1. How many calories are required to increase the temperature of 13.0 g of ethanol from -11.0^circ C to 23.6^circ C ? The specific heat of ethanol is 2.46J/g^circ C 1110 cal 403 cal 264 cal 96.3.9 cal
The ability of an atom to attract the shared electrons in a covalent bond is its __ A) electronegativity B) bonding ability C) polarity D) ionic character E) nonpolarity A B c D E
What is the correct ground state electron configuration of titanium, Ti? A [Ar]3d^2 B 1s^22s^22p^63s^23p^64d^2 C [Ne]3d^2 D 1s^22s^22p^63s^23p^63d^2 E 1s^22s^22p^63s^23p^64s^23d^2
N_(2)(g)+3H_(2)(g)leftharpoons 2NH_(3)(g) A chemist adds 0.0120 moles of N_(2) 0.0250 moles of H_(2) and 0.00375 moles of NH_(3) to a 1.00 L flask. What is the reaction quotient, Q_(C) and what can be stated about the direction in which this reaction is proceeding to reach equilibrium? A Q_(c)=1.33times 10^-2 and the reaction is proceeding forward as written. B Q_(c)=1.33times 10^-2 and the reaction is proceeding from reverse as written. C Q_(c)=75.0 and the reaction is proceeding forward as written. D Q_(c)=75.0 and the reaction is proceeding reverse as written. E Q_(c)=75.0 and the reaction is at equilibrium. K_(c)=2.79times 10^-5
6. underline ( )L=56.0 grams of Ne at STP
Fill in the Blank Question Polar square solvents increase the rate of E2 reactions.
a. Find the pH of a solution that is 0.600 M in formic acid and 0250 M in sodium formate. K_(a)(formic acid)=1.8times 10^-4 pH=3.36 b. Find the pH after 0.150 mol HCl has been added to 1.00 liter of the solution. pH=square
Nickel is electroplated from a NiSO_(4) solution. A constant current of 3.78 amp is applied by an external power supply. How long will it take to deposit 100. g of Ni?The atomic mass of Ni is 58.69. A 1.58 s B 26.5 min C 80.5 s D 24.2h E 12.1h
In a line structure, hydrogen atoms are not shown. the atoms contained in the molecule are each written on a separate line. each atom is represented with a short or long dash. only carbon atoms are shown.
Identify the compound that could be represented by an ionic lattice. nitrogen, N_(2) hydrogen sulfide, H_(2)S titanium sulfide, Ti_(2)S nitric acid, HNO_(3)
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? $H_{2}O+H_{3}O^{+}\leftrightarrow H_{2}O+OH^{-}$ $H_{2}O+H_{2}O\leftrightarrow 2OH^{-}$ $H_{2}O+H_{2}O\leftrightarrow 2H_{3}O^{-}$ $H_{2}O+H_{2}O\leftrightarrow H_{3}O^{+}+OH^{-}$
