Class-6 Dalal Elements Compounds and Mixtures ICSE Chemistry

Class-6 Dalal Elements Compounds and Mixtures ICSE Chemistry New Simplified Solutions Dr Viraf J Dalal Middle School Allied Publishers Solutions. Chapter-2. We Provide Step by Step Solutions of Exercise/Lesson -2  Elements Compound and Mixtures with Objective Type Questions, Fill in the blanks and Give reason , Match the following of Dr Viraf J Dalal Middle School Chemistry Allied Publishers. Visit official Website CISCE for detail information about ICSE Board Class-6.

Class-6 Dalal Elements Compounds and Mixtures ICSE Chemistry New Simplified Solutions Chapter-2


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Exercise-Element & Compound

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Objective- Element & Compound

Exercise-Mixture

Objective-Mixture


Exercise- Elements & Compounds

Class-6 Dalal New Simplified ICSE Chemistry  Solutions Chapter-2

Question 1.
Classify substances into pure and impure substances in the form of a chart or tabulation.
Answer 2:
substances into pure and impure substances in the form of a chart

Question 2.
Differentiate between the terms – elements, compounds & mixtures.
Answer 2:

Element –

Element is the basic unit of matter, which cannot be broken down into more simpler substances by any way but can be combined to form new substances.It is a pure substance and classified into metals, non-metals, metalloids and noble gases.

Example – Sulphur, Gold , Iron, Hydrogen, Carbon, Oxygen

Compounds –  combination of two or more elements in fix ratio Through chemical reactions  are called Compound. with new properties other than components Example – Glucose, Oil, Water,

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Mixtures – a combination of two or more elements in any ratio with same properties as components

Example – Sugar Syrup, Salty Water, Air, Chalk powder, Washing Soda

Question 3.
The important physical properties of substances are colour, odour, nature, density & solubility in water. Name –
(a) two coloured gases (with their colours)
(b) a gas with a pungent, choking odour which is lighter than air
(c) a poisonous gas almost as heavy as air.
Answer 3:
(a)

  1. Chlorine – greenish yellow
  2. Nitrogen dioxide – reddish brown.

(b) Ammonia.
(c) Carbon monoxide

Question 4.
Complete the statement – an element is a pure substance made up of (identical/different) atoms.
Answer 4:
An element is a pure substance made up of identical atoms.

Question 5.
Draw a labelled diagram of an atom including its nucleus, orbits & their contents.
Answer 5:
new-simplified-chemistry-class-6-icse-solutions-elements-compounds-mixtures - 2

Question 6.
Elements are classified into – Metals – Non-metals – Metalloids – Noble gases. State which of A, B, C, D is a –

  1. Metallic element
  2. Non-metallic element
  3. Metalloid
  4. Noble gas.

A : Is non-malleable, non-ductile & a poor conductor of electricity____
B : Has lustre, is malleable and ductile & a good conductor of heat ____
C : Is unreactive and inert and present in traces in air____
D : Shows properties of both metals and non-metals____
Answer 6:

A: Non metallic element

B: Metallic element

C: Noble gas

D:Metalloid

Question 7.
An atom of an element is denoted by a ‘symbol’. Explain the meaning of the term “symbol” State a reason for representing the following elements by their symbols.

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(a) Hydrogen by ‘H’
(b) Helium by ‘He’
(c) Copper by ‘Cu’

Answer 7:
Symbols : The short form or abbreviated name of the element (or radicals)
The reason for representing the following elements by their symbols are as follow :

(a) Hydrogen by ‘H’ – First letter of the name of element
(b) Helium by He – First two letters of the name of Noble gases.
(c) Copper by ‘Cu’ – Deriving symbols from their Latin names

Question 8.
Match the metallic elements – with their correct symbols Metallic

(a) Potassium (b) Sodium (c) Calcium (d) Magnesium (e) Zinc (f) Aluminium (g) Iron (h) Lead (i) Copper (j) Mercury (k) Silver (l) Platinum (m) Gold

Symbols – (1) Ca (2) Zn (3) Pb (4) Hg (5) Cu (6) Au (7) K (8) Fe (9) Al (10) Na (11) Mg (12) Pt (13) Ag

Answer 8:

Metallic Elements Symbols
(a) Potassium K
(b) Sodium Na
(c) Calcium Ca
(d) Magnesium Mg
(e) Zinc Zn
(f) Aluminum Al
(g) Iron Fe
(h) Lead Pb
(i) Copper Cu
(j) Mercury Hg
(k) Silver Ag
(l) Platinum Pt
(m) Gold Au


Question 9.

