Page 61 - Chemistry--atom first

Chapter 1 | Essential Ideas 51
Key Terms
accuracy how closely a measurement aligns with a correct value
atom smallest particle of an element that can enter into a chemical combination
Celsius (°C) unit of temperature; water freezes at 0 °C and boils at 100 °C on this scale
chemical change change producing a different kind of matter from the original kind of matter
chemical property behavior that is related to the change of one kind of matter into another kind of matter chemistry study of the composition, properties, and interactions of matter
compound pure substance that can be decomposed into two or more elements
cubic centimeter (cm3 or cc) volume of a cube with an edge length of exactly 1 cm
cubic meter (m3) SI unit of volume
density ratio of mass to volume for a substance or object
dimensional analysis (also, factor-label method) versatile mathematical approach that can be applied to computations ranging from simple unit conversions to more complex, multi-step calculations involving several different quantities
element substance that is composed of a single type of atom; a substance that cannot be decomposed by a chemical change
exact number number derived by counting or by definition
extensive property property of a substance that depends on the amount of the substance
Fahrenheit unit of temperature; water freezes at 32 °F and boils at 212 °F on this scale
gas state in which matter has neither definite volume nor shape
heterogeneous mixture combination of substances with a composition that varies from point to point
homogeneous mixture (also, solution) combination of substances with a composition that is uniform throughout
hypothesis tentative explanation of observations that acts as a guide for gathering and checking information
intensive property property of a substance that is independent of the amount of the substance
kelvin (K) SI unit of temperature; 273.15 K = 0 oC
kilogram (kg) standard SI unit of mass; 1 kg = approximately 2.2 pounds
law statement that summarizes a vast number of experimental observations, and describes or predicts some aspect of the natural world
law of conservation of matter when matter converts from one type to another or changes form, there is no detectable change in the total amount of matter present
length measure of one dimension of an object
liquid state of matter that has a definite volume but indefinite shape