2.1

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1.
matter
2.
mixture
3.
homogeneous
4.
heterogeneous
5.
compound
6.
substance
7.
element
8.
colour
9.
melting
10.
boiling
11.
density
12.
hardness
13.
ductility
14.
viscosity
15.
malleability
16.
lustre
17.
flammability
18.
corrosion
19.
odour
20.
temperature
21.
precipitate
22.
solid
23.
liquid
24.
gas
25.
energy
26.
vibration
27.
particles
28.
pressure
29.
reversible
30.
state