Selina ICSE Class 8 Chemistry Solutions Chapter 6 Chemical Reactions

Q1. (a) Define a chemical reaction.(b) What happens during a chemical reaction?(c) What do you understand by a chemical bond?Answer:(a) A chemical reaction is any alteration of matter that entails the creation of one or more compounds having wholly distinct characteristics.b) Chemical bonds between atoms or molecules are broken during chemical reaction clusters of atoms […]

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Selina ICSE Class 8 Chemistry Solutions Chapter 1 Matter

Exercise: Q1. Define:(a) Matter(b) Intermolecular force of attraction.Answer:(a) Anything that has mass, takes up space and can be perceived by our senses is considered to be matter. Example: Air, book.(b) The molecules of matter are constantly moving and are held together by an attraction between them known as the intermolecular force of attraction. Q2. What […]

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Selina ICSE Class 8 Chemistry Solutions Chapter 5 Language of Chemistry

Exercise Q1. Define:(a) Radical(b) Valency(c) Molecular formulaAnswer:(a) Radical: An atom of an element or a collection of atoms from other elements that behave as a single unit and have a positive or negative charge on them is referred to as a radical.(b) Valency: The quantity of electrons that an atom’s valence shell contributes to or […]

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Selina ICSE Class 8 Chemistry Solutions Chapter 2 Physical and Chemical Changes

EXERCISE Q1. Define: (a) a physical change, (b) a chemical change. Give two examples for the above changes.Answer:(a) A physical change is a temporary alteration in which the original substance’s does not change and its physical characteristics, such as colour, condition, shape, and size, may change. Example: Boiling of water, Melting of ice.(b) A chemical […]

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Selina ICSE Class 8 Chemistry Solutions Chapter 7 Hydrogen

Exercise 1. Fill in the blanks:(a) Hydrogen is __________ than air.(b) Hydrogen is __________ soluble in water.(c) Hydrogen bums with a __________ flame and __________ sound is heard.(d) A __________ hydrogen in the reactivity series gives hydrogen with water.(e) Hydrogen reacts with metal oxides to form __________ and __________.(f) Oxidation is the removal of __________ […]

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Selina ICSE Class 8 Chemistry Solutions Chapter 9 Carbon and Its Compounds

Exercise – I Q1. Fill in the blanks.(a) __________ is present in both living and non-living things.(b) The tendency of an element to exist in two or more forms but in the same physical state is called __________.(c) __________ and __________ are the two major crystalline allotropes of carbon.(d) __________ is the hardest substance that […]

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Selina ICSE Class 8 Chemistry Solutions Chapter 4 Atomic Structure

Exercise Q1. Fill in the blanks.(a) Dalton _ that atoms could not be divided(b) An ion which has a positive charge is called a _.(c) The outermost shell of an atom is known as _.(d) The _ of an atom is very hard and dense.(e) Neutrons are _ particles having mass equal to that of […]

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Selina ICSE Class 10 Physics Solutions Chapter 4 Refraction Of Light At Plane Surfaces

Exercise-4A Question 1. What do you understand by refraction of light?Solution:Refraction of light refers to the shift in the direction of the light’s path when it moves from one transparent material to another. Question 2. Draw diagrams to show the refraction of light from(i) Air to glass in diagram, label the incident ray, refracted ray, and the […]

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Selina ICSE Class 10 Physics Solutions Chapter 11 Calorimetry

Exercise-11A Question 1. Define the term heat.Solution:The thermal energy of a material is the kinetic energy brought on by the random motion of its molecules. Question 2. Name the S.I. unit of heat.Solution:Joule is the S.I. unit of heat (symbol J). Question 3. Define the term calorie. How is it related to joule (the S.I. unit of heat)?Solution:The […]

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