2. Chemical Reactions and Equations
1. The description of chemical reactions in a sentence or it can be written in shorter form as a word equation is called _______________.
2. In a chemical reaction the substance present in the left side of the arrow is called __________.
3. In a chemical reactions the substance present in the right side is called __________.
4. Sometimes during a chemical change may form an insoluble substance known as ____________.
5. A chemical equation in which the numbers of atoms of different elements on the reactants side (left side) are same as those on product side (right side) is called a _____________.
6. Propane is a colorless, odorless gas often used as a _________ and __________.
7. In some chemical changes heat energy is released. Such chemical reactions are called _________________.
8. In some chemical changes heat energy is absorbed. Such chemical reactions are called __________________.
9. In a chemical reaction ‘Δ’ represents ________.
10. Sometimes the reaction conditions such as ___________________ catalyst, etc are indicated above and/or below the arrow in the equation.
11. If a gas is evolved in a reaction, it is denoted by an upward arrow _________.
12. If a precipitatet is forms in a chemical reactions, it is denoted by _____________
13. A chemical equation gives the ratio of molecules of _________ and ___________.
14. In a chemical equation the molecular masses are expressed in ‘___________’ (U),.
15. When a decomposition reaction is carried out by heating, it is called ______________ reaction.
16. 1 gram molar mass of any gas at STP i.e, standard temperature 273K and standard pressure 1 bar, occupies 22.4 litres known as ______________.
17. 1 mole of H2 contains ___________ molecules.
18. The chemical formula of marble is __________
19. Some decomposition reactions are takes place in presence of sunlight and such reactions are called ________________.
20. A reaction in which single product is formed from two or more reactants is known as ____________ reaction.
21. chemical combination reaction is a ___________ reactions.
22. All the ___________ reactions require energy in the form of heat, light or electricity for converting the reactants to products.
23. All the decomposition reactions are ___________.
24. Silver bromide decomposes to _______ and bromine in sunlight. Light _________ coloured silver bromide turns to gray due to sunlight.
25. When Zink is reacted with Hydro Chloric Acid, the element zinc has displaced _________ from
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