Advertisements
Advertisements
प्रश्न
What is a chemical reaction?
Advertisements
उत्तर
A chemical reaction is the process of breaking the chemical bonds of the reacting substances (reactants) and making new bonds to form new substances (products).
APPEARS IN
संबंधित प्रश्न
Fill in the blank:
The basic conditions necessary for a chemical reaction is _______
Give an example of a reaction where the following are involved
Electricity
Give an example of a reaction where the following are involved
Catalyst
What do you observe when Cobalt chloride paper is introduced in water vapour.
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
A coloured substance which leaves a black residue and evolves two gases one of which is acidic and coloured and the other neutral and colourless.
Two chemical species X and Y combine together to form a product P which contains both X and Y
\[\ce{X + Y -> P}\]
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct?
(i) P is a compound
(ii) X and Y are compounds
(iii) X and Y are elements
(iv) P has a fixed composition
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
What changes do you expect?
The simplest method of preventing rusting of iron is to coat it with oil, grease, or paint. The reason being ______.
Iron and rust are the same substances.
Match the following:
| Column I | Column II | ||
| 1. | Burning of coal | a. | Rusting |
| 2. | Painting of a surface | b. | Evaporation |
| 3. | Dipping iron in the water | c. | Chemical change |
| 4. | Salt from seawater | d. | Prevention of rusting |
