Question

U) Indicate if each statement below is true or false (on statement below is true or false (one error allowed) (4.5 points na 30.97g of phosphorous there are 6.022x10 atoms of phosphorous b) Solubility of gases in Solubility of gases in water increase as the solution temperature increases woments in group 2A show a tendency to lose 2 electrons and become positively charged-2 d) Oxygen is more electronegative than sulfur e) When dissolving 9.0 g NaCl within one liter of water the solution is 0.9% An acid solution with a concentration of (H+) - 1.0 x 10 moleiter shows a pH=3 9) A non-electrolyte solution is capable of conducting electricity h) An alcoholic solution of 4.3% by volume is made by mixing 45 ml alcohol with 10 liter of water h) in a saturated solution, some solute crystals remain on the bottom after mixing D) During an exothermic reaction, heat is produced

Answer 1

Solution 8.

a) TRUE

Atomic mass of Phophorus = 30.97 g/mole

Now, As we know from the Avogadro Number concept that 1 mole contains 6.022 X 10²³ elementary entities

so,

30.97 g of phosphorus ( or 1 mole of Phosphorus) contains 6.022 X 10²³ atoms.

b) FALSE

The solubility of gas decreases as temperature increases.

As we know that when temperature increases, kinetic energy also increases. This increased kinetic energy leads to more motion in gases which causes the breaking of intermolecular bonds and hence gases escape the solution.

c) TRUE

The elements of group 2A (like Magnesium, Calcium) have two electrons in their outermost orbit. The elements of group 2A are electropositive in nature and they show a tendency to lose these two valence electrons and gain two positive charges.

d) TRUE

Oxygen is more electronegative than sulfur because oxygen has a smaller atomic radius and hence the bonding electrons are closer to the nucleus which exerts a higher pull. Bonding electrons in sulfur are further away and there is double layer of sheilding (as compared to oxygen which has one layer only).