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Subjects

Science

Chemical Reactions and Equations

रासायनिक अभिक्रियाएँ और समीकरण

In Class 10 Science, under the chapter Chemical Substances – Nature and Behaviour, this topic introduces chemical reactions as changes that form new substances. Students learn to identify reactants and products, represent reactions through word and chemical equations, and write balanced equations using correct chemical formulae while following the law of conservation of mass.

Practice questions

What does an upward arrow generally show in a chemical equation?What does a downward arrow generally show in a chemical equation?What is a chemical equation called when the number of atoms of each element is not the same on the reactant and product sides?Why should chemical formulae not be changed while balancing a chemical equation?When oxygen is added to a substance, what is the process called?When oxygen is removed from a substance, what does the substance generally undergo?Hydrogen and oxygen react to form water. Which type of reaction is this?Which gas is used as a reactant during photosynthesis in plants?What can a change in temperature during a chemical reaction indicate?What is an equation in which the names of reactants and products are written in words called?Why is a balanced chemical equation necessary?What are coefficients used for in a chemical equation?What are reactants in a chemical reaction?What are products in a chemical reaction?When limestone, \(\mathrm{CaCO_3}\), is heated, it breaks down into calcium oxide and carbon dioxide. Which type of reaction is this?When electric current is passed through water, it decomposes into hydrogen and oxygen. What type of reaction is this?What is a decomposition reaction caused by light called?What main change occurs when silver bromide is exposed to light?What is a reaction called in which two or more reactants combine to form a single product?When a single compound breaks down to form two or more products, what type of reaction is it called?