Download App

Science [4 Mark Questions]

CHEMISTRY CH11 Atomic Structure · Tamil Nadu Board STD 9 (Tamil - English Medium). 5 questions.

Questions

[4 Mark Questions]

🎯

Test yourself on this topic

5 questions · timed · auto-graded

Question 14 Marks
Complete the following table.
Atomic Number Mass Number Number of Neutrons Number of Protons Number of Electrons Name of the Element
9 ______ 10 ______ ______ ______
16 ______ 16 ______ ______ ______
______ 24  ______ ______ 12 Magnesium
______ 2 ______ 1 ______  ______
______ 1 0 1 1 ______
Answer
Atomic Number Mass Number Number of Neutrons Number of Protons Number of Electrons Name of the Element
9 19 10 9 9 Potassium
16 32 16 16 16 Sulphur
12 24  12 12 12 Magnesium
1 2 1 1 1  Deuterium
1 1 0 1 1 Hydrogen
View full question & answer→
Question 24 Marks
State the Gay Lussac’s law of combining volumes. Explain with an illustration.
Answer
Whenever gases react together, the volumes of the reacting gases and the products bear a simple whole number ratio, provided all the volumes are measured under similar conditions of temperature and pressure.
Steps:

  1. Hydrogen combines with oxygen to form water 
  2. $H _2+\frac{1}{2} O _2 \rightarrow H _2 O$ (Skeletal eqution)
  3. $2 H _2+ O _{2( g )} \rightarrow 2 H _2 O _{2( g )}$ (Balanced equation)

(2 volumes) + (1 volumes) ( 2volumes)

2:1:2

Two volumes of hydrogen react with one volume of oxygen to form two volumes of water vapour that is the ratio by volume, which gases bears is
2:1:2, which is a simple whole number ratio.

View full question & answer→
Question 34 Marks
What conclusions were made from the observations of Gold foil experiment?
Answer
In Rutherford’s Alpha ray scattering experiment, the following conclusions were made from the observations.
  • Atom has a very small nucleus at the centre.
  • There is a large empty space around the nucleus.
  • The entire mass of an atom is concentrated in a very small positively charged region, which is called Nucleus.
  • The electrons are distributed in the vacant space around the nucleus.
  • The electrons move in circular paths around the nucleus.
View full question & answer→
Question 44 Marks
SymbolAtomic No.Electronic Configuration
1) He2?
2) Ne?2,8
3) Ar?2, 8,8
4) Na11?
Answer
1) 2
2) 10
3) 18
4) 2,8,1
View full question & answer→
Question 54 Marks
To match:
Group in the modern periodic tableFamilies
a) 1?
b) ?Transition metals
c) ?Boron family
d) 15?
e) 17?
Answer
a) alkali metals
b) 3 to 12
c) 13
d) Nitrogen family
e) halogens
View full question & answer→
Generate Paper FreeAll CHEMISTRY CH11 Atomic Structure topics
[4 Mark Questions] - Science STD 9 Questions - Vidyadip