compounds and molecules Flashcards
what is a compound?
a substance consisting of atoms of two or more elements chemically bonded together in a fixed ratio
what is a element?
a substance consisting of only one type of atom
what is a molecule?
a group of atoms covalently bonded together representing the smallest unit of the element or compound that can take part in a chemical reaction.
what is a pure substance?
: composed of only one substance
what is a substance?
an element or compound
what is a mixture?
two or more substances that are not chemically combined with each other and can be separated by physical means. The substances in a mixture retain their individual properties
what are the properties of a heterogenous mixture?
Considered the “least mixed.”
Does not appear to be the same throughout.
Particles are large enough to be seen and to be separated from the mixture
what are the properties of a homogenous mixture?
A mixture that appears to be the same throughout.
It is “well mixed.”
The particles that make up the mixture are very small and not easily recognizable
what is a colloid?
the particles are mixed together but not dissolved.
does a solution always have a solvent and solute?
yes
what are the physical properties of a pure substance?
fixed Melting and boiling points Electrical and thermal conductivity Density Solubility
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