Question

Name the following
1. Atom present in one molecule of water
2. The symbol of lead element 3.The gas obtained when calcium carbonate is in heat
4. Any material with a specific chemical composition
5. The smallest unit of any chemical element
6.Reaction in which heat is absorbed
7.The simplest unit of a chemical compound
8. The process of forming crystals of solid substances from its solution​

Answer 1

1. atom oxygen (h2o)
2. pb
3. they decomposes to oxides
4. eg: hydrogen fluoride (hf)
5. molecule
6. endothermic
7. covalent molecules
8. crystallization

my dear friend ❣️ this is your answer.....

Answer 2

Answer:

1.H2O

2.Pb

3.Carbon dioxide

4.A chemical substance may well be defined as "any material with a definite chemical composition" in an introductory general chemistry textbook. According to this definition a chemical substance can either be a pure chemical element or a pure chemical compound.

5.Atom

6.endothermic

7.covalent compound

8.Crystallization is the physical transformation of a liquid solution or gas to a crystal which is a solid with an ordered internal arrangement of molecules, ions or atoms.