revision from ( 1-1 ) to (1-7)

Which of the following salts dissolves in water and produces an acidic solution?

• Sodium chloride

• ammonium chloride

• Sodium bicarbonate

• ammonium acetate

Which of the following salts, when dissolved in water, produces a basic solution?

• Sodium chloride

• ammonium chloride

• Sodium bicarbonate

• ammonium acetate

The polarity of the water molecule is due to:

• The number of atoms that make up a water molecule is only three atoms.

• The electronegativity of hydrogen is greater than the electronegativity of oxygen

• The electronegativity of oxygen is greater than the electronegativity of hydrogen

• The electronegativity of hydrogen is equal to the electronegativity of oxygen.

When comparing the boiling point of water with the boiling point of a compound similar in composition, such as hydrogen sulfide, we notice:

• The boiling point of water is high, due to the presence of hydrogen bonds between its molecules.

• The boiling point of water decreases due to the presence of hydrogen bonds between its molecules.

• The boiling point of hydrogen sulfide is high, due to the presence of hydrogen bonds between its molecules.

• The boiling point of hydrogen sulfide is low, due to the presence of hydrogen bonds between its molecules.

All of the following are consequences of the polarity of the water molecule except:

• Water molecules are linked together by hydrogen bonds.

• The ability to dissolve many mineral salts.

• The boiling point of water rises to 100.

• The ability to dissolve a non-polar organic compound.

continuous change between the three states of water on the Earth’s surface within a closed system called the cycle.

• Nitrogenous

• carbonaceous

• Oxygenation

• Hydrology

What is the approximate value of the angle between the covalent bonds in a water molecule?

• 90

• 104.5

• 120

• 180

Oxygen represents ..................... of the mass of the water molecule

• 88.89%

• 11.11%.

• 22.11%.

• 99.89%

The volume of water becomes minimum at .................

• 6 °C

• 4 °C

• 2 °C

• 0 °C

The density of water becomes maximum at .................

• 6 °C

• 4 °C

• 2 °C

• 0 °C