H2SO3 (aq) + H2O(l) ⇌ H3O +(aq)+HSO3 −(aq) Ka = 1.2 × 10−2M HS−(aq) + H2O(l) ⇌ H3O +(aq)+S 2−(aq) Ka = 1.3 × 10−19M (i) Identify the stronger acid. (2 marks) (ii) What is the conjugate base of 23? (1 mark) (iii) Which acid has weak conjugate base? (2 marks) (iv) Which acid has stronger conjugate base? (2 marks) (v) Which acid produces more ions?
Answers
Explanation:
If you see a cavity or feel a sharp pain while eating an ice cream, visit a
dentist immediately.
Note:
Friday, the 22nd
May 2020.
1. Do exercise – A and multiple choice questions of pages 23, 24 in the book.
2. Do exercise – B Q. No. 1,2,3,5,6 given on page 25 in the note book.
Saturday, the 23rd May 2020.
Extra questions to be done in the notebook:
Q1. Give one word:
a. This type of teeth help us to bite our food._____________
b. You should avoid eating these to save your teeth._____________
c. It helps to keep our teeth strong as it is rich in calcium._____________
d. The dentist puts it to make teeth grow straight.___________________
e. We should use it to clean our tongue.___________________________
Q2. Tick the correct answer.
a. A person who treats us when we have a toothache.
i. physician ( ) ii. dentist ( ) iii. orthopaedic ( )
b. These are called tearing teeth.
i. incisors ( ) ii. molars ( ) iii. canines ( )
c. It causes cavities in dirty teeth.
i. oxygen ( ) ii. bacteria ( ) iii. brushing ( )
Q3. Study the diagram of the structure of a tooth given on page number 21 and
answer the questions that follow. ( Do not draw the diagram)
a. Name the soft and the hardest part of a tooth.
Answer:
A Bronsted-Lowry acid is a proton (H+ ) donor