An educated guess that attempts to explain an observation or answer a question
guess correctly, to find out by reasoning; to arrive at a conclusion on the basis of thought; to hint, suggest, imply
experiment that tests the effect of a single variable
something in an experiment that can change
variable that is changed in an experiment
the variable that is measured in an experiment
variable that is not changed in an experiment
Thinking that does not blindly accept arguments and conclusions
the information gathered from observations.
The study of earth and space; includes geology, meteorology, astronomy, and oceanography
The study of living things
represents an idea, event, or object to help people better understand it
the study of matter and energy
the study of the natural world
A theory that has been tested by and is consistent with generations of data
A well tested concept that explains a wide range of observations
an organized group of parts that work together to form a whole
tools and skills people use to meet their basic needs
a quantity that has both a number and a unit
the exactness of a measurement
How close a measurement is to the true value
an explanation of an observation
the international system of units
The basic SI unit of length
the amount of space an object takes up
the amount of matter in an object
SI unit for mass, one thousand grams
the vertical force exerted by a mass as a result of gravity
SI unit for temperature, - fundamental SI unit of temperature where zero degrees Kelvin is equal to absolute zero.
amount of change of one measurement in a given amount of time
a set of data arranged in rows and columns
A diagram that shows how two variables are related.
shows the relationship between two variables, shows change over time
a graph that uses horizontal or vertical bars to display data
A graph of data where the entire circle represents the whole or 100%, shows parts of a whole
method of making an educated guess at a measurement, An approximate calculation of quantity
used the cathode ray tube to discover the electron
(1743-1794) father of modern chemistry - co discovered oxygen and hydrogen, introduced metric system, invented first periodic table. Beheaded in French Revolution
British physicist discovered the nucleus, gold foil experiment- fired negative ions at thin sheet of gold foil, some particles were deflected almost as if it hit something solid
discovered the neutron, introduced Law of Conservation of Matter
discovered the atomic theory, or the idea that everything was made up of atoms, created first model of the atom
Periodic Table of Elements
the scientific chart that contains an arrangement of all known elements into a particular order based upon the number of protons and other properties of each element.
How many known elements in the Periodic Table of Elements
How many elements in the Periodic Table of Elements are naturally occuring
elements on the periodic table with high luster, good electrical conductivity, malleability, and loosely held valence electrons.
elements on the periodic table that are usually dull in appearance, poor conductors of heat and electricity, gases at room temperature
elements on the periodic table that are used because they have high melting points and are hard.
elements on the periodic table that have properties of both metals and nonmetals
non-metallic elements on the periodic table which contain the most stable and nonreactive elements (also called the inert gases because they do not participate in many chemical reactions)
the number of protons in the nucleus of an atom
total mass of the protons and neutrons in an atom, measured in atomic mass units
a one or two letter representation of an element, the abbreviation for the name of an element
Number of protons
equals number of electrons
Number of neutrons
Mass number - atomic number
Number of electrons
equals the number of protons
that which has mass and occupies space
the smallest unit of matter that has the characteristics of an element; consists of three main types of subatomic particles: protons neutrons and electrons.
a molecule composed of one kind of atom; cannot be broken into simpler units by chemical reactions.