Question

1.A__ is the substance that cannot be split into simpler substances.
2. There are elements known till date & are found in nature.
3.__&_are eg. Of elements
4. The ___ is the smallest particle of an element.
5.Atoms can be seen with the help of
6. A_ is formed by 2 or more elements, chemically combined in
fixed ratio.
7. The scientific name of common salt is _- & symbolis
8.A__ is the smallest part of an element Or compound that can exist
itself.
9. A compound can be broken down into its constituents elements by
_method.
10.Properties of are different from their constituents elements
11.In a_, 2 or more substances are mixed together in any ratio.
12.A is a short form used to represent an element.
13.A of a compound tells us which element have combined to form
the compound.
14. The is the combining capacity of the element.
15.The is the no. of atoms in a molecule of an atom.
are
16. are substances that undergo a chemical reaction &
formed as the result of chemical reaction.
17. A chemical reaction is represented by
18. is the process of separating a solid from its solution as
crystals.
&
19. common salt is obtained from sae water by
20.CChemical changes are generally _ while physical changes are
that is formed from a liquid.​

Answer 1

Answer:

1. Molecule
2. 118
3. Copper and Sodium
4. Atom
5. Electron microscope
6. Compound
7. Sodium Chloride (NaCl)
8. Molecule
9. chemical reaction
10. Compound
11. Mixture
12. Symbol
13. formula
14. valency
15. Different
16. Compound
17. Chemical equations
18. crystallization
19. Evaporation
20. exothermic, indothermic