14. As a solution containing 158 g dm of Nas, dm
B was obtained by dissolving 9.0 g of an impure sample of lain aqueous KI and the solution made up to
Put A into the burete. Pipette 25.0 cm of B. Use starch solution as indicator Repeat the titration to obtain
concordant titre values
Complete the table and calculate the average volume of Aused
Buretle readings/em!
1
2
Final reading
14.30
28.50
6.55
Initial reading
0.00
Volume of A used/em!
14.00
14.10
The equation for the reaction involved in the titration is:
T25.01.21 S. O.
From your results and information provided, calculate the:
a) Concentration of A in moldm?
b) Concentration of 12 in B in moldm':
c) Percentage by mass of I2 in the sample.
10-16.0. Na - 23.0, S - 32.0.1 - 127.01
110

7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation. 8. when a 2.5 mol of sugar (c12h22o11) are added to a certain amount of water the boiling point is raised by 1 celsius degree. if 2.5 mol of aluminum nitrate is added to the same amount of water, by how much will the boiling point be changed? show all calculations leading to your answer or use 3 – 4 sentences to explain your answer. 9. if 5.40 kcal of heat is added to 1.00 kg of water at 100⁰c, how much steam at 100⁰c is produced? show all calculations leading to an answer. 10. the freezing of water at 0⁰c can be represented as follows: h2o (l) ↔ h2o(s) the density of liquid water is 1.00 g/cm3. the density of ice is 0.92 g/cm3. in 3 – 4 sentences explain why applying pressure causes ice to melt.

Identify one disadvantage to each of the following models of electron configuration: -dot structures -arrow and line diagrams -written electron configurations type in your answer below. (answer) -dot structures do not show the distribution of electrons in orbitals and take up a lot of space. -arrow and line diagrams take up a lot of space and make it difficult to count electrons. -written configurations make it easy to lose count of electrons and do not show the distribution of electrons in orbitals.

Suppose you wanted to make 100 grams of water. what is the molar mass of water (h2o)?