Science Chapter 1 Vocab
what will happen to an objects weight if you move it from earth to outer space
an objects weight will change if you move it from earth to outer space but its mass will stay the same
who was john dalton
atoms had to have certain characteristics
how are solutions related to mixtures
because solutions are well mixed mixtures and mixtures are two things combined together
two examples of characteristic priorities
boiling point and melting point
what are two examples of characteristic properties
boiling point and melting point
how is density calculated
density= mass divided by volume
pyrite
fools gold
physical change
a change in a substance that does not change its identity, example (crumpling paper)
chemical change
a change in which one or more substances combine or break apart to form a new substance, example (burning wood)
whats a molecule
a group of atoms that act as a single unit
characteristic property
a quality of a substance that never changes, and can be used to identify the substance
ore
a rock that contains a metal or other economically useful material
compund
a substance made of two or more elements chemically combined, example (H2O)
pure substance
a substance made only of one kind of matter and has definite properties
element
a substance that cannot be broken down into other substances
solution
a very well mixed mixture, example ( sea water)
whats is an atom
an atom is the smallest particle of a element
electrolysis
an electric current that breaks the chemical bond that joins the metal and other elements in the compound
describe how panning for gold takes advantage of one of golds characteristic properties
gold is dense
how do you calculate volume
length times width times hight
what two quantities do you need to know in order to calculate density
mass and volume
how can matter be classified
matter can be classified into two categories, mixture and a pure substance
what are the three states of matter?
solid,liquid, and gas
melting point
temperature in which a substance changes from a solid to a liquid
chemical activity
the ability of a substance to undergo a specific chemical change; another example of a characteristic property
whats a chemical bond
the force that holds two atoms together
what is the SI unit for mass
the measure used to measure the properties of matter, International System of Units (SI), the SI unit used kilograms
chemistry
the study of matter and how it changes
boiling point
the temperature in which a substance changes a liquid to a gas
why are characteristic properties useful
they can be used to identify unknown matter because characteristic properties never change
mixture
two or more substances that are mixed together but not chemically combined, example (cookie dough)
what is the differenct between weight and mass
weight is the measure of the force of gravity on you mass is the measurement of how much matter it contains
