Deduce the change in ox. no. for the bold atoms or ions in each of the following equations. In each case, state whether oxidation or reduction has taken place. a i 21+Br, → I, + 2Br ii (NH),Cr,O, →N, + 4H,O + Cr,O, iii As,O, + 21, + 2H,O → As,O, + 4H* + 41- b Identify the oxidising agent and the reducing. agent in parts a i and a iii. 3. 5.

A chemist wants to make 5.0 LL of a 0.330 MCaCl2MCaCl2 solution. What mass of CaCl2CaCl2 (in gg) should the chemist use?         Express your answer in grams using two significant figures.

What is the pH of (3.21x10^-1) M C5H5NHBR? Enter your answer in scientific notation with 3 sig figs. Do not include any units in your answer. Do not round any intermediate calculations. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: х10 Answer

The percent concentration of a solution is a ratio of the amounts of dissolved solute and solution, expressed as a percentage. The percent concentration of a solution can be written generally as % concentration = amount of solute x 100% amount of solution Depending on the situation, a percent concentration might be calculated for mass/mass, volume/volume, or mass/volume. tab os lock ntrol esc alt option Q A Z 5,566 2 W S AUG 2 F2 X H command 3 20 E F3 D $ 4 C 888 R Part A F4 70 Calculate the mass percent of a solution that is prepared by adding 54.8 g of NaOH to 461 g of H₂O. Express your answer numerically. ► View Available Hint(s) LIVE ΑΣΦΑ++ ο Submit Part B F [ΫΠ| ΑΣΦ Calculate the mass/volume percent of a NaCl solution in which 136 g of NaCl is dissolved in enough water to give a total volume of 1.44 L . Express your answer numerically. View Available Hint(s) % 5 V T G - 0 B MacBook Air F6 Y & - V 8⁰ 7 H #tv NA ? F7 ? U N %(m/m) %(m/v) 00* J FB M ( 9 K L F10 P command Review I Cons…

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Which of the following is true about finding the molar mass of potassium sulfate, K₂SO4? A. The molar mass is found by adding the molar mass of potassium (K) to the molar mass of sulfate (SO4). B. The molar mass is found by using Avogadro's number divided by 22.4. C. The molar mass is found by taking 2x the molar mass of potassium (K) plus 1x the molar mass of sulfur (S) plus 4x the molar mass of oxygen (O). D. The molar mass of potassium sulfate is a number between 1 and 10.

Part B A student placed 12.5 g of glucose (C¢H12O6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100. mL mark on the neck of the flask was reached. The flask was then shaken until the solution was uniform. Á 45.0 mL sample of this glucose solution was diluted to 0.500 L. How many grams of glucose are in 100. mL of the final solution? Express your answer to three significant figures and include the appropriate units. • View Available Hint(s) Value Units Submit

OH Z ZI 1. PCC 2. H+ NH, B ZI ZI ?

OH Z ZI 1. PCC 2. H+ NH, B ZI ZI ?

So are there 2 products or 4?