 2 \rightarrow \mathrm{Ca}(\mathrm{CI} \) O2)2 + H2O
SE HACE REACCIONAR 50 GR DE ACIDO CARBONICO Y 120 GR DE OXIDO DE
POTASIO
a. ¿CUAL ES LA SUSTANCIA QUE REACCIONA COMPLETAMENTE?
b. ¿CUANTO DE LA OTRA QUEDA SIN REACCIONAR?
c. ¿CUANTOS GRAMOS DE CARBONATO DE POTASIO SE OBTIENE?
Q:
3. SE DESEA OBTENER 100 GR DE CLORITO DE CALCIO. CALCULAR:
a-LA MASA DE ACIDO CLOROSO QUE SE NECESITA
b-EL NUMERO DE MOLES DE MOLECULAS DEL HIDROXIDO DE CALCIO QUE DEE
MPLEARSE.
HCIO2 + \( \mathrm{Ca}(\mathrm{OH}) 2 \rightarrow \mathrm{Ca}(\mathbf{C l} \mathbf{O 2}) 2+\mathrm{H} 2 \mathrm{O} \)
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