CHAPTER 1/2 Cumulative REVIEW Name: __________________________ Date: ___________ Color __________

```CHAPTER 1/2 Cumulative REVIEW
Name: __________________________
Date: ___________ Color __________
1. Record the measurements from the following instruments to the correct number of
digits with the correct unit.
a. BALANCE
Cylinder
105.055 g
4.35 ml
Cylinder
d.
Lab
Thermometer
35.0 ml
-0.70 ˚C
2. Record the number of significant digits in each of the following:
2500
2
0.157
3
2500.
4
0.002300
4
43.07
4
6.751
4
3. Convert between regular and scientific notation with correct significant digits:
2.22 x 10-4
.000222
5.47 x 103
5470
66,000
6.6 x 104
.089
8.9 x 10-2
4. Convert between Celsius and Kelvin temperature scales with correct significant digits:
290. K =
17
C
127 K =
-146 C
392 C = 665 K
-157 C =
116 K
5. Use conversion factors to solve the following. Answer with correct sig digits &amp; unit:
72 ft (12 in)
1 ft
72 feet to inches
350. cm to meters
350. cm
25 km to centimeters 25
(1 meter)
100 cm
= 860 in
=
(2 sig)
3.50 m (3 sig)
km (1,000 meter)(100 cm) = 2,500,000 cm
1 km
1m
(2 sig)
6. A block of aluminum has a mass of 36.40 g and a volume of 13.5 cm3. What is its density?
D = m/v
D = 36.40 g / 13.5 cm3
= 2.70 g/ cm3
(3 sig)
7. What is the volume of 227 g of olive oil if its density is 0.92 g/mL.
D = m/v, so v = m/D
v = 227 g/ 0.92 g/ml v = 250 ml
(2 sig)
8. Define accuracy close
to correct answer &amp; precision repeatable results,
numbers close together to a certain # of places.
9.
MASS OF SAMPLE
Team 1
Team 2
Team 3
41.04 g
31.33 g
42.34 g
39.77 g
31.30 g
41.12 g
43.15 g
31.36 g
41.21 g
Average
41.32 g
31.33 g
41.55 g
Accepted measure from issuing lab: 41.33 g
Percent error
0.02%
24.2%
0.53%
Which team is most accurate? Team 1 Least accurate? Team 2
Which team is most precise? Team 2 Least precise? Team 1
Which team has the best accuracy and precision? Team 3
10. Label the phases, phase changes, and freezing/boiling temperatures on the heating/cooling curve
for water. What is happening to kinetic energy during section A? increasing What is happening to
kinetic energy during section E/F? staying same
Vaporization
100˚C
Vapor
Condensation
Melting
0˚C
Liquid
Freezing
SOLID
11. Pure substances are either elements or compounds. Mixtures may be either
Heterogeneous
mixtures are:
or
homogeneous.
Three types of homogeneous
solutions (clear &amp; uniform), colloids (cloudy &amp; uniform) and alloys
(opaque, uniform blend of metals). At first glance a colloid &amp; suspension may look similar. The
difference is
suspensions will precipitate (separate), colloids will not.
12. Classify the following as element (E), compound (C), solution (S), alloy (A), colloid (CL)
or suspension (SP).
E
CL
gold
C
water
A
milk
S
salt/water
C
E
brass
carbon dioxide
carbon
CL
whipped cream
A gold jewelry
SP
sand/water
13. Physical properties can be measured without changing the chemical composition of a
substance.
Chemical properties describe chemical reactions a substance will/will not undergo.
Classify the following as physical (P) or chemical (C) properties:
P color
C
tendency to rust
P
mass
C
noble gases are inert
P
C
reactivity with oxygen
C
flammability
P
density
boiling point
14. Physical changes change the appearance, but not the chemical composition of a substance.
Chemical changes (chemical reactions) create new substances.
Classify the following as physical (P) or chemical (C) changes:
P
melting iron
C
burning gasoline
P
breaking test tube
C
wood rotting
P
dissolving NaCl
C
reacting Mg w HCl
P
boiling water
C
iron rusting
15. What are the four signs of a chemical change?
change in temperature
change in color
production of a gas
formation of precipitate
16. A student experimentally determined the density of a piece of aluminum to be 2.95 g/cm 3.
The accepted value for aluminum density is 2.70 g/cm3. Calculate the student’s percent error.
2.95 g/ cm3 - 2.70 g/cm3
2.70 g/cm3
x 100 % = .25 x 100 % = .093 x 100%
2.70
9.3% (2 sig)
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