Question
Why is it necessary to use the symbol for the elements?
✓
Answer
Yes it is necessary to write symbols for element because it makes equations easy to write as well as to read and understand. they also saves time and complexity. e.g Consider the following chemical reaction Zinc + Sulphuric acid → Zinc sulphate + Hydrogen gas This can be written easily using symbols as $\text{Zn}+\text{H}_2\text{SO}_4\rightarrow\text{ZnSO}_4+\text{H}_2$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Give four important functions of epithelial tissue. Name one specific place in the body where each function is carried out.
Define acceleration and state its SI unit. For motion along a straight line, when do we consider the acceleration to be:
- Positive.
- Negative? Give an example of a body in uniform acceleration.
A bus is moving with a speed $72km/h$ can be stopped by brakes after at least $10m$. What will be the minimum stopping distance, if the same bus is moving at a speed of $144km/h$?
→What precautions can you take in your school to reduce the incidence of infectious diseases?
Classify the following as physical or chemical changes:
- Cooking of food.
- Boiling of water.
- Cutting of trees.
- Dissolving salt in water.
- Digestion of food.
- Melting of ice.
When $5g$ of calcium is burnt in $2g$ of oxygen, then $7g$ of calcium oxide is produced. What mass of calcium oxide will be produced when $5g$ of calcium is burnt in $20g$ of oxygen? Which law of chemical combination will govern your answer?
→You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without testing?
A cube of side $5\ cm$ is immersed in water and then in saturated salt solution. In which case will it experience a greater buoyant force. If each side of the cube is reduced to $4\ cm$ and then immersed in water, what will be the effect on the buoyant force experienced by the cube as compared to the first case for water. Give reason for each case.
→The speed-time graph of a car is given. The car weighs 1000 kg .
i. What is the distance travelled by car in the first 2 s ?
ii. What is the braking force applied at the end of 5 s to bring the car to stop within one second?
i. What is the distance travelled by car in the first 2 s ?
ii. What is the braking force applied at the end of 5 s to bring the car to stop within one second?
Write a note on lichens.