Chapter 2 Study Guide Flashcards
anything that has mass and takes up space
matter
a single kind of matter that is pure, meaning it always has a specific makeup or composition and a specific set of properties
substance
a characteristic of a pure substance that can be observed without changing it into another substance
physical property
a characteristic of a pure substance that describes its ability to change into different substances
chemical property
a pure substance that cannot be broken down into any other substances by chemical or physical means
element
the basic particle from which all elements are made
atom
a force of attraction between two atoms when they combine
chemical bond
groups of two or more atoms held together by chemical bonds
molecule
a pure substance made of 2 or more elements chemically combined in a set ratio
compound
shows the elements in the compound and the ratio of atoms
chemical formula
made of 2 or more substances
mixture
you can see the different parts
heterogeneous mixture
very evenly mixed so that you can’t see the different parts
homogeneous mixture
an example of a homogeneous mixture
solution
any change that alters the form or appearance of matter but does not make any substance in the matter into a different substance
physical change
a change in matter that produces one or more new substances
chemical change
matter is not created or destroyed in any chemical or physical change
law of conservation of matter
the ability to do work or cause change
energy
a measure of the average energy in a random motion of particles of matter
temperature
the total energy of all of the particles in an object
thermal energy
a change in which energy is taken in
endothermic change
releases energy
exothermic change
the energy stored in chemical bonds between atoms is a form of energy
chemical energy
a form of energy that travels through space as waves
electromagnetic energy
