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प्रश्न
Why does a light paddle wheel placed in the path of cathode rays begin to rotate, when cathode rays fall on it?
उत्तर
It is because the small particles of the cathode rays (electrons) have mass and energy. This energy is used in rotating the paddle wheels.
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संबंधित प्रश्न
In a reaction, 5.3 g of sodium carbonate reacted with 6 g of acetic acid. The products were 2.2 g of carbon dioxide, 0.9 g water and 8.2 g of sodium acetate. Show that these observations are in agreement with the law of conservation of mass.
Sodium carbonate + acetic acid → sodium acetate + carbon dioxide + water
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?
State the law of conversation of mass.
What do you observe when, barium chloride solution is mixed with sodium sulphate solution ?
When magnesium is burnt in air, there is an increase in mass after the reaction.
Name the scientist who gave law of conservation of mass.
‘If 100 grams of calcium carbonate (whether in the form of marble or chalk) are decomposed completely, then 56 grams of calcium oxide and 44 grams of carbon dioxide are obtained’. Which law of chemical combination is illustrated by this statement ?
Copper sulphate reacts with sodium hydroxide to form a blue precipitate of copper hydroxide and sodium
sulphate. In an experiment, 15.95 g of copper sulphate reacted with 8.0 g of sodium hydroxide to form
9.75 g of copper hydroxide and 14.2 g of sodium sulphate. Which law of chemical combination is illustrated by this data ? Give reason for your choice.
Select the correct answer from A, B, C, D & E for the statement given below:
In Landolt’s experiment – the form in which the chemical energy stored up in the reactants __________ is released.
Match the following.
| Law of conservation of mass | Sir William Crookes |
| Law of constant proportion | James Chadwick |
| Cathode rays | Joseph Proust |
| Anode rays | Lavoisier |
| Neutrons | Goldstein |
