test bank for General Chemistry 10th Edition by Darrell Ebbing All chapters 1-24||Complete A+ Guide

,Chapter62162-62Chemistry62and62Measurement

1. What62is62a62scientific62theory?
A) It62is62a62collection62of62experimental62data.
B) It62is62an62assertion62of62scientific62fact.
C) It62is62a62guess62or62conjecture62about62natural62phenomena.
D) It62is62a62fundamental62relationship62of62nature.
E) It62is62an62explanation62of62natural62phenomena62that62has62undergone62significant62testing.
ANS:6 2 6 2 E PTS: 1 DIF: easy REF: 1.2
OBJ: Understand62how62the62scientific62method62is62an62approach62to62performing62science.
TOP: general62concepts62|62scientific62method MSC:6 2 general62chemistry

2. An62untested62explanation62of62a62series62of62experimental62observations62is62called62 .
A) a62hypothesis
B) a62theory
C) a62law
D) an62experiment
E) the62scientific62method
ANS:6 2 6 2 A PTS: 1 DIF: easy REF: 1.2
OBJ:
Understand62how62the62scientific62method62is62an62approach62to62performing
62science.62TOP: general62concepts62|62scientific62method

3. Which62of62the62following62statements62concerning62experiment62and62explanation62is/are62true?
1. A62law62is62always62given62in62the62form62of62a62mathematical62expression.
2. Once62a62hypothesis62passes62one62or62two62tests62it62is62considered62a62theory.
3. Observation62is62a62key62component62of62the62scientific62method.

A) 162only
B) 262only
C) 362only
D) 162and622
E) 1,622,62and623
ANS:6 2 6 2 C PTS: 1 DIF: easy REF: 1.2
OBJ:
Understand62how62the62scientific62method62is62an62approach62to62performing
62science.62TOP: general62concepts62|62scientific62method

4. A62saline62solution62similar62to62that62used62for62intravenous62drips62is62made62by62dissolvi
ng620.4562g62sodium62chloride62in6250.0062g62water.6 2 Which62of62the62following62stateme
nts62concerning62the62saline62solution62and62the62law62of62conservation62of62mass62is/are62c
orrect?
1. The62mass62of62the62saline62solution62is62greater62than62the62mass62of62water.
2. The62mass62of62the62saline62solution62is62equal62to62the62combined62mass
62of62sodium62chloride62and62water.
3. The62mass62of62the62saline62solution62is62greater62than62the62mass62of6
2the62sodium62chloride.

, A) 162only
B) 262only
C) 362only
D) 162and622
E) 1,622,62and623
ANS:6 2 6 2 D PTS: 1 DIF: easy REF: 1.3
OBJ:
Apply62the62law62of62the62conservation62of
62mass.62TOP: general62concepts62|62matter

5. A6219.0-
g62sample62of62lithium62is62completely62burned62in62air62to62form62lithium62oxide.62The62
mass62of62lithium62oxide62must62be
A) less62than6219.062g.
B) greater62than6219.062g.
C) equal62to6219.062g.
D) all62of62the62above.
E) none62of62the62above.
ANS:6 2 6 2 B PTS: 1 DIF: easy REF: 1.3
OBJ:
Apply62the62law62of62the62conservation62of62mass.62(Exam
ple621.1)62TOP: general62concepts62|62matter

6. A62sample62of62silicon62is62burned62in62oxygen62to62form62silicon62dioxide.
What62mass62of62oxyge
n62is62consumed62if6257.7662g62silicon62dioxide62is62formed62from6227.0062g62silicon?
A) 30.7662g
B) 84.7662g
C) 1559.5962g
D) 0.4762g
E) none62of62the62above.
ANS:6 2 6 2 A PTS: 1 DIF: easy REF: 1.3
OBJ:
Apply62the62law62of62the62conservation62of
62mass.62TOP: general62concepts62|62matter

7. In62a62certain62chemical62reaction,627.2962g62of62compound62A62is62added62to625.7062g62o
f62compound62B.62Once62the62reaction62is62complete,623.6062g62of62compound62A62and621
.1762g62of62compound62B62remain.62What62mass62of62products62was62produced?
A) 17.7662g
B) 4.5362g
C) 8.2262g
D) 3.6962g
E) 4.7762g
ANS:6 2 6 2 C PTS: 1 DIF: easy REF: 1.3
OBJ: Apply62the62law62of62the62conservation62of62mass.62(Example621.1)
TOP: general62concepts62|62matter
KEY:6 2 Law62of62Conservation62of62Mass62MSC:6 2 general62chemistry

8. A625.7762g62sample62of62calcium62carbonate62completely62decomposes62into62calcium62oxide
62(lime)62and62carbon62dioxide62gas62when62heated.6 2 If623.2362g62calcium62oxide62is62prod

, uced,62what62mass62of62carbon62dioxide62must62have62been62formed?