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- Elements & Compounds
Class-6 Dalal New Simplified ICSE Chemistry Solutions Chapter-2
Classify substances into pure and impure substances in the form of a chart or tabulation.
Differentiate between the terms – elements, compounds & mixtures.
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,
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
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.
- Chlorine – greenish yellow
- Nitrogen dioxide – reddish brown.
(c) Carbon monoxide
Complete the statement – an element is a pure substance made up of (identical/different) atoms.
An element is a pure substance made up of identical atoms.
Draw a labelled diagram of an atom including its nucleus, orbits & their contents.
Elements are classified into – Metals – Non-metals – Metalloids – Noble gases. State which of A, B, C, D is a –
- Metallic element
- Non-metallic element
- 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____
A: Non metallic element
B: Metallic element
C: Noble gas
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.
(a) Hydrogen by ‘H’
(b) Helium by ‘He’
(c) Copper by ‘Cu’
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
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
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
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
Give a reason why elements are tabulated in a table called the ‘Periodic table’.
for easy in a simple and systematic manner. study Elements are tabulated in a table called ‘periodic table’
“Salient feature of periodic table”
- Horizontal rows are called periods
- vertical columns are called groups.
- Metallic elements are placed on the left side
- non-metallic elements are placed on the right.
- Noble gases are on the extreme right.
Give the names and symbols of the first twenty elements of the periodic table. Differentiate them into metals, non-metals, metalloids and noble gases.
Explain the term – molecules. Give three examples of atoms of the same element forming a molecule. State the atomicity of the same.
Atoms of the same element or different elements combine to form a molecule.
Atoms of the same element forming a molecule
Give one example of
(a) a triatomic molecule
(b) a polyatomic molecule.
(a) a triatomic molecule-O3 (Ozone)
(b) a polyatomic molecule.-P5 (sulphur)
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.
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