Ques :- Written assignment from "chemical reaction and equations", "life processes"
a) 10 very short question answers (1 mark each).
b) 5 short question answers (2 mark each).
c) 5 question answers (3 mark each).
Plz give me the right answer
Answers
Answer:
Explanation:
Chemical Reaction
Definition:When two or more substances react and form some new substance, it is called a chemical reaction.
Let us see few activities related to chemical reaction:
chemical reaction
1. Burning of magnesium ribbon: the magnesium ribbon we bring has a layer of carbonate on it so before burning it needs to be cleaned with sandpaper.
Products : magnesium oxide (white color_MgO)
Identification property of reaction: white dazzling flame
chemical reaction
2.Reacting zinc granules with dilute sulphuric acid
Chemical reaction : H2So4+Zn--- ZnSo4+H2
Products : zinc-sulphate and hydrogen gas
Identification: beaker becomes hot and hydrogen gas is produced which makes match stick burn with pale blue flame and popping sound.
chemical reaction
3.Reacting barium iodide with lead chloride
Chemical reaction : BaI+PbCl2→BaCL2+Pb
Products : barium chloride white color and yellow color precipitate of lead iodide.
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Related - Tips to score 95% in Class 10 Science Paper
Characteristics of a chemical reaction
It is either accompanied by a change in colour.
It either leads to a change in state.
Heat energy is produced or absorbed.
Precipitate is formed.
Gas is released.
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Chemical Equation and Balancing
Chemical equation: it is the representation of chemical reaction in terms of symbols, molecular
formulas, moles, states, etc.
As we know, all chemical reaction obeys law of chemical combination. Therefore, chemical
reactions need to be balanced. It is done by hit and trial method. (For practice, questions are
solved in the end).
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Class 10 Science Chapters
Our Environment
Sources of Energy
Sustainable Management of Natural Resources
Magnetic Effect of Electric Current