Which is true about reaction rates? High reaction rates occur only in spontaneous reactions. Low reaction rates occur only in nonspontaneous reactions. Reaction rates are not dependent on high or low activation energies. Reaction rates are not related to spontaneity.
An atomic anion with a charge of -3 has the following electron configuration: [Ar]4s^23d^104p^6 What is the chemical symbol for the ion? How many electrons does the ion have? How many 3d electrons are in the ion? square square square
Which of the following is a characteristic of hot reactors? Multiple Choice They have active and healthy lifestyles. They usually lead a relaxed lifestyle. They rarely get angry. They tend to suffer from high blood pressure.
Calculate the percent ionic character for the gaseous sodium chloride, NaCl, molecule. The measured dipole moment, mu _(measured) for sodium chloride is 9.00 D and the Na-Cl bond length is 236 pm. 1D=3.34times 10^-30Ccdot m 79.6% 126% 11.3% 0.796%
Which element cannot be a central element in a compound? oxygen sulfur carbon hydrogen
A compound accepts electrons from another substance to form a covalent bond. Which term best describes this compound's behavior? Lewis acid Arrhenius base Bronsted-Lowry acid Bronsted-Lowry base
An increase in temperature __ the rate of a reaction. a. decreases b. increases
What is the name of the compound with a formula CH_(3)CH_(2)CH_(3) ethane propane methane butane
[13] Calculate the standard enthalpy of formation of gaseous diborane (B2H6) using the following thermochemical information: 4B(s)+3O_(2)(g)arrow 2B_(2)O_(3)(s) Delta H^circ =-2509.1kJ 2H_(2)(g)+O_(2)(g)arrow 2H_(2)O(l) Delta H^circ =-571.7kJ B_(2)H_(6)(g)+3O_(2)(g)arrow B_(2)O_(3)(s)+3H_(2)O(l) Delta H^circ =-2147.5kJ
What is the [H^+] of 1.32M HF with 0.08M HBr?
How many protons are in an atom of carbon with 7 neutrons? a) 6 b) 7 c) 12.01 d) 13 e) None of the above
How many electrons are in the element potassium with 20 neutrons? a) 19 b) 20 c) 39 d) 39.10 e) None of the above
An erlenmeyer flask has a calibration of 50 mL. To what value can you estimate a measured volume? the nearest 0.01 mL the nearest 1 mL the nearest 0.1 mL the nearest 10 mL
2. Can you determine conclusively that an unknown substance contains only magnetite by using only a magnet? Explain your answer. __
Before you go, which type of molecule would you choose to be the anode in a lithium battery? a) The metal with the most negative potential b) It does not matter since lithium's potential is so negative c) The metal with the most positive potential d) Another lithium compound
$2Fe_{2}O_{3}(s)+3C(s)\rightarrow 4Fe(s)+3CO_{2}(g)$ Calculate the mass of iron produced from the complete reaction of 64.0 grams of iron (III)oxide. 89.5 g Fe 22.48 Fe 11.2 g Fe 44.88 Fe 107 g Fe
QUESTION Q Which of the following is true concerning mass number? ANSWER Using mass number notation, we can identify the number of protons. electrons.and neutrons. Isotopes differ in their numbers of electrons. The mass number is equal to the number of protons. Thus, the mass number of Helium is 2. The mass of electrons contributes significantly to mass number. IDONT KNOWYET
Multiple Choice Question If phenol red is added to a solution with a pH of 9.0, it will appear __ pink-red yellow
What precipitate forms when mixing silver(I)nitrate and sodium chloride? silver(I) chloride sodium nitrate no precipitate forms
Which of these equations correctly expresses the self-ionization of water? $H_{2}O+H_{3}O^{+}\leftrightarrow H_{2}O+OH^{-}$ $H_{2}O+H_{2}O\leftrightarrow 2OH^{-}$ $H_{2}O+H_{2}O\leftrightarrow 2H_{3}O^{-}$ $H_{2}O+H_{2}O\leftrightarrow H_{3}O^{+}+OH^{-}$
