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29 terms

Cal's science sec 1,3,4 key terms

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matter
anything that has mass and takes up space
chemistry
the study of the properties of matter and how matter changes
substance
A single kind of matter that is pure and has a specific set of properties
physical property
A characteristic of a pure substance that can be observed without changing it into another substance
chemical property
A characteristic of a pure substance that describes its ability to change into different substances
element
A pure substance that cannot be broken down into simpler substances
atom
The basic particle from which all elements are made
chemical bond
A force of attraction between two atoms
molecules
groups of two or more atoms held together by chemical bonds
compound
a pure substance made of two or more elements chemically combined
chemical formula
shows the elements in the compound and the ratio of atoms
mixture
two or more substances that have been mixed together but not chemically combined
heterogeneous mixture
a mixture in which different materials can be distinguished easily
homogeneous mixture
a type of mixture in which the substances are so evenly distributed that it is difficult to distinguish one substance in the mixture from another
solution
a homogeneous mixture of two or more substances
physical change
any change that alters the form or appearance of matter but does not make any substance in the matter into a different substance
chemical change
a change in matter that produces one or more new substances
law of conservation of mass
the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes
energy
the ability to do work or cause change
Temperature
the measure of the average energy of a random motion of particles of matter
thermal energy
the total energy of all the particles in an object
endothermic change
change in which energy is taken in
exothermic change
change in which energy is released
kinetic energy
energy of matter in motion
potential energy
energy an object has because of its position
chemical energy
the energy stored in chemical bonds
electromagnetic energy
a form of energy that travels through space as waves
electrical energy
the energy of electrically charged particles moving from one place to another
electrodes
metal strips placed in solution that do not touch