Which of the following is/are heterogeneous mixtures?

1
Which of the following is/are heterogeneous
mixtures? Gasoline Tea Italian salad
dressing White wine Vinegar Beach sand Dirt
2
Which of the following is/are heterogeneous
mixtures? Italian salad dressing, Beach sand,
Dirt The rest are solutions.
3
Which of the following processes do not represent
chemical changes? Iron rusting Distillation of a
liquid Reaction of sodium metal with water Leaves
changing color Dissolving sugar in
water Filtration of a solid from a liquid
4
Which of the following processes do not represent
chemical changes? Distillation of a liquid,
Dissolving sugar in water, Filtration of a solid
from a liquid are physical changes. Iron
rusting, Reaction of sodium metal with water,
Leaves changing color are chemical changes.
5
Which of the following do not represent physical
properties? Boiling point Color Reaction with
oxygen Conductivity of gold Burning of gasoline
6
Which of the following do not represent physical
properties? Reaction with oxygen , Burning of
gasoline are chemical properties Boiling point,
Color, Conductivity of gold are physical
properties
7
Which of the following is/are compounds? Distilled
water Iron Milk Air Table salt Aspirin tablets
8
Which of the following is/are compounds? Distilled
water, Table salt are compounds Iron is an
element Milk, Air, Aspirin tablets are mixtures
9
How many ?g are there in 0.0134g?
10
How many ?g are there in 0.0134g? 1g 106
?g 0.0134g x (1x106 ?g/1g) 13,400?g Or 1.34x104
?g
11
Which metric prefix would replace the power of
ten in 3.68x10-3m?
12
Which metric prefix would replace the power of
ten in 3.68x10-3m? 10-3 is refers to milli, so
the number would be 3.68millimeters.
13
Can a set of measurements be precise without
being accurate? Can the average of a set of
measurements be accurate even if the individual
measurements are imprecise?
14
Can a set of measurements be precise without
being accurate? Can the average of a set of
measurements be accurate even if the individual
measurements are imprecise? Yes, data
measurements may be close to one another
(precise) but not be close to the accepted value.
This type of error usually occurs from a
miscalibrated instrument. Yes, if the average of
the imprecise measurements happens to be close to
the accepted, published value. This is not an
acceptable way of data collection however.
15
Use exponential notation to express each of the
following measurements in terms of SI base
units. 1.09ng 90.1ms 145pm
16
Use exponential notation to express each of the
following measurements in terms of SI base
units. 1.09ng x (1kg/1x1012ng)
1.09x10-12kg 90.1ms x (1s/1x103ms)
9.01x10-2s 145pm x (1m/1x1012pm) 1.45x10-10m
17
Ray Bradbury chose Fahrenheit 451 as the title
of his novel about book burning in a future
society. A firefighter told him that is the
temperature at which paper ignites. What would
his title have been had be been given the
temperature in degrees Celsius?
18
Ray Bradbury chose Fahrenheit 451 as the title
of his novel about book burning in a future
society. A firefighter told him that is the
temperature at which paper ignites. What would
his title have been had be been given the
temperature in degrees Celsius? oC (5/9)(451oF
32) 233oC
19
The highest temperature ever recorded in Phoenix,
Arizona was 50.0oC. Express this in oF?
20
The highest temperature ever recorded in Phoenix,
Arizona was 50.0oC. Express this in oF? oF
(9/5) 50.0oC 32 122oF
21
Determine the number of L in a box that measures
4cm x 8cm x 10cm.
22
Determine the number of L in a box that measures
4cm x 8cm x 10cm. 4cm x 8cm x 10cm 320cm3
(raw data) 3x102cm3 based on round-off
rules. 3x102mL x (1L/1,000mL) .3L 3x10-1L
23
Determine the number of significant digits in the
following numbers 2.3000x106 45.1 800000.103 .000
000001500 600 500.
24
Determine the number of significant digits in the
following numbers 2.3000x106 (5) 45.1 (3)
800000.103 (9) .000000001500 (4) 600 (1)
500. (3)
25
A bathroom-type scale is calibrated (marked off)
in tenths of a kilogram from 1 to 200kg.
Determine how many significant figures should be
used to express the mass of anyone using the
scale whose mass is between 10 and 99kg.
26
A bathroom-type scale is calibrated (marked off)
in tenths of a kilogram from 1 to 200kg.
Determine how many significant figures should be
used to express the mass of anyone using the
scale whose mass is between 10 and 99kg. 4
digits are allowed. If the scale is calibrated
in tenths, then it is the 100ths place that is
uncertain. Based on the allowed digit of
uncertainty, this gives a total of four. For
example 25.46kg
27
How many significant figures does the result of
the following operation contain? 8.5201 1.93
28
How many significant figures does the result of
the following operation contain? 8.5201
1.93 This is addition, and therefore depends on
the least number of digits after the decimal
point. Since 1.93 only has two, the raw result
from the calculator (10.4501) is reported as
10.45.
29
If a car has an EPA mileage rating of 30 miles
per gallon, what is this rating in km/L?
