Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
30 Cards in this Set
- Front
- Back
|
Chemistry
|
The study of matter and the changes it undergoes. Often called central science.
|
|
|
Scientific Method
|
A systematic approach to research.
|
|
|
Qualitative
|
Consisting of general observations about the system. Ex. blue, round, smooth
|
|
|
Quantitative
|
Comprising numbers obtained by various measurements of the system. Ex. weighs 23 pounds, is 10 inches long
|
|
|
Hypothesis
|
A tentative explanation for a set of observations.
|
|
|
Law
|
A concise verbal or mathematical statement of a relationship between phenomena that is always the same under the same conditions.
|
|
|
Theory
|
A unifying principle that explains a body of facts and/or those laws that are based on them.
|
|
|
Matter
|
Anything that occupies space and has mass.
|
|
|
Substance
|
A form of matter that has a definite (constant) composition and distinct properties. Ex. water, ammonia, table salt.
|
|
|
Mixture
|
A combination of two or more substances in which the substances retain their distinct properties. Ex. air, pop, cement, and milk.
|
|
|
Homogeneous Mixture
|
The composition of the mixture is the same throughout. Ex. Sugar in water.
|
|
|
Heterogeneous Mixture
|
What you have when the composition is not uniform. Ex. Iron filings in sand.
|
|
|
Element
|
A substance that cannot be separated into simpler substances by chemical means.
|
|
|
Compound
|
A substance composed of atoms of two or more elements chemically united in fixed proportions. Can only be separated by chemical means.
|
|
|
Physical Property
|
Can be measured and observed without changing the composition or identity of a substance.
|
|
|
Chemical Property
|
Can be measured and observed only by going through a chemical change.
|
|
|
Extensive Property
|
DEPENDS on how much matter is being considers
|
|
|
Mass
|
The quantity of matter in a given sample of a substance.
|
|
|
Volume
|
Length Cubed. an extensive property.
|
|
|
Intensive Property
|
DOES NOT DEPEND on how much matter is being considered.
|
|
|
Density
|
Mass of an object divided by its volume.
M/V=D |
|
|
Macroscopic Properties
|
Can be determined directly.
|
|
|
Microscopic Properties
|
Must be determined by an indirect method.
|
|
|
International System of Units (SI)
|
A revised metric system developed in 1960 by the General Conference of Weights and Measures.
|
|
|
Weight
|
The force that gravity exerts on an object.
Mass x Gravity = weight |
|
|
Liter
|
The volume occupied by one cubic decimeter.
|
|
|
Significant Figures
|
The meaningful digits in a measured or calculated quantity.
|
|
|
Accuracy
|
How close a measurement is to the true value of the quantity that was measured. (2.1 is less accurate than 2.12492)
|
|
|
Precision
|
Refers to how closely two or more measurements of the same quantity agree with one another (student A says 2.13 inches student B says 2.14 is precise)
|
|
|
Kelvin
|
SI base unit of temperature. Does not use degrees.
|
