QUIZ 2: MEASUREMENT TO REACTION DYNAMICS

A 90.00 mL solution of NaCl and ethyl alcohol has 7.83 g of salt dissolved in the alcohol. Calculate the molar concentration of the solution.

1.49 M

The maximum number of electrons in a single d-subshell is:

10

The element has how many neutrons?

146

The electron configuration of Ne is:

1s22s22p6

The first four ionization energies for an imaginary element, Xz, are E1 = 102 kcal, E2 = 186 kcal, E3 = 4021 kcal, and E4 = 4862 kcal. The most probable number of valence electrons as indicated by this ionization data is:

2

Balance the following reaction. If a coefficient of "1" is required, use "blank" in the box. CH3OH + O2 → CO2 + H2O

2 3 2 4

The combustion of 14 grams of CO according to the reaction CO(g) + ½O2(g) → CO2(g) + 67.6 kcal gives off how much heat?

34 kcal

The element Ag has how many protons?

47

Carbon-14 has an atomic number of 6. Carbon has how many electrons?

6

The maximum number of electrons in a p-sublevel is:

6

The number of valence electrons for 1s22s22p4 is:

6

The curves represent two possible reaction paths for the decomposition of ammonia, NH3. One can correctly conclude from the graph that the best explanation for the difference between (I) and (II) is that:

A catalyst was added.

Reaction rates are affected by concentration, collision geometry, and the presence of a catalyst. Which of the following statements is FALSE concerning these factors?

A reaction occurs each time particles of the reactants collide.

Select all that apply. In the vertical columns of the periodic table:

Atomic weight increases from top to bottom. The number of shells increases from top to bottom.

Based upon location in the periodic table, the formula for beryllium (Be) chloride (Cl) is:

BeCl2

Ionization energy and electronegativity are related to the periodic table in that:

Both increase going across a period and up a family.

Select all that apply. Which two of the following equations represent an exothermic reaction?

C(graphite) → C(diamond), ΔH = -0.45 kcal/mole C CH4 + 2O2 → CO2 + 2H2O + 212,800 cal

Which of the following apply to solution concentration? Select all that apply.

Moles of solute = (Liters of solution) x (Molarity of solution) (Initial Concentration)(Initial Volume) = (Final Concentration) (Final Volume) Boiling points and freezing points of solutions change as the concentration of the solute changes

The following list contains some common polyatomic ions. Using the charge on these ions and the idea of valence, predict the formulas for the following. nitrate NO3 - phosphate PO4³- sulfate SO4²- acetate C2H3O2 - ammonium NH4 4 chromate CrO4²- carbonate CO3²- dichromate Cr2O7²- permanganate MnO4 - sulfide S²- sodium carbonate potassium permanganate

Na₂CO₃ KMnO₄

When atoms from Group IA combine with atoms from Group VII:

The bond will be ionic.

Select all that apply. What factor(s) may be responsible for the ionization energy within a period?

The diameter of the atom decreases somewhat as electrons are added. The attractive force of the nucleus increases.

Consider the two electron arrangements for neutral atoms A and B. What is the difference between atom A and atom B? A - 1s22s22p63s1 B - 1s22s22p65s1

The outer electron of atom B has moved to a higher energy state.

Select all that apply. When the products of a reaction have more energy than the reactants:

The reaction is endothermic. The change in enthalpy is positive.

Select all that apply. Which statements concerning this diagram are correct?

X = ΔH

Which of the following changes would decrease the rate of a reaction?

adding more heat to an exothermic reaction

Ammonium hydroxide ionizes as follows: NH4OH NH4 + + OH-. If an excess of ammonium salt, such as NH4Cl (which ionizes to give NH4 + ions), is added to the equilibrium shown above, you could predict that the result will be to

decrease the concentration of OH-

The reaction, Z + Q → X + Y is:

exothermic

A _____ emission results in the release of energy without any apparent change in mass or nuclear charge

gamma ray

The time necessary for the decay of one-half of sample of a radioactive substance is a _____.

half life

Consider the equation: 2NO2(g) N2O4(g). Using ONLY the information given by the equation, which of the following changes would increase the molar concentration at equilibrium of the product N2O4(g)?

increase the pressure

Select all that apply. A nonmetal:

is more likely to attract an electron than a metal requires more energy to lose an electron than a metal

Select all that apply. The last element in any period always has:

its outer energy level completed the properties of an inert gas

1s22s22p3 is the correct orbital configuration for _____.

nitrogen

Isotopes:

of a given element have different numbers of neutrons

The bond between F and Cl would be:

polar covalent

The equilibrium of 2H2O(g) 2H2(g) + O2(g) at 2,000 K has a Keq value of 5.31 x 10-10. What is the mass action expression for this system?

second choice

A covalent bond is formed by the following process:

sharing two electrons between two atoms

Which of the following is evidence of a chemical change?

the formation of a gas

Periodicity is best defined as:

the repeating nature of physical and chemical properties with atomic number

When do electrons emit energy?

when moving to a lower orbit from an excited state