10. What is the molality of a solid solution containing 0.125 g of chromium and 81.3g of iron?

Which of the following substances is formed when fossil fuels are burned? Sulfur dioxide Carbon tetrachloride Nitrogen Oxygen

What is the subscript for the oxygen? 3 6 .1 2

Which element is the main component of steel? iron nickel cobalt

Which of the following elements is more electronegative than C? Choose 1 answer: A N B Na C Al D Si

How many electrons are in the outermost shell of an atom of phosphorus (P) Use the periodic table. 3 5 15 30.974

Suppose a 250. mL flask is filled with 1.4 mol of NO_(3) and 0.60 mol of NO_(2) The following reaction becomes possible: NO_(3)(g)+NO(g)leftharpoons 2NO_(2)(g) The equilibrium constant K for this reaction is 2.27 at the temperature of the flask. Calculate the equilibrium molarity of NO_(2) Round your answer to two decimal places.

Suppose a 250. mL flask is filled with 1.4 mol of NO_(3) and 0.60 mol of NO_(2) The following reaction becomes possible: NO_(3)(g)+NO(g)leftharpoons 2NO_(2)(g) The equilibrium constant K for this reaction is 2.27 at the temperature of the flask. Calculate the equilibrium molarity of NO_(2) Round your answer to two decimal places.

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

Hot Questions

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? $H_{2}O+H_{3}O^{+}\leftrightarrow H_{2}O+OH^{-}$ $H_{2}O+H_{2}O\leftrightarrow 2OH^{-}$ $H_{2}O+H_{2}O\leftrightarrow 2H_{3}O^{-}$ $H_{2}O+H_{2}O\leftrightarrow H_{3}O^{+}+OH^{-}$