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Changing Density Units

By Janice VanCleave

Density is a type of conversion factor that compares the mass of a specific volume. The basic metric unit for mass is gram, g.The basic metric unit for length is meter, m.The basic metric unit for volume is L or m 3. Use the density of calcium, Ca, found at Dynamic Periodic TableConvert the units of […]

Filed Under: Chemistry Tagged With: conversion factor, density

How Many Atoms in A Mole?

By Janice VanCleave

A drawing of a mole is shown to clarify that in chemistry a mole is not an animal.

A chemical mole is not an animal.  A chemical mole is a unit of measuring the amount of chemical substances. For the problem shown, use this mole conversion factor: 1 mole = 6.o2 x 10 23 atoms The number 6.o2 x 10 23 is called Avagadro’s Number  Calculate:  4.2 x 10 26 atoms of lithium (Li) are equal to how many […]

Filed Under: Chemistry Tagged With: atom, conversion factor, dimensional analysis, moles

What is a Mole?

By Janice VanCleave

A mole is a chemical unit of measure. Dimensional analysis is a method used to convert one  unit of measurement to another. Conversion factors are mathematical tools for converting between units of measurement. The conversion factor 1 ft = 12 inches is used to convert units of feet to units of inches or vise versa. Example: How many […]

Filed Under: Chemistry Tagged With: Avogadro's number, conversion factor, dimensional analysis, mole

Salt Flats

By Janice VanCleave

Salt flats are usually flat, as their name implies. One salt flat that doesn’t adhere to this description is “The Devil’s Golf Course” in Death Valley National Park.  This salt flat  was once a lake. As the water evaporated, the minerals that were dissolved in the lake water were left behind. Since the surface remains […]

Filed Under: Earth Science Tagged With: conversion factor

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The spoon hanging from the string vibrates when struck and these vibrations are transmitted through the string and the sound is amplified by the plastic cups. ABOUT ME: Hi, I am Janice VanCleave, author of 50 best-selling science experiment books for children ages 4 through high school. I taught science for 27 years. MORE.....

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