Tags & Description
Chemistry
The study of the properties and behavior of matter.
Matter
The physical material of the universe; anything that has mass and takes up space.
Property
Any characteristic that allows us to recognize a particular type of matter and distinguish it from other types.
Elements
Substances that combine to create matter.
Atoms
The tiniest particles that are the building blocks of matter.
Molecules
Two or more atoms bonded together.
States of Matter
Solid, liquid, and gas.
Solid
Fixed volume and shape, molecules packed tightly together.
Liquid
Fixed volume, takes shape of container, molecules move fast.
Gas
No fixed volume or shape, takes shape of container, molecules are far apart.
Pure Substances
Matter with distinct properties and a composition that does not vary.
Elements
Cannot be decomposed into simpler substances, composed of one kind of atom.
Compounds
Can be decomposed, made up of two or more elements.
Mixtures
Combinations of two or more substances, can have various compositions.
Physical Properties
Observable without changing identity or composition of substance.
Chemical Properties
Describe how a substance may change or react to form other substances.
Intensive Properties
Do not depend on the amount of sample being examined.
Extensive Properties
Depend on the amount of sample.
Physical Changes
Substance changes physical appearance but not composition.
Chemical Changes
Substance transforms into a new substance.
Separation of Mixtures
Filtration separates solids from liquids or gases, distillation separates substances based on different abilities to form gases.
Energy
The ability to do work or transfer heat.
Work
Energy transferred when a force is exerted on an object causing displacement.
Heat
Energy used to increase temperature of an object.
Force
Any push or pull exerted on an object.
Kinetic Energy
Energy of motion.
Potential Energy
Stored energy.
Electrostatic Potential Energy
Arises from interactions between charged particles.
SI Units
Preferred metric units for science.
Physical Quantity
Length, mass, temperature, time, amount of substance, electric current, luminous intensity.
The Scientific Method
Collect information, formulate hypothesis, test hypothesis, formulate theory, repeatedly test theory.
Temperature
Kelvin (K) for temperature, Celsius (C) and Fahrenheit (F) for conversions.
Derived SI Units
Volume (m³), density (mass/volume), energy (joule, J), calorie (cal), kilojoule (kJ).
Exact Numbers
Defined values, no uncertainty.
Inexact Numbers
Values with uncertainty, from measurements or errors.
Precision
Measure of how closely individual measurements agree with one another.
Accuracy
How closely individual measurements agree with the correct value.
Significant Figures
All digits of a measured quantity, indicate precision.
Adding and Subtracting Significant Figures
Answer has same number of decimal places as measurement with fewest decimal places.
Multiplying and Dividing Significant Figures
Answer has same number of significant figures as measurement with fewest significant figures.
Dimensional Analysis
Units multiplied or divided along with numerical values.
Conversion Factors
Fractions used to convert between units.