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प्रश्न
Write true or false.
A chemical equation gives only qualitative information of a chemical reaction.
पर्याय
True
False
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उत्तर
False
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
pressure.
Write the missing reactants and products and balance the equations.
\[\ce{KClO3 ->[heat]}\] ___________+ ____________
FILL IN THE BLANK
In a ............ change, new substances are formed.
Write a short note on the information derived from a balanced chemical equation.
Write true or false :
No new substance is formed during a chemical reaction.
Name the type of chemical reaction shown by the following equation:
2Mg + O2 → 2MgO
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
Rusting of iron is a ______ chemical change.
Write the chemical reaction where the following changes are observed.
Gas is evolved
Explain,giving one example of the following chemical changes:
Reversible reaction
Give a chemical test to distinguish between the following gases.
NH3 and SO2
Give reason for the following:
Electrolytic decomposition of water is a reaction involving change of state.
Match the chemical reactions in List I with the appropriate answer in List II.
| List I | List II | ||
| 1. | \[\ce{XY⇌[heat]X + Y}\] | A: | Displacement reaction |
| 2. | \[\ce{XY->X + Y}\] | B: | Double decomposition |
| 3. | \[\ce{X+Y- + A+B^-->X+B- + A+Y-}\] | C: | Endothermic reaction |
| 4. | \[\ce{X + YZ->XZ + Y}\] | D: | Thermal dissociation |
| 5. | \[\ce{X + Y->[heat]XY -\Delta}\] | E: | Decomposition reaction |
Burning of paper is a ______ change.
________ is a chemical substance which alters the speed of a chemical reaction.
Arrange the following statements in correct sequence:
- One side is water-loving and other water-hating molecules.
- When you agitate the cloth, the dirt is surrounded by many molecules and taken away from the cloth.
- The dirt surrounded by the detergent molecules floats in the water making it dirty.
- Finally, the cloth is clean.
- The detergent molecules have two sides.
- Water hating goes and joins with dirt and oil in the cloth while the water-loving joins with the water molecules.
Classify the following as physical or chemical properties
Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
Which is used as a catalyst during the process of hydrogenation of oils?
Give an example where heat, light, and sound are produced during a chemical change.
We are advised to not to play with fireworks. Give reason.
When carbon dioxide is passed through lime water ______.
