
Fundamental substance that can’t be changed chemically or broken down into anything simpler 


A proposition or set of propositions, set forth as an explanation for an observed set of phenomena, either asserted merely as a provisional conjecture to guide investigation or accepted as highly probably in light of established facts 


A coherent group of tested general propositions generally regarded as correct, that can be used as principles of explanation and prediction for a class of phenomena 


A phenomena of nature that has been proven to invariably occur whenever certain conditions exist or are met. 


A chart of the elements arranged by increasing atomic number so that elements in a given group have similar chemical properties 


Any characteristic that can be used to describe or identify matter 


Properties of matter whose values do NOT depend on the amount of a sample 


Properties of matter whose values do depend on the amount of a sample 


Properties of matter that do NOT involve a change in the sample’s chemical makeup. 


Properties of matter that do involve a change in the sample’s chemical makeup. 


The amount of matter in an object. SI unit is the kilogram. Independent of an objects location. 


A measure of the force with which gravity pulls on an object. Depends on the location of an object. 


Standard SI unit of length. 


Standard SI unit of mass. 




How close a value is to the true value of a given measurement 


How well a number of independent measurements agree with one another. 


The total number of units recorded for a measurement. 

Rule #1 for significant figures 

Zeros in the middle of a number are always significant. 

Rule #2 for significant figures 

Zeros at the beginning of a number are not significant. 

Rule #3 for significant figures 

Zeros at the end of a number and to the right of the decimal point are always significant. 

Rule #4 for significant figures 

Zeros at the end of a number and to the left of the decimal point may or may not be considered significant. 

Rule #1 for Significant Figures and Rounding in Calculations 

When multiplying or dividing values, the resulting number cannot have more significant figures than any of the original values. 

Rule #2 for Significant Figures and Rounding in Calculations 

When adding or subtracting values the answer cannot have more digits to the right of the decimal point than either of the original numbers. 


If the first digit you remove is less than 5, round down by dropping that value and all following values. 


If the first digit you remove is 5 or greater, round up by adding 1 to the value to the left of the value dropped. 


A method of converting one unit into an equivalent quantity with another unit. 


An expression that describes the relationship between two different units. 



Celcius to Fahrenheit Conversion 


Fahrenheit to Celcius Conversion 


Conversion between degree Celcius and Kelvin 





The study of the composition, structure, properties, and changes of matter. 


anything that occupies space or has mass; the physical material of the universe 


the smallest representative particle of an element 


a substance composed of two or more atoms 


a substance composed of two or more elements united chemically in definite proportions 


matter that has no fixed volume or shape; it conforms to the shape and volume of the container 


matter that has a distinct volume, but no specific shape 


matter that has both a definite shape and a definite volume 


the three forms that matter can assume: solid, liquid, gas 


matter that has a fixed composition and distinct properties 


a combination of two or more substances in which each substance retains is own chemical identity 


a mixture of substances that has a uniform composition; a homogeneous mixture 

Law of Constant Composition (Law of Definite Proportions) 

A law that states that the elemental composition of a pure substance is always the same, regardless of its source. 