Match the non-metallic elements – with their correct symbols

Non- Metallic elements –

(a) Carbon (b) Chlorine (c) Oxygen (d) Phosphorus (e) Hydrogen (f) Nitrogen (g) Iodine (h) Bromine (i)Fluorine (j) Silicon (k) Sulphur

Symbols – (1) O (2) I (3) Si (4) C (5) Cl (6) P (7) F (8) H (9) S (10) Br (11) N

Answer 9:

Non-metallic elements Symbol
(a) Carbon C
(b) Chlorine Cl
(c) Oxygen O
(d) Phosphorus P
(e) Hydrogen H
(f) Nitrogen N
(g) Iodine I
(h) Bromine Br
(i) Fluorine F
(j) Silicon Si
(k) Sulphur S

 

Question -10.

Match the noble gases – with their correct symbols.

Noble gases –

(a) Helium (b) Neon (c) Argon (d) Krypton (e) Xenon (f) Radon

Symbols – (1) Ar (2) Xe (3) Rn (4) He (5) Kr (6) Ne

Answer -10:

Noble gases Symbol
(a) Helium He
(b) Neon Ne
(c) Argon Ar
(d) Krypton Kr
(e) Xenon Xe
(f) Radon Rn


Question 11.

Give a reason why elements are tabulated in a table called the ‘Periodic table’.
Answer 11:

for easy in a simple and systematic manner. study Elements are tabulated in a table called ‘periodic table’

“Salient feature of periodic table”

  1. Horizontal rows are called periods
  2.  vertical columns are called groups.
  3. Metallic elements are placed on the left side
  4.  non-metallic elements are placed on the right.
  5.  Noble gases are on the extreme right.

Question 12.
Give the names and symbols of the first twenty elements of the periodic table. Differentiate them into metals, non-metals, metalloids and noble gases.
Answer 12:

Metal Symbol Non-Metal Symbol
Lithium Li Hydrogen H
Beryllium Be Carbon C
Sodium Na Nitrogen N
Magnesium Mg Oxygen O
Aluminium Al Fluorine F
Potassium K Phosphorus P
Calcium Ca Sulphur S
Chlorine Cl

 

Metalloids Symbol Noble Gases Symbol
Boron B Helium He
Silicon Si Neon Ne
Argon Ar

 

Question 13.

Explain the term – molecules. Give three examples of atoms of the same element forming a molecule. State the atomicity of the same.
Answer 13:
Atoms of the same element or different elements combine to form a molecule.
Atoms of the same element forming a molecule

  1. Oxygen
  2. Nitrogen
  3. Hydrogen
Element Molecule Atomicity
1. Oxygen O2 2
2. Hydrogen H2 2
3. Nitrogen N2 2

 

Question 14. 
Give one example of
(a) a triatomic molecule
(b) a polyatomic molecule.
Answer 14:
(a) a triatomic molecule-O3 (Ozone)

(b) a polyatomic molecule.-P5 (sulphur)

Question 15.
Explain the term compounds. Give the example of a compound containing

(a) hydrogen and oxygen
(b)carbon and oxygen
(c) nitrogen and oxygen
(d) calcium and oxygen.

Answer 15:
 compound – A pure substance made up of two or more different elements combined chemically in a fixed ratio is called compound.

Example of a compound

(a) Water = H2O
(b) Carbon dioxide,  = CO2
(c) Nitrogen dioxide, = NO2
(d) Calcium oxide, = CaO

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