class 10 state board of Maharashtra
*Subject : Science 1*
*Topic : Chemical Reactions and Equations*
*1.* What is meant by reactant and product?
*2.* What is combination reaction? Give example.
*3.* What is double displacement reaction? Give one example.
*4.* What is meant by endothermic reaction and exothermic reaction? Give example of each.
*5.* Write the factors that affect the rate of a chemical reaction.
*6.* Define catalyst.
Answers
Answer:
yes you are right about this topic
Explanation:
yes you are right about this topic
Answer:
1.*The substance(s) to the left of the arrow in a chemical equation are called reactants. A reactant is a substance that is present at the start of a chemical reaction. A product is a substance that is present at the end of a chemical reaction.
2. When a combination reaction occurs between a metal and a non-metal the product is an ionic solid. An example could be lithium reacting with sulfur to give lithium sulfide. When magnesium burns in air, the atoms of the metal combine with the gas oxygen to produce magnesium oxide.
3. A double displacement reaction is a type of chemical reaction where two compounds react, and positive ions (cation) and the negative ions (anion) of the two reactants switch places, forming two new compounds or products. For example, Na2S+2HCl→2NaCl+H2S.
4.reaction in which heat energy is absorbed by the reactants is called endothermic reaction. eg: Nitrogen + Oxygen gives 2 nitrous oxide (2NO) - Q.
5. The factors that affect reaction rates are:
surface area of a solid reactant.
concentration or pressure of a reactant.
temperature.
nature of the reactants.
presence/absence of a catalyst.
6. any substance that increases the rate of a reaction without itself being consumed. Enzymes are naturally occurring catalysts responsible for many essential biochemical reactions.
Explanation:
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