30
If a car has an EPA mileage rating of 30 miles
per gallon, what is this rating in km/L? 30mi/gal
(1.609km/1mi)(1gal/4qt)(1.057qt/1L) 12.755
13km/L
31
An aluminum beverage can contains 12 fluid
ounces. Express this volume in microliters,
given 1 fl. oz. 29.6mL
32
An aluminum beverage can contains 12 fluid
ounces. Express this volume in microliters,
given 1 fl. oz. 29.6mL 12oz. (29.6mL/1oz.)(103?L
/1mL) 3.6x105?L
33
Magnesium (Mg) and iron (Fe) have densities of
1.7g/cm3 and 7.9g/cm3 respectively. If a sample
of iron has a mass of 826g, what is the mass of a
block of magnesium that has the same volume as
the block of iron?
34
Magnesium (Mg) and iron (Fe) have densities of
1.7g/cm3 and 7.9g/cm3 respectively. If a sample
of iron has a mass of 826g, what is the mass of a
block of magnesium that has the same volume as
the block of iron? The mass of Mg needed is 826g
(1.7g/cm3 / 7.9g/cm3) 177.75 1.8x102g
35
An irregularly shaped piece of metal with a mass
of 125g is placed into a graduated cylinder that
contains 25.00mL of water. This raises the water
level to 56.00mL. What is the density of the
metal?
36
An irregularly shaped piece of metal with a mass
of 125g is placed into a graduated cylinder that
contains 25.00mL of water. This raises the water
level to 56.00mL. What is the density of the
metal? 125g / (56.00mL 25.00mL) 4.03g/mL
37
A student performs a density experiment and
achieves the following results 2.33g/mL 2.32g/mL
2.31g/mL The published value for the density of
the object is 2.65g/mL. Comment on the accuracy
and precision of the experiment.
38
A student performs a density experiment and
achieves the following results 2.33g/mL 2.32g/mL
2.31g/mL The published value for the density of
the object is 2.65g/mL. Comment on the accuracy
and precision of the experiment. The data results
are reasonably precise, but not very accurate.
39
Perform the following conversions to the correct
number of significant digits 642g _____kg2.6
5m3 _____cm368.4in _____cm94ft _____m
1.2lb _____g248lb _____kg1.85gal ___
__L
40
Perform the following conversions to the correct
number of significant digits 642g(1kg/1,000g)
.642kg2.65m3(106cm3/1m3) 2.65x106cm368.4in (
2.54cm/1in) 174cm94ft(1m/3.281ft) 29m1.2l
b(453.6g/1lb) 5.4x102g248lb(.4536kg/1lb) 1
12kg1.85gal(1L/.2643gal) 7.00L
41
A fertilizer contains 21 nitrogen by mass. What
mass of this fertilizer, in kilograms, is
required for an application of 775g of nitrogen?
42
A fertilizer contains 21 nitrogen by mass. What
mass of this fertilizer, in kilograms, is
required for an application of 775g of
nitrogen? 775g .775kg .775kg .21x x 3.7kg
of nitrogen (to the correct number of significant
digits)
43
Calculate the mass of a block of iron (density
7.86g/cm3) with dimensions of 52.8cm x 6.74cm x
3.73cm.
44
Calculate the mass of a block of iron (density
7.86g/cm3) with dimensions of 52.8cm x 6.74cm x
3.73cm. D m/V m DV (7.86g/cm3)(52.8cm x
6.74cm x 3.73cm) 1.04x104g
45
Perform the following calculations express each
number and the answer in exponential form with
the appropriate number of significant
figures. a. b. c. d.
46
Perform the following calculations express each
number and the answer in exponential form with
the appropriate number of significant figures. a.
99,600 1.0x105 b. 1.01297 1.0x100 c.
.4461 4.46x10-1 d. .5768 5.77x10-1
47
You decide to establish a new temperature scale
on which the melting point of mercury (-38.9oC)
is 0oM and the boiling point of mercury (356.9oC)
is 100oM. What would be the boiling point of
water in degrees M? The temperature of absolute
zero in degrees M?
48
You decide to establish a new temperature scale
on which the melting point of mercury (-38.9oC)
is 0oM and the boiling point of mercury (356.9oC)
is 100oM. What would be the boiling point of
water in degrees M? The temperature of absolute
zero in degrees M? The ratio of the two
temperature scales are (356.9oC-
-38.9oC)/(100oM-0oM) 1oM3.958oC In addition,
the zero point on the M scale -38.9oC.
Therefore, oC 3.958oM -38.9 BP H2O 100oC
35.1oM Ab. Zero -273.15oC -59.2oM
49
The volume of a red blood cell is about
9.00x10-11cm3. Assuming that red blood cells are
spherical, what is the diameter of a red blood
cell in inches?
50
The volume of a red blood cell is about
9.00x10-11cm3. Assuming that red blood cells are
spherical, what is the diameter of a red blood
cell in inches? V 4/3 ?r3 for a sphere Diameter
2r r (3V/4?)1/3 2.78x10-4cm Diameter
2.78x10-4 x 2 5.56x10-4cm 5.56x10-4cm x
(1in/2.54cm) 2.19x10-4in