……………. defined an element as any substance that cannot be decomposed into further simple substance by physical or chemical change.
A) Charles
B) Robert Boyle
C) Avagadro
D) Madam Curie
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this is the place where the meeting will be held. change into simple sentence
Meeting will be held in this place.
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Fill in the blanks If heat energy is given to a substance and its temperature remains constant then the substance undergoes a change in_______.
Correct Answer - state
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The sum of the masses of reactants and products is equal in any physical or chemical reaction. This is in accordance with ………………
(C) law of conservation of mass Mass neither created nor destroyed therefore in a chemical or physical reaction, the mass is conserved this is known as law of conservation of mass.
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The sum of the masses of reactants and products is equal in any physical or chemical reaction. This is in accordance with ………………
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The three identical samples of potassium chlorate are decomposed. The mass of oxygen is determined to be 3.87 g, 3.95 g and 3.89 g for the set.
Mean = \(\frac{3.87+3.95+3.89}{3}\) = 3.90 Sample Mass of oxygen Absolute deviation = | Observed value – Mean | 1 3.87 g 0.03 g 2 3.95 g 0.05 g 3 3.89 g 0.01 g Mean absolute deviation = \(\frac{0.03+0.05+0.01}{3}\) = 0.03 ∴ Mean absolute deviation = \(\pm0.03g\) Relative deviation = \(\frac{Mean\,absolute\,deviation}{Mean}\) x 100% = \(\frac{0.03}{3.90}\) x...
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The property of an element to exist in two or more physical forms with same chemical properties but different physical properties is called
C) allotropy
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Judgement in Lok adalats cannot be claimed for further prosecution. Neelima says the following reasons for this ……………..
Correct option is C) 1,2
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The basic form of matter that cannot be broken down into simpler substances in chemical reactions is ………………
Correct option is B) compound
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Which of the given mixtures cannot be separated by simple physical method ?
D) Oxygen from water
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Element is a basic form of matter that cannot be broken down into simple forms by chemical reactions.
Correct option is D) Compound
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