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Ch. 5 & Ch. 6 Key Terms

Across
A quantitative observation
International system of units based on the metric system and on units derived from the metric system.
The simplest whole number ratio of atoms in a compound.
The certain digits and the first uncertain digit of a measurement.
Slightly larger than a quart and abbreviated (L).
When several equivalents between the English and metric system stand for exactly the same distance.
What scale or standard is being used to represent the results of the measurement.
A small unit of mass used to describe the mass of an atom.
The number equal to the number of carbon atoms in exactly 12 grams of pure carbon-12: Avogadro's number.
Amount of three- dimensional space occupied by a substance.
The mass in grams of 1 mole of a compound.
Ratio of the 2 parts of the statement that relates the two units.
Down
A set of units; used in the industrialized world.
One cubic centimeter (ml).
The fundamental SI unit of mass.
Changing from 1 unit to another via conversion factors.
A scale that measures temperature.
Simply expresses a number as a product of a number between 1 and 10 and the appropriate power of 10.
The number of atoms in exactly 12 grams of pure carbon 12 equal to 6.022 by 10, to the 23rd power.
The weighted average mass of the atoms in a naturally occurring element.
A scale that measures temperature in water or at boiling point.
The exact formula of a molecule, giving the types of atoms and the number of each type.
The percent by mass of a component of a mixture or of a given element in a compound.
A set of units; used in the U.S.
The quantity of matter in an object.
Reducing to fewer digits
The fundamental unit; based on the prefixes for the various mass units.