CHEM 121 FINAL EXAM | UPDATED QUESTIONS AND ANSWERS UPDATED .Buy Quality Materials!
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Course
CHEM 121
Institution
CHEM 121
CHEM 121 FINAL EXAM | UPDATED QUESTIONS AND ANSWERS UPDATED .Buy Quality Materials!
Matter
anything that has mass and occupies space
Elements
chemical substance that cannot be broken down into other substances
Compounds
made up of two or more different chemical elements
Mixtures
combine t...
CHEM 121 FINAL EXAM | UPDATED QUESTIONS AND
ANSWERS UPDATED .Buy Quality Materials!
Matter
anything that has mass and occupies space
Elements
chemical substance that cannot be broken down into other substances
Compounds
made up of two or more different chemical elements
Mixtures
combine two substances in such a way that no chemical reaction occurs
Physical Prperties
can be determined without changing the composition of substances
chemical properties
Describe the way a substance undergoeschange (or resists change) to form a
newsubstance.
chemical change
the original substance is converted into anew substance, which has different physical &
chemical properties
Physical change
Simple change in state(may be easily reversed)
• No new substances formed
• Composition has not changed
Homogeneous
2 or more substances in one phase
Heterogeneous
2 or more substances in 2 or more phases
Atomic number
The number of protons in an atom
Mass number
The number of protons and neutrons in an atom p+n
Isotopic notation
Shows the symbol, mass number and atomic number of a particular isotope of an
element
Atomic Mass
Weighted average of masses of all naturally occurring isotopes of an element
Metal
- solid
- luster
-ductile
- malleable
-conduct heat and electricity
- high melting points
- high densities
- form cations
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