10th Class Physical Science Chapter wise Important bit bank in English

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 _______________.

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chemical equations

2. In a chemical reaction the substance present in the left side of the arrow is called __________.

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reactants

3. In a chemical reactions the substance present in the right side is called __________.

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Products

4. Sometimes during a chemical change may form an insoluble substance known as ____________.

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precipitate

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 _____________.

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balanced reaction

6. Propane is a colorless, odorless gas often used as a _________ and __________.

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heating , cooking fuel

7. In some chemical changes heat energy is released. Such chemical reactions are called _________________.

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exothermic chemical reactions

8. In some chemical changes heat energy is absorbed. Such chemical reactions are called __________________.

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endothermic chemical reactions

9. In a chemical reaction ‘Δ’ represents ________.

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heating

10. Sometimes the reaction conditions such as ___________________ catalyst, etc are indicated above and/or below the arrow in the equation.

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temperature, pressure,

11. If a gas is evolved in a reaction, it is denoted by an upward arrow _________.

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‘↑’or (g)

12. If a precipitatet is forms in a chemical reactions, it is denoted by _____________

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downword arrow ‘↓’

13. A chemical equation gives the ratio of molecules of _________ and ___________.

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reactants, products

14. In a chemical equation the molecular masses are expressed in ‘___________’ (U),.

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Unified Masses

15. When a decomposition reaction is carried out by heating, it is called ______________ reaction.

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thermal decomposition

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 ______________.

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gram molar volume

17. 1 mole of H2 contains ___________ molecules.

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6.02×1023

18. The chemical formula of marble is __________

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CaCO3

19. Some decomposition reactions are takes place in presence of sunlight and such reactions are called ________________.

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photochemical reactions

20. A reaction in which single product is formed from two or more reactants is known as ____________ reaction.

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chemical combination

21. chemical combination reaction is a ___________ reactions.

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endothermic

22. All the ___________ reactions require energy in the form of heat, light or electricity for converting the reactants to products.

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decomposition

23. All the decomposition reactions are ___________.

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endothermic

24. Silver bromide decomposes to _______ and bromine in sunlight. Light _________ coloured silver bromide turns to gray due to sunlight.

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silver , yellow

25. When Zink is reacted with Hydro Chloric Acid, the element zinc has displaced _________ from

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hydrogen
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