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a representation of an object or event that can be studied to understand the real object or event
when you approach a problem by asking questions, making observations, and using logic to make a decision
a change that occurs when one or more substances change into entirely new substances with different properties
a substance that cannot be separated or broken down into simpler substances by chemical means
characteristics tha can be observed without changing the identity of the substance
a state of matter that consists of free-moving ions and electrons that does not have definite shape or volume
the laws that state the mathematical relationships between the volume, temperature, pressure, and quantity of as
a measure of how hot or cold something is; specifically, a measure of the average kinetic energy of the particles in an object
law of definite proportions
this states that a chemical compound always contains the same elemetns in exactly the same proportions by weight or mass. an example of this is water.
an atom that has the same number of protons but a defferent number of neutrons relative to other atoms of the same element
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