Science Exam

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

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"

law of conservation of energy states:

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

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 __.

bond formed from a transfer of electrons between oppositely charged ions. they bond __ to __.

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.

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 __ .

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.

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?