Practice questions fundamentals

Question 1

A broad generalization based on the results of many identical experiments is called

a. the scientific method.
b. a scientific law.
c. a theory.
d. a hypothesis.
e. an empirical fact.

Answer 1

b. scientific law

Question 2

Which one of the following does not involve a chemical change?

a. A fish that is left for some time in an unrefrigerated place decomposes.

b. Apple juice which is left in an open bottle ferments.

c. A loaf of bread rises and its volume expands when it is baked in an oven

d. When a lake starts to freeze in winter, ice is formed on the surface.

e. When sugar is fermented under certain conditions, alcohol is produced.

Answer 2

d. When a lake starts to freeze in winter, ice is formed on the surface.

Question 3

Which one of the following is a physical change?

a. When ignited with a match in open air, paper burns.

b. In cold weather, water condenses on the inside surface of single pane windows.

c. When treated with bleach, some dyed fabrics change color.

d. When heated strongly, sugar turns dark brown.

e. Grape juice left in an open unrefrigerated container turns sour.

Answer 3

b. In cold weather, water condenses on the inside surface of single pane windows.

Question 4

The two types of pure substances are

a. compounds and elements.
b. compounds and solutions.
c. elements and mixtures.
d. mixtures and solutions.
e. solutions and elements.

Answer 4

a. compounds and elements.

Question 5

The kilo is

a. a unit of mass.
b. a unit employed in medical terminology.
c. a decimal multiplier in the metric system.
d. a unit of speed.
e. a volume unit employed by the DEA (drug enforcement agency).

Answer 5

c. a decimal multiplier in the metric system.

Question 6

The SI base units of temperature and mass, respectively, are

a. degree and gram.
b. Kelvin and kilogram.
c. Celsius and milligram.
d. degree and kilogram.
e. kelvin and gram.

Answer 6

b. Kelvin and kilogram.

Question 7

The melting point of antimony is listed in one handbook as 630.74 °C. Determine the equivalent value in °F.

		a.	382.41 °F
		b.	1103.3 °F
		c.	1077.7 °F
		d.	1167.3 °F
                    e.	1192.9 °F

Answer 7

d. 1167.3 °F

Question 8

On a day in the summer of 1992, the temperature fell from 98 °F to 75 °F in just three hours. The temperature drop expressed in Celsius degrees (°C) was

		a.	13 °C
		b.	41 °C
		c.	45 °C
		d.	  9 °C
		e.	75 °C

Answer 8

a. 13 °C

Question 9

The melting point of antimony is listed in one handbook as 1167.3 °F. Expressed in kelvins this temperature would be

		a.	357.6 K
		b.	496.8 K
		c.	583.7 K
		d.	894.2 K
		e.	903.9 K

Answer 9

e. 903.9 K

Question 10

The boiling point of carbonyl selenide is 251.4 K. What is this temperature in °F?

		a.	-   7.1 °F
		b.	 44.1 °F
		c.	 96.7 °F
		d.	  0.00 °F
		e.	+18.5 °F

Answer 10

a. - 7.1 °F

Question 11

Which response gives the correct number of significant figures for all three of the following measurements? 7.103 cm, 0.00005 inch, and 1.3400 x 104 dm3

		a.	3, 5, and 4
		b.	3, 1, and 3 
		c.	4, 1, and 3
		d.	4, 1, and 5
		e.	4, 5, and 5

Answer 11

d. 4, 1, and 5

Question 12

How many significant figures should be displayed in the result of the operation, 8.5201 + 1.93?
a. 1
b. 2
c. 3
d. 4
e. 5

Answer 12

d. 4

Question 13

When the expression, 16.0200 + 0.00048 11.184 221.1, is evaluated, the result should be expressed as

		a.	216.3
		b.	216.46
		c.	216.2635
		d.	216.26352
		e.	2.2 x 102

Answer 13

a. 216.3

Question 14

The number 0.02100 is properly expressed in scientific notation as

		a.	0.21 x 10^1
		b.	2.1 x 10^2
		c.	2.100 x 10^-2
		d.	21.0 x 10^3
		e.	2.10 x 10^2

Answer 14

c. 2.100 x 10^-2

Question 15

The SI prefixes giga and micro indicate, respectively:

		a.	10^9 and 10^6 
		b.	10^9 and 10^6
		c.	10^6 and 10^3 
		d.	10^3 and 10^3 
		e.	10^9 and 10^3

Answer 15

a. 10^9 and 10^6

Question 16

The SI prefixes mega and nano indicate, respectively:

		a.	10^9 and 10^6 
		b.	10^6 and 10^9
		c.	10^6 and 10^9 
		d.	10^6 and 10^9 
		e.	10^6 and 10^9

Answer 16

b. 10^6 and 10^9

Question 17

A distance of 18 x 10^-3 meters is equal to

		a.	1.8 micrometers.
		b.	1.8 millimeters.
		c.	0.18 meters.
		d.	1.8 centimeters.
		e.	18 kilometers.

Answer 17

d. 1.8 centimeters.

Question 18

An empty volumetric flask, weighing 27.16 grams, has a volume of 100.4 cm3. How much would it weigh when filled with bromine, an element that has a density of 3.1028 g/cm-3?

		a.	59.51 g
		b.	284.4 g
		c.	311.5 g
		d.	338.7 g
		e.	395.8 g

Answer 18

d. 338.7 g

Question 19

Consider this data from a lab, concerning the mass and the volume of water displaced in a graduated cylinder by introduction of a metal sample to the cylinder:
Mass of weighing cup = 0.452 g
Mass of weighing cup + metal sample = 72.943 g
Volume of water in cylinder = 15.2 cm3
When the metal sample was carefully lowered into the graduated cylinder, the water above the submerged metal sample rose to the 19.0 cm3 mark. What is the density of the metal?

		a.	2.2 g cm-3
		b.	3.8 g cm-3
		c.	4.8 g cm-3
		d.	19 g cm-3
		e.	19.7 g cm-3

Answer 19

d. 19 g cm-3