Grade 10 IEB - Physical Sciences Paper 2 (Chemistry) Summary

Chapter 2 : Matters and Materials

Gasifying Matter




Pure Substances
A single substance or compound
↳2 main Elements and Compounds
groups
:




Elements

Pure substance that cannot be broken down



compounds
of elements bonded fixed chemical
Made
up 2 or more in a ratio
by a reaction



Mixtures

Impure substances :
2 or more different substances
physically blended

Uniform (
Homogeneous :
phase)
same


uniform ( different phases)
Heterogeneous :
Non -




Checking purity of substance


Melting point of pure substance is constant



Impure substances melt at
range
of temps

, Metals

Left side of periodic table ( Group 3-12 :
Transition Metals )




Physical properties :




Shiny
•




High density
•




High melting point
•




Chemically reactive metals
•

Burn in
oxygen
•

Release Oz when react w/ acid



Non -
Metals

Proper
.tiYoj density
•
will shatter if broken
conductor
Only carbon
graphite is
good
•
as

•
Some
gases
are


•
Oz reacts w/ non - metals to form acidic oxides .




Metalloids

Similar to metals and non - metals


proper
.tieng
•
Dense
•
Dont react w/ acid
•
Resistance decrease when temp increases