ZChem

Which of the following statements is not an observation?

• There are two hydrogen atoms and an oxygen atom in a water molecule

• The earth is the third planet of our solar system

• The universe might have begun with a Big Bang explosion which took place approximately 15 billion years ago

• In a total absence of water, plants cannot survive

Which one of the following is not one of the seven basic SI units?

• Mass

• Volume

• Time

• Mole

The basic unit for amount of substance is

• Mole

• Liter

• Kilogram

• Gram

A picometer is

• Greater than a micrometer

• Equal to micrometer

• Less than a micrometer

• Twice as large as a micrometer

Which of the following units would best describe the distance between two asteroids that are 8 deca hecto kilo miles apart?

• Gigamile

• Teramile

• Macromile

• Megamile

Which of the following cannot be an exact number?

• Three eggs

• 12 mL of water measured in a 20-mL cylinder

• 12 roses

• 2400 air flights

Which of the following is the estimated error for 12.3008 g of sugar?

• +/- .001

• +/- .0001

• +/- .0008

• +/- .00001

Which number has the greatest uncertainty?

• 1.02 +/- .01

• 4.60 +/- .01

• 100.0 +/- 10.00

• 1.00 +/- 0

Round 20.589958 to 4, 3, and 2 significant figures

• 20.59, 20.5, 20

• 20.58, 20.5, 20

• 20.60, 20.6, 21

• 20.59, 20.6, 21

The solution to (22.41+.464)*(999)/(18.465) is

• 1237.32

• 1.24 x 10³

• 1.2 x 10⁴

• 1237