30. What chemical bond forms between water molecules? To turn liquid water into

Question

30. What chemical bond forms between water molecules? To turn liquid water into water vapor, what chemical bond needs to be broken? 31. What is the range of pH scale? 32. If a solution's Ht concentration is 10-s M, what is its pH? What is its OH concentration? Is this solution acidic alkaline? 33. A pH of 10 is how many times more basic than a pH of 7?h A) 3 B) 10 C) 102 D) 103 34. Give examples of strong acid, weak acid, strong base, and weak base. 35. What are produced when you mix an acid with a base? 36. What damage can acid rain cause? 37. What is the normal range of human blood pH? 38. Which of the follow ing can function as a buffer to resist pH change? A) HCl C) HCO D) NHs

Explanation / Answer

30.
Two or more water molecules are bonded by hydrogen bonds. When water is heated at the boiling point it changes into vapor by breaking the hydrogen bonds between the water molecules during vaporization.

31. What is the pH range scale?
The pH scale ranges between 1 to 14. 7 indicates neutral pH. Between 1-6 is acidic and between 8-14 is basic.

32. If a solutions H+ concentration is 10^-5 M. What is its pH?
pH = -log(H+) = - log (10^-5)= 5
What is its OH concentration?
H+ + OH- = 14
OH-= 14 -5 =9
The solution is acidic in nature.

33. A pH of 10 is how many times more basic than a pH of 7?
Correct option:
D) 10-3

34. Examples of
strong acids: Hydrochloric acid (HCL), Perchloric acid (HClO4), Sulphuric acid (H2SO4), Nitric acid (HN03)
Weak acids: Acetic acid, Formic acid, benzoic acid, phosphoric acids, nitrous acid.
Strong base: Potassium hydroxide, Sodium hydroxide, Calcium hydroxide, Barium hydroxide.
Weak base: Ammonia, pyridine, ammonium hydroxide, trimethyl ammonia.

35. Addition of acid and base leads to the neutralization reaction producing a salt and water molecules.

36.
Acid rain damages the ecological environment, especially in an aquatic environment. It helps in leaching aluminum from the soil as it flows through leads to higher concentration is lakes ponds and rivers. Plants also suffer leaf burns due to the high acidic contents.

37. The normal range of pH of blood is 7.35 - 7.45

38.
Correct option:
C) H2CO3
Explanation: HCL and NaOH will completely dissociate into the aqueous solution it cannot act as a buffer system. Hence bicarbonate only can act as a buffer among the list of chemical compounds in the options given.

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