chemistry

How closely a measured value agrees with the correct value

• the smallest particle of an element that maintains it chemical identity through all chemical and physical changes.
• The basic unit of an element that can enter into chemical combination.

the number of protons in the nucleus of an atom.

a change in which one or more new substances are formed

a substance composed of two or more elements in fixed proportions.

mass per unit volume

a substance that cannot be decomposed into simpler substances by chemical means.

describes a process that absorbs heat energy

a form of energy that flows between two samples of matter because of their difference in temperature

the capacity to do work or transfer heat

describes processes that release heat energy.

a mixture that does not have uniform composition and properties throughout.

Ex: sand with metal files in it.

a mixture that has uniform composition and properties throughout

• energy that matter possesses by virtue of it motion.
• energy expended by a moving object or energy of motion

a measure of the amount of matter in an object.

anything that has mass and occupies space.

a sample of matter composed of variable amounts of two or more substances, each of which retains its identity and properties.

the smallest particle of an element or compound that can have a stable independent existence.

• a change in which in substance changes from one physical state to another, but no substances with different compositions are formed.
• ex: water>ice>vapor

energy that matter possesses by virtue of its position, condition, or composition

how closely repeated measurements of the same quantity agree with one another.

characteristics that describe samples of matter.

any kind of matter all specimens of which have the same chemical composition and physical properties

a letter or group of letters that represents an element

a measure of the intensity of heat, that is, the hotness or coldness of a sample or object

molecules are separated by distances that are large compared with the size of the molecule

Molecules in a liquid are close together but are not held so rigidly in position and can move past one another

molecules held close together in an orderly fashion with little freedom of motion

• Contains only two atoms.
• Ex: H-Hydrogen, O-Oxygen, N-nitrogen, F-fluorine, I-iodine, Br-bromine, Cl-chlorine

Is the total number of neutrons and protons present in the nucleus of an atom of an element.

Is the number of protons in the nucleus of each atom of an element.

Electrically neutral particles having a mass slightly greater than that of protons

The positively charged particles in the nucleus

Negatively charged particles

Is that matter can be neither created nor destroyed.

The science that describes matter-its properties, the changes it undergoes, and the energy that accompany those processes.