Prince George’s Community College
CHM1010
Chapter 1: Matter and measurements
Practice problems (during recitation and at home)
1.
What are the SI base units for length, mass, time, temperature, electric
current, and amount of substance?
2.
What is the SI unit for volume of a sphere?
3.
Convert 25°C into °F and Kelvin.
5.
Convert 3.25m into millimeters (mm). (3.25 x 103mm)
6.
How many liters in 1 m3?
8.
A sample of blood completely fills an 8.20cm3 vial. The empty vial has a
4.
7.
Convert -40°C into °F.
How many dm3 in 1 m3?
mass of 10.30g. The vial has a mass of 18.91g after being filled with
blood. What is the density of blood? (1.05 g/mL)
9.
Seawater has a density of about 1.03g/mL. What mass of seawater would
fill a sampling vessel to a volume of 225mL? (232g)
10.
The average speed of a nitrogen molecule in air at 25°C is 315m/s.
Convert this speed into mile per hour. (1.15 x 103 mi/hr)
11.
A cubic object has a density of 19.3g/cm3). What is the mass of 2.00 in.3
cubic object in gram? (633g)
12.
Earth oceans contain approximately 1.36 x 109 km3 of water. Calculate the
volume in liters. (1.36 x 1021L)
13.
A car travels 28mi per gallon of gasoline. How many kilometers per liter
will it go? (12km/L)
14.
If the volume of an object is reported as 5.0ft3. What is the volume in cubic
meters? (0.14m3)
15.
What is the mass in grams of 1.00 gal of water? The density of water is
1.00g/mL. (3.78 x 103g water)
16.
Determine significant numbers in each quantity.
a.
0.0030L
b.
d.
0.00004715m
0.1044G
e.
c.
57600. s
1
53069 mL
f.
500h
17.
Perform the following calculations and round off the result in correct
significant numbers.
18.
20.
a.
(16.3521cm2 – 1.448cm2) ÷ (7.085cm)
b.
(25.65g + 37.4g) ÷ 73.55L (1L/1000mL))
Which of the following is a chemical change?
a.
Boiling canned soup.
b.
toasting a slice of bread.
c.
chopping a log
d.
burning a log.
If it takes 0.75hours to drive a distance of 26.8 miles, what is the average
speed of the car in miles per hour? (36miles)
21.
Convert 80mi/h into km/h. (130km/h)
22.
What is the density of lead sulfide if it has a mass of 12.4g and a volume
of 1.64cm3? (7.56g/cm3)
23.
What is the density of a particular type of plastic if a solid block of it
measures 15.5cm x 4.60cm x 1.75cm and has a mass of 98g? (0.78
g/cm3)
24.
The density of gasoline is 0.70g/mL. What is the mass of a thankful of
gasoline if the tank holds 12.0 gallons? (32kg)
25.
The density of bromine is 3.12g/mL. How many liters are needed to give
1.25pounds of bromine? (0.182L)
26.
What is the mass of 176 cubic inches of iodine if the density of iodine is
4.93g/mL? (14.2kg)
27.
What is the volume of 256.2kg of graphite (density of graphite = 2.25
g/cm3)? (114L)
28.
What is the volume of 54 pounds of water? (24L)
29.
The diameter of a chlorine atom is 0.200nm. How many chlorine atoms
lined up end to end would form a line 1.0 inch long? ((1.3 x 10 8 atoms)
30.
The distance from the earth to the Sun is 9.3 x 107 miles. The speed of
light is 3.00 x 108 m.s-1. How long in minutes does it take light from the sun
to reach us? (8.3 min)
2