Mendeleev’s periodic table shocked the scientific community because it contradicted earlier findings about element mass and properties. true or false?

FALSE

Explanation:

The organization of the elements was presented by Mendeleev to the scientific community, and gave rise to what we know today as the "Periodic Table", in which the elements are arranged in horizontal rows, according to the growing atomic masses, and also in vertical columns, with elements of similar properties. With Mendeleev's Periodic Table of Chemical Elements, some questions about the constitution of our material universe began to be answered by chemists, as were the simple substances that constituted it. Through the periodic table, one can be sure for the first time that matter was not made up of a single element. Therefore, the table confirmed suspicions and helped the chemists to mark their searches.

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).