Question

8) indicate if each statement below is true or false (one emror allowed) (4.5 points) a) In a 30.97g of phosphorous there are 6.022x10 atoms of phosphorous b) Solubility of gases in water increase as the solution temperature increases c) Elements in group 2A show a tendency to lose 2 electrons and become positively charged -2 d) Oxygen is more electronegative than sufur e) When dissolving 9.0 a NaCI within one liter of water the solution is 0.9% ) An acid solution with a concentration of TH+1 1.0x 10 moleiter shows a pH3 g) A non-electrolyte solution is capable of conducting electricity h) An alcoholic solution of 4.3 % by volume is made by miding 45 ml alcohol with 1.0 liter of water h) In a saturated solution, some solute crystals remain on the bottom after miing D During an exothermic reaction, heat is produced 9) Show the correct link according to description on the right (one error allowed): (2.5 points) Small molecules and ions pass through a semi-permeable membrane while large macromolecules are held back a) Hypotonic Heterogeneous mbdture with very large and heavy particles that tend to settle down on the bottom of the container. b) Isotonic Solution has the same solute concentration as the concentration inside the blood cells c) Suspension Solution has a lower solute concentration as the concentration inside the blood cells d) Osmosis A homogeneous micture made up of very small size molecules or ions. e) Dialysis Passage of water molecules through a semi-permeable membrane from a solution containing a lower salt concentration to a solution containing a higher salt concentration f Solution

Answer 1

Question is based on simple concepts of chemistry.

2117 solution (0) Atomic mass of phosphorus z 30.97 gram Нии 3-91 Ачам флозрачив Coudaiмд 6:023x16 Задоци. Hence statement is toue · 16 when the temperature increases the kinetic energy also incuases due to which there is more mation in gas molecules due to which break the affraction betersen malecules and solution and escape from solution. Hence as the temperature increases the solubility of gases in water decreased' 0 0 Hence the given statement is wrong. The elements (cuetals) which are in group 2A have two electrons in their valenca shells. Hence for stablication there is removing of electron due to which there is t2 oxidation statea Hence the given statement is true - On going top to bottom in periodic table the size increases. Hence oxyged is smaller in size than sulfur and in valence shell of electrons placed more closely than sulphur. Hence the given statement is true

We know that ti X 100 z mask of selecte voltat o 8 aludtom S leme) (wy z go gramm x 100_. 1 litru go gram Losome we 70-9 gram z 0.99% (m) to 20.94. Hence the given statement is foul. - 1 [H] & 10x10's PH za log[41] = -log (rox 10) 2-dog -log(109) z o +3 z3 Hence given statement is true! complete Electrolytes are salto al malecules which on a lonization give 8 ions and due to these long they can conduct electricity but nou- electrolyte not dissociate tuto ions in salution . Hence it can not conduct electricity. Hence given statement is wrong.

We know that Volun/valent valune of solute (one) x too préventage values of selection (el). Miy z 45 4 x100 45 + Lour 2 45 1045 x 100 74.12 X10 x 24.12X103./. Hence given statement is wrong. A satarated solution is solution which contains the maximum ma88 of dissolved solute in a given volume of solvent at a particular temperature, and it may or may not contains undissolved salute t Hence the given statement is true Yes dwing an exothermie owaction cheat is produced.