CHEM 103 Exam 1 | General Chemistry Practice Questions & Study Guide

Chem../103../Exam../1


What../is../chemistry?../-
../correct../answer../Chemistry../is../the../study../of../the../physical../and../compositio


nal../changes../of../matter.


Chemistry../is../called../the../Central../Science.
../




Many../health../related../areas../of../study../are../based../on../Chemistry.
../




Matter../-
../correct../answer../Matter../is../anything../that../has../mass,../occupies../space../and../i


s../made-up../of../atoms../or../parts../of../atoms.


Mass../-../correct../answer../-
Mass../is../a../measure../of../the../amount../of../matter../in../an../object.
-Mass../is../independent../of../the../location../of../an../object.
-
An../object../on../the../earth../has../the../same../mass../as../the../same../object../on../the../m
oon,../but../not../same../weight.


Weight../-../correct../answer../-
Weight../is../a../measure../of../gravitational../force../acting../on../object.

,-Weight../depends../on../the../location../of../an../object.
-Force../=../Mass../*../Acceleration,../F../=../ma,../Wt../=../m(gravity).
-
An../object../weighing../1.0../lb../on../earth,../weighs../about../0.17../lb../on../the../moon
.../Mass../of../object../is../constant.../Moon../has../1/6../gravity../of../earth,../which../red
uces../apparent../weight../of../object.


Physical../Properties../of../Matter../-../correct../answer../-
Physical../properties../can../be../observed../or../measured../without../changing../the..
/composition../of../the../matter../being../observed.




Examples../of../physical../properties../are:../color,../shape../and../mass,../and../all../ch
anges../of../state../like../gas../to../a../liquid.


Chemical../Properties../of../Matter../-../correct../answer../-
Chemical../properties../can../be../observed../or../measured../only../when../the../comp
osition../of../matter../is../changed.


Examples../of../chemical../properties../are../flammability../and../the../ability../to../re
act../(e.g.../when../vinegar../and../baking../soda../are../mixed).../Atoms../must../chang
e../partners.


Physical../changes../of../Matter../-../correct../answer../-
Physical../changes../are../reversible.

, -
Physical../changes../take../place../without../a../change../in../composition.../Atoms../a
re../not../changing../partners.
-Nothing../new../is../being../created.
Examples../of../physical../changes../are../freezing,../melting,../or../evaporation../of../
a../substance../(e.g.../water).../H2O(s)../→../H2O(l),../ice../→../water.
Separation../of../compounds../is../a../physical../change.
ex/../separating../iron../filing../from../sand../is../a../chemical../reaction


Chemical../Changes../of../matter../-../correct../answer../-
Chemical../changes../are../not../always../reversible.
-
Chemical../changes../are../always../accompanied../by../a../change../in../compositio
n.../Atoms../are../changing../partners.
-New../types../of../matter../are../being../created,../O2../+../2H2../→../2H2O
Examples../of../chemical../changes../are../the../burning../of../paper../and../the../fizzin
g../of../a../mixture../of../vinegar../and../baking../soda.


Democritus../(Greek,../460-370../BC)../-
../correct../answer../First../person../whose../writings../suggested,../



-based../only../on../logic,../that../atoms../where../the../
../



basis../of../matter.
../



-Atoms../comes../from../the../word../'atomos'../