Explanation:
A barrier present at the open sides of stair case and platforms that prevent falling is known as a banister.
This banister is very helpful for old people and children as they need a support to move upwards whether it is a stairways or a platform.
Also, a banister is not used by any particular age group. It is for the people as a support to prevent them from falling.
Answer: Formation of precipitate indicates that there has been a chemical reaction.
Explanation:
Chemical reaction: It is defined as change in arrangement of the atoms so as to form a new substance.
Mixing of two clear solutions that is lead nitrate and potassium iodide gives out yellow solid precipitate of lead iodide with aqueous solution of potassium nitrate.
The physical evidence which indicates that chemical reaction has been taken place is formation of yellow solid precipitate of lead iodide ,(
).
Answer:
Sulfur (S)
Explanation:
Elements present in the same group share common chemical properties. Oxygen, Sulphur and other elements are present in group 16/VIA which is also known as chalcogens.
Sulphur and Oxygen have similar electronic configuration. They share the same chemical properties as they are associated with the same group. Oxygen and Sulphur reacts with the Hydrogen gas in a similar manner. They do not belong to the same period.
Answer:
The Surface Of The Earth
Explanation:
The Troposphere contains about half of all the air in the entire atmosphere. Because it is at the bottom, air pressure, or the weight of the air, is greatest in this layer. (The surface of the earth is in this layer, making it the answer.)
All of them could mean that a reaction has occurred
