Card Set Information
Study notes for PEC Science Exams.
Anything that can change during an experiment is known as an
A system of knowledge based on facts or principals
A good expirament tests __ variable
Is what changes in an experiment because of the independent variable
Measure of space or capacity of a container. It is measured in
Volume, cubic meters
Variable that the scientist changes in the experiment
measure of quantity of matter in an object. the base unit is ___.
an answer to your question that can be tested
a systematic way of answering questions or solving problems
used to compare data
used to show change over time
used to show parts of a whole
anything that has mass and occupies space
law of conservation of mass states"
mass is neither created nor destroyed
law of conservation of energy states:
energy is neither created nor destroyed
change of a substance that occurs without a change in composition
substance that cant be broken down into simpler substances
a change that occurs when a substance changes composition by forming one or more new substances
mass per unit volume of a substance or "how much stuff is inside an object"
chemical symbols and letters indicating the atoms contained in the basic unit of a substance
when a mixture yeilds the same composition throughout
when a mixture does not uniformly mix
attractive force that holds atoms or ions together
atoms join to form bonds so each element has a
full outer shell
atom with a positive charge
atom with a negative charge
ion made of two or more atoms that are covalently bonded and that act like a single ion
bond formed when atoms share electrons. they bond a __ to a __.
covalent bond. nonmetal to a nonmetal
bond formed from a transfer of electrons between oppositely charged ions. they bond __ to __.
ionic bond/ metals to nonmetals
tiny units that determine the properties of all matter
states that when the elements are arranged by their number of protons, the similarities in their properties will occur in a regular pattern.
most elements on the periodic table are
any atom that has the same number of protons but a different number of neutrons
horizontal rows are the __. it tells us how many ___ are in an element.
periods, valence electrons
the center of an atom
vertical column on the periodic table, it tells us how many __ are in an atom
process of removing or adding electrons to an atom is called
all atoms have a __ charge
number of protons in the nucleus of the atom. it is equal to the number of __ .
atomic number, electrons
positively charged subatomic particle
negatively charged subatomic particle
subatomic particle with no charge
metallic elements in groups 3- 12 of the periodic table
elements located in group 17 of the periodic table
elements located in group 18 of the periodic table. they are __ or unreactive.
noble gases, inert.
electron on the outermost energy level
milk is a ___
apple pie is a ___
tearing a piece of paper is a __.
how do you find the number of neutrons in an atom?
electrons - protons