Exam review 1

Which of the following is an example of an observation?

• All matter is composed of small, indestructible particles called atoms.

• Reactions occur due to the transfer of electrons.

• Flammable objects contain phlogiston.

• When a can of soda pop is opened, a fizzing sound is heard.

• none of the above

Which of the following is considered a hypothesis (as opposed to an observation)?

• Fresh lava from a volcano is hot.

• The Washington Monument is 555 feet tall.

• Spiders have eight legs.

• Birds can fly because they have hollow bones.

• none of the above

The correct scientific notation for the number 0.00070615 is:

• 7.0615 x 10^-4

• 7.0615x 10^4

• 7.0615 x 10^-4

• 7.0615 x 10^4

• none of the above

The correct decimal representation of 1.201 x 10^-7 is:

• 12010000

• 0.0001201

• 1201.000

• 0.000001201

• none of the above

Suppose a thermometer has marks at every one degree increment and the mercury level on the thermometer is exactly between the 25 and 26 degree Celsius marks: We should properly report the temperature measurement as:

• 25.55°C

• 26°C

• 25.50°C

• 25°C

• 25.5°C

In the number 52.94, which digit is estimated?

• 4

• 9

• 5

• 2

• None of the above, all digits are certain.

There are exactly 2.54 centimeters in 1 inch. When using this conversion factor, how many significant figures are you limited to?

• 1

• 3

• ambiguous

• depends on if you are using it in multiplication/division c or addition/subtraction

• infinite number of significant figures

The correct number of significant figures in the number 1.250100 is:

• 7

• 5

• 4

• ambiguous

• none of the above

The correct number of significant figures in the number 0.027090 is:

• 6

• 5

• 7

• ambiguous

• none of the above

The correct number of significant figures in the number 5.020 x 10^4 is:

• 5

• 3

• 4

• ambiguous

• none of the above