Chemical Interaction Chapter 2 Section 1

matter

anything that has mass and takes up space

chemistry

the study of matter and how matter changes

How can matter be described in two kinds of properties?

physical properties and chemical properties

How can changes in matter be described?

in terms of physical changes and chemical changes

physical property

a characteristic of a substance that can be observed without changing the substance into another substance

chemical property

a characteristic of a substance that describes its ability to change into other substances. to observe the chemical properties of a substance, you must change it to another substance.

physical change

any change that alters the form or appearance of a substance but that does not make the substance into another substance

chemical reactions

a change in matter that produces one or more new substances

what is another name for chemical reaction?

chemical change

when do chemical changes occur?

when bonds break and new bonds form

what are the chemical reactions that involve two main kinds of changes that you can observe?

formation of new substances and changes in energy

precipitate

a solid that forms from the solution during a chemical reaction

endothermic reaction

reaction in which energy is absorbed

exothermic reaction

a reactions that releases energy in the form of heat