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प्रश्न
A change in the physical state can be brought about
पर्याय
only when energy is given to the system
only when energy is taken out from the system
when energy is either given to or taken out from the system
without any energy change
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उत्तर
when energy is either given to or taken out from the system
When energy is given to the system the solid state changes to liquid. When energy is taken out from a liquid it changes to solid e.g., ice changes to water and water to water vapours when heat energy is given. Water vapours or steam condense to water and water freezes to ice when energy is decreased.
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संबंधित प्रश्न
Write the names of the elements present in the:-
Glucose
Write the names of `"FeS"` compounds :
Name three non-metals/radicals which have valency -1, -2, and -3.
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the mass number of X?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the charge on the particle ?
Fill in the blank
If an atom loses an electron, it acquires ______ a charge.
How many times is a proton heavier than an electron?
Give scientific reason.
All the mass of an atom is concentrated in the nucleus.
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will gain electron?
Define – Atom.
______ is the smallest particle of an element.
An element is composed of ______ atoms.
The volume occupied by 1 mole of a diatomic gas at S.T.P is ______
Atoms of one element can be transmuted into atoms of other elements by ______
Give the salient features of “Modern atomic theory”.
Write any two observations which support the fact that atoms are divisible.
______ is a substance that is made up of three oxygen atoms chemically combined.
An atom of Oxygen (O) and two atoms of hydrogen (H.) combine to form a molecule of ______.
