Give any two uses of isotopes.
Answer: An isotope is any form of a chemical element that has the same number of protons in the nucleus,... View Article
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Explain with examples (i) Atomic number, (ii) Mass number, (iii) Isotopes and (iv) Isobars.
Answer: Atomic number (Z) The total number of protons in the nucleus of an atom gives us the atomic number... View Article
Write the electronic configuration of any one pair of isotopes and isobar.
Answer: Isotopes Atoms with the same number of protons but different numbers of neutrons are called isotopes. This, in turn,... View Article
For the symbol H, D and T, tabulate three subatomic particles found in each of them.
Answer: A subatomic particle is a particle with a size smaller than that of an atom. Protons, electrons, and neutrons... View Article
Draw a sketch of Bohr’s model of an atom with three shells.
Answer: The Bohr model of the atom was proposed by Neil Bohr in 1915. It came into existence with the... View Article
What are the canal rays?
Answer: Canal rays are positively charged radiations consisting of particles which have a charge equal in magnitude but opposite in... View Article
If one mole of carbon atoms weighs 12grams, what is the mass (in grams) of 1 atom of carbon?
Answer: In a substance, the amount of entities present for e.g. atoms, molecules, ions, is defined as a mole.A mole... View Article
Write down the formulae of (i) sodium oxide (ii) aluminium chloride (iii) sodium sulphide (iv) magnesium hydroxide
Answer: The chemical formula of a compound is a symbolic representation of its chemical composition. Chemical formulae provide insight into... View Article
Why is it not possible to see an atom with naked eyes?
Answer: An atom cannot be visible to the naked eyes because, Atoms are miniscule in nature, measured in nanometres Except... View Article
Which postulate of Dalton’s atomic theory can explain the law of definite proportions?
Answer: The postulates of Dalton’s atomic theory that can explain the law of definite proportions is – the relative number... View Article
Hydrogen and oxygen combine in the ratio of 1:8 by mass to form water. What mass of oxygen gas would be required to react completely with 3 g of hydrogen gas?
Answer: The law of constant proportions states that chemical compounds are made up of elements that are present in a... View Article
Explain the mechanism of the cleaning action of soaps.
Answer: The majority of the soil is oily, and dirt will not dissolve in water. Soap is made up of... View Article
Give a test that can be used to differentiate between saturated and unsaturated hydrocarbons.
Answer: Bromine water test is used to differentiate between the unsaturated compounds and the saturated compounds. Bromine water test A... View Article
Which of the following hydrocarbons undergo addition reactions: C2H6, C3H8, C3H6, C2H2 and CH4.
Answer: C3H6 and C2H2 Unsaturated hydrocarbons undergo addition reactions. C3H6 and C2H2 are unsaturated hydrocarbons which undergo addition reactions. Addition... View Article
What change will you observe if you test soap with litmus paper (red and blue)?
Answer: A soap is a water-soluble compound which is made via a process called saponification by the reaction between sodium... View Article
Explain the formation of scum when hard water is treated with soap?
Answer: The word ‘hard water’ refers to water with a high mineral content. Hard water is formed when water percolates... View Article
Why are carbon and its compounds used as fuels for most applications?
Answer: Reason for using carbon and its compounds as fuels for most applications are listed below. Carbon compounds are very... View Article
Why does micelle formation take place when soap is added to water? Will a micelle be formed in other solvents such as ethanol also?
Answer: A soap molecule is a sodium or potassium salt of long-chain carboxylic acid. It is composed of two sections,... View Article
What is a homologous series? Explain with an example.
Answer: A homologous series is a series of compounds, which has the same functional group. This also contains similar general... View Article
Draw the electron dot structures for (a) ethanoic acid (b) H2S (c) propanone (d) F2
Answer: Electron dot structures or Lewis dot formula can be drawn if the molecular formula of the compound is known.... View Article
