Chin
Yuki
2207
-
1713
5653
APPLY YOUR KNOWLEDGE
1. Classify each of the following as Element (E), Compound (C), Heterogeneous mixtures
(HT), Homogenous Mixture (HM)
a)
b)
c)
d)
Silver nitrate C
raisin bread HT
fresh milk HM
baby oil HM
e)
f)
g)
h)
coconut shake HT
gold F- (Aurum )
smoke exhaust HT
Air HM
i)
j)
k)
l)
saltwater HT
tossed salad HT
cream cheese HT / HM
diamond F- Carbon)
2. Base on the properties of calcium carbide (a ripening agent for mangoes) in table below,
identify the physical properties and chemical properties.
♦ is odourless pp
♦ Melts at 2160 °C pp
♦ greyish-white in colour pp
♦ Has a density of 2.22 g/cm3 pp
♦ one mole of calcium carbide has a mass of 64.10g pp
♦ react with water to produce acetylene and calcium hydroxide CP
♦ react with nitrogen to produce calcium cyanide and carbon CP
3. Identify each of the following scenario as a physical change or chemical change
Scenario
Change
iron metal rusts
Chemical
Change
magnesium metal gives off a bright light when it burns
Chemical
Change
mixing baking soda and vinegar produces a gas
Chemical
Change
Frost forms as the temperature drops on a humid winter
night
Perspiration evaporates when you relax after jogging
Physical
change
Physical
change
A cornstalk grows from a seed that is watered and fertilized
chemical
change
sugar dissolves in water
Physical
change
All digits
in
a
measurement are
significant except zeroes used
only to position the decimal point
,
Zeroes that
significant
before
or
point
as
,
,
end
a
whether
number are
they
occur
u
after the decimal
as a decimal
point
long
present
If no decimal point is present
zeroes at the end of the
is
.
,
number
are
not
4. What are the rules for significant figures? Explain c5. Identify the measurement of these objects to the correct number of significant figures by
using metric ruler.
a) your own smartphone (width) 7.9cm
c) 50 cents coin (diameter) 2.3cm
b) A4 paper (length) 29.7cm
CHAPTER 1; MATTER & MEASUREMENTS
.
significant
.
6. Rewrite the following numbers using scientific notation
-5cmx 10-5
a) 0.000097254 m = 9.7254×10
4.0087
b) 438 965 889 399 s
= 4. 3897×10
6.2 xs 102
c) USD 1 089 720 = USD 1.089×106
d) Population of urban people in Brunei, 351 873 =43.519×105
x 105 people
e) average distance from the Earth to the Moon, 383,000,000 m = 3.83
"
✗
108m
7. Please read each instrument to their limits. Include units and correct number of
Significance Figures.
a)
85.7 %
85.5 Trans
b)
c)
7.35mL
7.5mm
8. Explain the observation of the following experiments (accuracy , precision & error)
Not
Accurate
Systematic
accurate
Error
Systematic
Accurate
Not
Precise
Precise
error
Precise
Random error
Not Accurate
Not
Precise
Random
error
9. Calculate the answers to the appropriate number of significant figures
a) 669.5 mg -31.444 mg = 638.1mg
d) 12.3652 m x 12.78 m / 1.057 cm = 14950m
0.9033781m
b) 0.0022099 m + 0.9011682 m =
e) 0.002683 x 0.033 = 8.9×10-5
c) 9568.5 kg/3.95 m3 = 2420kg / m3
CHAPTER 1; MATTER & MEASUREMENTS
67.0g
1mL
10. Convert the;
-14.7mL 4.56g
a) What is the density of an object that has a mass of 67.0 g and a volume of 14.7 mL?
b) A child has a body temperature of 38.7°C, and normal body temperature is 98.6°F. Does
the child have a fever? What is the child’s temperature in kelvins? 38.7°C 311.85K
'
=
Normal
body temperature
is 98.6°F
Yes , the child had fever due
=
37°C
above
to
the
normal
temperature
.
11. The gasoline in an automobile gas tank has a mass of 60.0kg and a density of 0.752 g/cm3.
Identify the volume in cm3. 0.06g
104cm}
075255mi
=
7-98
✗
12. To wire your stereo equipment, you need 325 centimeters (cm) of speaker wire that sells for
$0.15/ft. What is the price of the wire? $-1.60
13. A prescription medication requires 0.00225 g per pound of body weight. Convert this
quantity to the number of mg required per kg of body weight and identify the correct dose
(in mg) per 80kg patient. 4.96×10-6 mg 1kg
3.969×10-4 my
,
14. Oil of wintergreen is a colorless liquid used as a flavoring. A 28.1-g sample of oil of
wintergreen has a volume of 23.7 mL. What is the density of oil of wintergreen?
??÷<
=L
-1991mL
15. The speed limit on many highways in Malaysia 90km/hr. convert this speed into;
a) mph 55.926 mph
c) m/day 2-16×106 ml day
1. 063×109 ft / 5
b) ft/s
d) yd/min 1640 -4yd / min
12
.
325cm
(325×2.5--4) in
=
=
=
=
13
0,0%25-9
.
(0-00225×10-3) my
12795in
( 14¥ )
feet
=
10.66 feet
Price of wire
=
10.60
=
$1.60
✗
$0.15
=
4.96×10-6
pose for
mg / kg
80kg patient (80×4.96) my
-_
=
CHAPTER 1; MATTER & MEASUREMENTS
3.969×10
-4mg