Write any two observations which support the fact that atoms are divisible.
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Write any two observations in an activity which may suggest that a chemical reaction has taken place. Give the examples in support of your answer.
i. In an activity, when any of the following occurs, it suggests that a chemical reaction has taken place: a. change in state b. change in colour c. change in temperature d. evolution of...
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What is the mass of (a) 1 mole of nitrogen atoms? (b) 4 mole of aluminium atoms (Atomic mass of aluminium = 27)?
(a) The mass of 1 mole of nitrogen atoms is 14g. (b) The mass of 4 moles of aluminium atoms is (4 × 27)g = 108g (c) The mass of 10 moles...
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A sample of vitamic C is known to contain 2.58 ×1024 oxygen atoms. How many moles of oxygen atoms are present in the sample?
1 mole of oxygen atoms = 6.023×1023 atoms ∴Number of moles of oxygen atoms = 2.58 ×1024 / 6.022×1023 ...
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Give reasons for the following observations. (a) Naphthalene balls disappear with time without leaving any solid.
(a) Naphthalene shows the property of sublimation. Evaporation of naphthalene takes place easily and so it disappears during course of time without leaving a solid. (b) Perfumes vaporize very fast and...
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Give reasons for the following observations. (a) Naphthalene balls disappear with time without leaving any solid.
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Calculate the number of atoms in a cubic unit cell having one atom on each corner and two atoms on each body diagonal.
8 corner × 1/8 atom per unit cell = 1 atom There are four body diagonals in a cubic unit cell and each has two body centre atoms. So, 4 × 2...
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List any two observations when a highly reactive metal is dropped in water.
(i) Large amount of heat is evolved. (ii) Metal starts floating.
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There is an overwhelming support for the idea of democracy all over the world.support the statements
Democratic govt is preferred for the following reasons- Power in the hands of people.no single person rules the country. Citizens participate in all the matters and hence feel unified for the nation. People...
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During the experiment of heating of ferrous sulphate crystals, four students recorded their observations as:observations as:
(B) (i), (iv)
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Explain the following observations: (i) Fluorine does not exhibit any positive oxidation state.
(i) Fluorine does not exhibit any positive oxidation state as it is the most electro-negative element and does not have d orbitals in its valance shell. (ii) This is due to...
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