Exact numbers have an unlimited number of significant figures.

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

Select the unit that is NOT an energy unit.

Determine the answer for the equation below with correct number of significant figures: 3.215 x 13.2 ÷{“version”:”1.1″,”math”:”÷”} 0.218 = __________

How many protons and electrons are present in the ion O2-?

The distance between the two hydrogen atoms in a molecule of water is 0.000 000 000 172 m. Express this distance in scientific notation.

In multiplication or division calculations, the answer will have the same number of decimal places as the number in the problem carrying the most decimal places.

Suppose a thermometer has marks at every one degree increment (it is divided into ones), 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:

Theories are explanations; laws are descriptions.

How many cm3 are there in 2.5 m3?