Question

डी ए वी पुलिस पब्लिक स्कूल हिंदी कक्षा पांच हिंदी पाठ 13 प्रिय पौधा आंतरिक प्रश्न उत्तर
Please give me answers of this page its urgent ​

Answer 1

Answer:

डी ए वी पुलिस पब्लिक स्कूल हिंदी कक्षा पांच हिंदी पाठ 13 प्रिय पौधा आंतरिक प्रश्न उत्तर

Explanation:

refer to the given attachment

hope it helps you

Answer 2

Answer:

t appears to me that you may be confused with what is meant by a “pure substance” and what is meant by the term “element.” An element is substance that is made up of one kind of atom. All the 118 known elements are listed on the periodic table. Gold is an element, as is oxygen, chlorine and sodium. If you have a chunk of gold in your hand that only contains gold atoms, it is said to be “pure gold.” Individual atoms, not mixed with other elements, are “pure” (the oxygen (formula O2) you would use from a tank in oxy-acetylene welding, is a pure substance).

In chemistry, when two or more substances are put together without a chemical change, the resulting substance is called a mixture. Air is a mixture of various gases like oxygen, carbon dioxide, nitrogen, argon, etc. It’s fairly easy to separate these substances out of the air. Seawater is another mixture of various salts and water. The individual substances in a mixture keep their properties in the mixture. For example, the water in sea water is still “water,” two atoms of hydrogen bonded with one atom of oxygen. It’s easy to get the water out of sea water, just let it evaporate and catch the evaporating water molecules. A mixture is not chemically “pure” because it is composed of different kinds of atoms.

In chemistry a compound is composed of two or more different elements combined together where the atoms are held together with energy (called bonding). It is much harder to separate the elements in a compound because the electrons of the elements are held together with energy. Salt is a compound comprised of the element’s sodium and chlorine; whose chemical formula is NaCl. The properties of salt are very different from the properties of sodium and chlorine. Sodium in its pure form is a silver metal that explodes when it comes in contact with water. Chlorine in its pure form is a yellow-green gas poisonous to people. Separately each can kill human beings. Combined together in salt (NaCl), they form a compound that is necessary for life.

Each element on the periodic table is only made up of one kind of atom and is said to be “pure.”

A compound is made up two or more elements chemically bonded together. While the individual separate elements in the compound are “pure,” the compound itself is not referred to as “pure.” It is called a molecule.

A mixture, like the air we breathe, is a number of compounds and elements found together but not chemically bonded together. Air is mostly made of nitrogen, oxygen, carbon dioxide and Argon ( N2, O2, CO2 and Ar). While the individual atoms are “pure,” the compounds are not considered pure, and neither is the mixture of we call “air.”

For the chemists reading this, I realize this is not the entire story. I am attempting to answer the question in a meaningful way based on the question

Explanation: