Chemistry and Physics Quiz

The number with the most significant zeros is ________.

• 250000001

• 2.5100000

• 0.02500001

• 2.501 × 10-7

• 0.00002510

How many significant figures should be retained in the result of the following calculation? 12.00000 × 0.9893 + 13.00335 × 0.0107

• 2

• 3

• 4

• 5

• 6

In which one of the following numbers are all of the zeros significant?

• 0.0001

• 0.1

• 0.143290

• 0.0010

• 100.090090

Which of the following is not an exact number?

• the number of grams in a kilogram

• the number of liters in a gallon

• the number of seconds in a year

• the number of centimeters in an inch

• the number of millimeters in a kilometer

Round the number 0.007222 to three significant figures.

• 0.007225

• 0.0072

• 0.00723

• 0.007

• 0.00722

Round the number 3456.5 to two significant figures.

• 3400

• 3400.0

• 3000.0

• 3000

• 3500

Solids have a ________ shape and are ________.

• definite, incompressible

• definite, compressible

• indefinite, compressible

• indefinite, incompressible

• sharp, convertible

________ is the chemical symbol for elemental sodium.

• S

• Na

• So

• W

• Sn

If matter is uniform throughout and cannot be separated into other substances by physical processes, but can be decomposed into other substances by chemical processes, it is called a(n) ________.

• compound

• element

• homogeneous mixture

• heterogeneous mixture

• mixture of elements

A separation process that depends on differing abilities of substances to form gases is called ________.

• filtration

• solvation

• chromatography

• distillation

• All of the above are correct.