What is the mass of 0.089 moles of NaCl? 9.7times 10^-23g 58g 3.5times 10^25g 5.29
A pH of 7 is considered neutral. True False
Colculate the amount of heat needed to melt 79.7 g of solid benzene (C_(6)H_(6)) and bring it to a temperature of 47.4^circ C Round your answer to 3 significant digits. Also, be sure your answer contains a unit symbol. square
The bonding responsible for the structure of ice is: a covalent, ionic, and hydrogen bonding b covalent bonding only c hydrogen bonding only d covalent bonding and hydrogen bonding
Which of the following could be considered a solution? a oxygen gas b air c pure water d all of the above
If you stir a solute into a solvent, __ a more solute will dissolve. b the solution will be more concentrated. c the solute will dissolve more quickly. d two of the above
What is the percent composition by mass of Ca in CaCl_(5)
What is the oxidation number of each oxygen atom in HOOH?
The oxidation number of a phosphorus atom in P_(4) is
What is the mass in grams of 0.852 moles of ferric oxide? (Outcome # 2) (DOK 3)(Paired item 1) 5.34times 10-3g 1368 187 g
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? $H_{2}O+H_{3}O^{+}\leftrightarrow H_{2}O+OH^{-}$ $H_{2}O+H_{2}O\leftrightarrow 2OH^{-}$ $H_{2}O+H_{2}O\leftrightarrow 2H_{3}O^{-}$ $H_{2}O+H_{2}O\leftrightarrow H_{3}O^{+}+OH^{-}$
