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Exphub Class 10 Notes Science Chapter 1
Exphub Class 10 Notes Science Chapter 1 . Solutions are in PDF form below.
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Exphub Class 10 Notes Science Chapter 1 Summary
Chemical reactions and equations are important ideas in chemistry. They show how substances change into new ones by breaking and forming chemical bonds. These reactions obey rules about the amount of stuff (mass) and energy, keeping them the same before and after.
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Chemical equations are like shortcuts that represent these reactions, showing what’s involved and what happens. Knowing about chemical reactions and equations helps us guess what will happen in reactions, plan how to make things in factories, and understand nature at a tiny level.
Chemical Reactions and Equations Some Important Points.
Chemical Reactions: Chemical reactions move around atoms to make new things with different properties. There are different types of reactions like putting things together (synthesis), breaking things apart (decomposition), swapping one part for another (single replacement), swapping two parts (double replacement), burning things (combustion), and reacting acids with bases. Starting things are called reactants and what’s made is called products.
Chemical Equations: Chemical equations are shortcuts that show reactions using symbols and formulas. The starting stuff is on the left, and the new stuff is on the right, with a plus sign (+) in between. The numbers in front of formulas show how much of each thing is involved.
Balancing Equations: Balancing equations means making sure there are the same number of each kind of atom on both sides. We do this by adjusting the numbers in front of formulas. This follows the rule that stuff can’t just appear or disappear in reactions.
Types of Chemical Reactions:
Putting things together: Two or more things combine to make one.
Breaking things apart: One thing splits into two or more smaller things.
Swapping one part: One thing trades a part with another.
Swapping two parts: Two things exchange parts, making two new things.
Burning things: Something reacts quickly with oxygen, often giving off heat and light.
Reacting acids with bases: Acids and bases mix to make salt and water.
Concentration: More stuff reacting usually means faster reactions.
Temperature: Hotter things react faster because they have more energy.
Catalysts: These speed up reactions by making a different way for them to happen.
Surface Area: Smaller bits of stuff react faster because there’s more area to react.
Applications: Chemical reactions and equations are used in making lots of things like fertilizers, medicines, and plastics. Understanding reactions helps us study pollution, climate change, and natural processes like photosynthesis and breathing. In everyday life, we use chemical reactions for cooking, cleaning, and digesting food.
Environmental Impact:Some reactions make bad things as well as good ones, which can hurt the environment. People are working to make processes that don’t hurt the environment as much, like green chemistry that focuses on being nice to nature.
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