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
What is the major ion in seawater? sodium chloride magnesium sulfate
5. How can 100. mL of sodium hydroxide solution with a pH of 13.00 be converted to a sodium hydroxide solution with a pH of 12.00 ? (A) By diluting the solution with distilled water to a total volume of 200 mL (B) By diluting the solution with distilled water to a total volume of 1.00 L (C) By adding 100 mL of 0.10 MHCI (D) By adding 100 mL of 0.10 MNaOH
12. How does the concept of electron transfer explain why sodium and chlorine react to produce sodium chloride?(Hint: Think about the movement of electrons between sodium and chlorine atoms during the reaction.)
2. Use Passage 1 to answer question below. Suppose that in Experiment 2 a solution at a pH of 7.5 had been tested. Based on the results of Experiment 2, the percent recovery of cadmium for that solution would most likely have been: F. between $48\% $ and $80\% $ G. between $80\% $ and $88\% $ H. between $88\% $ and $95\% $ J. between $95\% $ and $100\% $ F G. H. J.
1.Use Passage 1 to answer question below. Based on the description of Experiment 1, when was the graphene separated from the sample liquid by centrifugation? A. Immediately before placing the sample in the water bath B. Immediately after removing the sample from the water bath C. Immediately before the percent recovery of the cadmium was determined D. Immediately after the percent recovery of the cad- mium was determined A B C D
Which statement about asbestos fibers is correct? A. All asbestos fibers are visible without magnification B. Asbestos fibers can be identified by color and texture alone C. Some asbestos fibers are extremely small and require laboratory testing to confirm their presence D. Asbestos fibers are always thicker than a human hair
Which of the following statements describes how water differs greatly from many other substances? It is less dense in its solid form than liquid form. It is a polar covalent molecule. It can change to solid liquid and gas phases. It is comprised of two different elements.
Name the following ionic compounds. Make sure you are in text mode $(''Tt'')$ Do NOT put a space between metal and charge in parentheses if naming a Type II metal ionic compound (i.e. iron(III)) a. $CoCl_{2}$ $\square $
3. How many grams of $Fe_{2}(SO_{4})_{3}$ will be produced from 4.25 moles of Fe? $2Fe+3H_{2}SO_{4}\rightarrow 1Fe_{2}(SO_{4})_{3}+3H_{2}$
Red litmus paper turning blue indicates the prescence of __ ? $Ni(II)$ $Ca(II)$ $Fe(III)$ Ammonium Ion
