‘What is a Chemical Reaction?’ is one of the important topics on which students can be asked to write a paragraph in exams in school. Chemical reactions occur when substances interact and transform into new substances, playing a crucial role in nature, life processes, and everyday activities. Please check the various versions (in 100 words, 150 words, 200 words, and 300 words) provided below for the paragraph.
Paragraph on ‘What is a Chemical Reaction?’ in 100 words
A chemical reaction happens when two or more substances combine to make something new. These substances are called reactants. When they react, they form products. For example, when you mix baking soda with vinegar, they react and create bubbles. The bubbles are carbon dioxide gas, a new substance. Chemical reactions can change color, and temperature, or even produce light. These changes show that the reaction is happening. Reactions are everywhere – in the air, in food, and even in our bodies!
Paragraph on ‘What is a Chemical Reaction?’ in 150 words
A chemical reaction is when substances like liquids, gases, or solids change into new substances. The original substances are called reactants, and the new ones are called products. A good example of a chemical reaction is when you mix vinegar and baking soda. They react to form bubbles and make a gas called carbon dioxide. In a reaction, the molecules of the reactants rearrange to make new molecules. Chemical reactions can also change things like color or temperature. Sometimes, reactions release heat or light. They are all around us, from the food we eat to the way plants grow. In fact, our bodies use chemical reactions to give us energy.
Paragraph on ‘What is a Chemical Reaction?’ in 200 words
A chemical reaction is when one or more substances change into new substances. This happens when the particles of the substances rearrange themselves. The substances that start a chemical reaction are called reactants. The new substances that are created are called products. A simple example is mixing vinegar and baking soda. When combined, they create bubbles and release a gas called carbon dioxide. This is a sign that a chemical reaction is happening.
Chemical reactions can make different changes. For instance, some reactions make heat, while others might make light. Some reactions cause color changes, like when you mix certain liquids that change color when they react. Some reactions even happen inside our bodies. For example, when we eat food, our body uses chemical reactions to turn it into energy. In nature, plants use a reaction called photosynthesis to make their food using sunlight, water, and carbon dioxide. Chemical reactions are important for life to exist, and they happen everywhere.
Paragraph on ‘What is a Chemical Reaction?’ in 300 words
A chemical reaction is a process where two or more substances interact and change into new substances. These substances are called reactants before the reaction happens. After the reaction, the new substances formed are called products. A chemical reaction usually involves breaking and forming bonds between molecules. A simple example of a chemical reaction is mixing vinegar and baking soda. When they react, they make bubbles, and the product is carbon dioxide, a gas. This shows that a chemical reaction has occurred.
Chemical reactions happen all around us. For example, when we cook food, chemical reactions take place. When you heat an egg, the proteins in the egg change, and it becomes solid. This is a chemical change. Reactions can also happen in nature. For instance, plants use a reaction called photosynthesis, where they take in carbon dioxide from the air, water from the soil, and sunlight to create food in the form of sugar. This reaction helps plants grow.
Some chemical reactions can be seen, like when baking soda and vinegar bubble. Others are not so easy to see, like the way our bodies turn food into energy. Chemical reactions can also change the temperature. Some reactions make things hot, like when you burn wood in a fire. Others, like mixing cold chemicals, can make things cold. Chemical reactions are essential for many processes in nature, in our daily lives, and even in the way our bodies work. Without chemical reactions, life as we know it wouldn’t be possible.
MCQ’s on ‘What is a Chemical Reaction?’
1. What happens in a chemical reaction?
A) Substances disappear
B) Substances change into new substances
C) Substances remain the same
D) Substances mix but do not change
2. What are the substances called before a chemical reaction?
A) Products
B) Reactants
C) Elements
D) Molecules
3. What is an example of a chemical reaction?
A) Ice melting
B) Water boiling
C) Mixing vinegar and baking soda
D) Water evaporating
4. What gas is produced when baking soda reacts with vinegar?
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Hydrogen
5. Which of these can happen during a chemical reaction?
A) Change in color
B) Change in shape
C) Change in state of matter
D) All of the above
6. Which process in plants is an example of a chemical reaction?
A) Respiration
B) Photosynthesis
C) Digestion
D) Evaporation
7. What do chemical reactions in our bodies help us do?
A) Grow taller
B) Breathe
C) Get energy
D) See better
8. What can chemical reactions produce besides new substances?
A) Heat
B) Light
C) Temperature changes
D) All of the above
9. What happens when you heat an egg?
A) Physical change
B) Chemical change
C) No change
D) It melts
10. What is the main characteristic of a chemical reaction?
A) It only happens in living organisms
B) It involves a rearrangement of particles
C) It causes no physical changes
D) It only happens in liquids
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