1. (XC5pt) Calculate the concentration of each species of X in a 0.551 M solution of Na_(2)X_(41)= 5.59e-2,K_(22)=1.96e-7 [H_(2)X]=underline ( ) [HX^-]=underline ( )[X^2-]=underline ( ) [H_(3)O^+]=underline ( ) [OH-]=underline ( )pH=underline ( )
What is the freezing point of a solution of 0.5 mol of LiBr in 500 mL of water? (K^f=1.86^circ C/m) -7.44C -3.72C -5.58C -1.86C
To which of the following variables is change in boiling point directly proportional? molarity of solution molality of solution percent by volume of solution percent (mass/mass) of solution
What is the molarity of a solution that contains 6 moles of solute in 2 liters of solution? 7M 6M 3M 12M
Which of the following usually makes a substance dissolve faster in a solvent? increasing the particle size of the solute agitating the solution decreasing the number of particles lowering the temperature
Based on its location on the periodic table , which metal is likely to be less reactive than rubidium and more reactive than calcium? potassium (K) cesium (Cs) magnesium (Mg) titanium (Ti)
How many neutrons do carbon -12 and carbon -13 have, respectively? A 6;7 B 12;13 C 7;6 D 13,11
Multiple Choice 1 point How many moles of NO are formed if 2.50 moles of N_(2)O_(4) completely react using the balanced equation below? N_(2)H_(4)+2N_(2)O_(4)arrow 6NO+2H_(2)O 15.0 moles 10.0 moles 5.00 moles 7.50 moles
24. How is the empirical formula different from the molecular formula?
Seawater has a density of 1.03g/mL What mass of seawater would fill a vessel with a volume 0.225 liters? 218 grams 232 grams 246 grams 225 grams 458 grams
Given the following reactions and corresponding $\Delta H$ values, find the $\Delta H$ (to the nearest whole \#) for the reaction: $H_{2}SO_{4}(l)\rightarrow SO_{3}(g)+H_{2}O(g)$ $H_{2}S(g)+2O_{2}(g)\rightarrow H_{2}SO_{4}(l)$ $\Delta H=-235kJ$ $H_{2}S(g)+2O_{2}(g)\rightarrow SO_{3}(g)+H_{2}O(l)$ $\Delta H=-207kJ$ $H_{2}O(l)\rightarrow H_{2}O(g)$ $\Delta H=44kJ$ $\square $
Convert $4.68\times 10^{25}$ atoms $PBr_{3}$ to mol
Which of the following best describes a mixture? a material that is made up of many molecules a substance that can be changed into another substance a material that contains two or more substances a substance that has been broken down into Its smallest parts
What is used to of a hope of sixes in a a compound heard on the chermal reme? the periodic table prefixes chemical symbols the IUP AC
40. Using the hyphen form of symbol writing write the name of this atom. ${}_{9}^{19}F^{-1}$
Which of the following will not increase 1 point the rate of a chemical reaction? increasing surface area stirring decreasing the temperature increasing the concentration A __ is a substance that increases the rate of a reaction without being consumed. __ 1 point A(n) __ slows down the rate of a reaction. __ is a substance that 1 point
Use molecular orbital theory to determine the bond order in $H_{2}$ o 2 1 3
What partie should be used for the caygin akan when maning the characal formuls $SO_{2}?$ $\square $ disappointed mono- pent.
What happens to the pH of a buffer solution if it is diluted by adding more water? A) pH increases B) pH decreases C) pH remains the same D) pH becomes 7 E) It depends on the starting volume of the buffer
What is the chemical formula for lead (II)sulfate? $Pb_{3}(SO_{4})_{2}$ $PbSO_{4}$ $Pb_{3}(SO_{3})_{2}$ $PbSO_{3}$
