Cerrar
Approximately -273° C; the lowest possible temperature
A compound that releases hydrogen ions when dissolved in water; has a pH of less than 7
Simple, one-celled plantlike organism found in water or damp places; includes seaweeds, pond scum, and so on
A substance composed of two or more metals
The layer of air surrounding Earth
The pressure exerted by the atmosphere on every part of Earth's surface; approximately 10 newtons per square centimeter
The smallest part of an element that is recognizable as that element
An instrument that measures atmospheric pressure
A compound that releases hydroxide ions in water; has a pH of more than 7; is sometimes called an alkali
The temperature at which additional thermal energy causes a substance to change from a liquid to a vapor
A quantity of heat energy; the amount needed to raise the temperature of one gram of water 1° C
An organic compound-like sugar or starch that contains carbon, hydrogen, and oxygen in the ratio of 1:2:1; the human body's main source of energy
A cancer-causing agent
Meat-eater
A substance that speeds up a chemical reaction without being changed by the reaction
The lowest-level structure of any living organism that can perform all the functions of life, including reproduction
The main pigment in plants that captures light energy during photosynthesis
A substance composed of two or more chemically bonded elements
The exact amount of substance dissolved in a given amount of solvent; refers to a solution
The process whereby a decrease in energy causes vapor particles to return to a liquid phase
A material that allows heat or electricity to flow through it with minimal resistance
A sample in which no variables are tested, thus serving as a basis for comparison
A variable that stays constant in an experiment, allowing the effect of another variable to be measured
The circulation of fluid caused by warm fluid rising and cool fluid sinking
In a physics sense, the amount of mass per unit volume; in a more general sense, the quantity per unit area or volume
The scattering of light; the spreading of a liquid or gas from areas of higher concentration to areas of lower concentration
Nucleic acid in the cells of an organism; contains the genes of an organism and transmits these to future generations
A sequence of changes in the plant and/or animal life of a region over time
A negatively charged fundamental atomic particle
A substance consisting of exactly one type of atom
Wearing away; typically the washing away of sand or rock by running water or wind
The changing of a fluid into gas
The preserved remains of a very old organism
The number of cycles per unit time of a repeating phenomenon
A simple sugar that is broken down to provide energy to an organism
The part of an ecosystem where a plant or animal naturally grows or lives
An animal that eats only plants
A chemical substance secreted by a gland of the body that affects other parts of the body
The amount of water vapor in the air
A statement that is a proposed explanation of a scientific phenomenon
Electromagnetic waves whose wavelength is longer than that of visible light
A substance that blocks the flow of heat or electricity
A molecule or atom that has become charged by either gaining or losing an electron
A variety of an element with the same number of protons per atom but a different number of neutrons
The energy of an object due to its motion
The temperature at which additional thermal energy breaks the chemical bonds holding a substance together and causes the substance to change from the solid to a liquid state
The smallest unit of a chemical compound
A fundamental atomic particle that has no charge
A piece of rock from which metal can be profitably extracted
The movement of liquid through a membrane
An organism that invades another organism and feeds off it
A numerical scale from 1-14 representing the acidity or alkalinity of a solution; 1 is very acidic, 14 is very alkaline, and 7 is neutral
The process in which plants use the sun's energy to convert carbon dioxide and water into glucose
Force per unit area
A complex molecule composed of amino acids that carries out a variety of processes in cells
A positively charged fundamental atomic particle
A complex carbohydrate found in potatoes, rice, corn, and many other vegetables
A close relationship between two organisms that is mutually beneficial
Electromagnetic waves with wavelength shorter than that of visible light
The gaseous form of a liquid
Electromagnetic radiation with wavelength shorter than ultraviolet radiation
The force that attracts one object to another and is dependent on mass, is known as
The acidity or alkalinity or a substance is measured using the ____ scale, which ranges from 1 to 14.
An electromagnetic wave with a wavelength longer than that of X-rays, but shorter than that of visible light is in the ____ part of the spectrum.
The energy an object has when it is stationary is known as its ____.
The changeable parameters in an experiment as the ____.
The central part of an atom, which is orbited by electrons is the ____.
A term which does not change its value is a ____.
A neutral particle found in the center of an atom is a ____.
When a liquid is cooled below its freezing point, it becomes a ____.
An animal that eats both plants and meat is an ____.
____ orbit the nucleus of an atom.
A compound which may induce cancer is a ____.
Absolute zero is ____ degrees Celsius.
____ is the mass per unit volume.
The energy associated with a moving object is the ____ energy.
Conduction
Convection
Polarity
Potential Energy
Capacitor
Buoyancy
Radiation
Frequency
Mechanical energy
Electrical Circuit
Waves
Acceleration
Resistor
Four States of Matter
Amplitude
Volt
Velocity
Density
Work
Electrical Current
Charge
Wavelength
Ampere
Kinetic Energy
Potential Energy
Condensation
Molar Mass
Atom
Ion
Freezing Point
Endothermic
Reactant
Solute
Evaporation
Solvent
Solution
Acid
Atomic Number
Electron
Melting Point
Neutrons
Nucleus
Product
Molecule
Base
Viscosity
Atomic Mass
pH
Proton
Exothermic
Boiling Point
Isotope
Phenotype
Prokaryotic Organism
Genotype
Digestive System
Nucleobases
Osmosis
Mitosis
Eukaryotic Organism
RNA
DNA
Genes
Ribosome
Respiratory System
Pollination
Proteins
Meiosis
Stages of Cellular Division
Circulatory System
Allele
Chromosomes
Metamorphosis
Mitochondrion
Photosynthesis
Dominant and Recessive Traits
Osmosis
Hypothesis
Control
Matter
Air Resistance
Three Primary Layers of the Earth
Gas Giant
Dependent Variable
Terrestrial Planet
Mass
Altitude
Five Primary Layers of the Atmosphere
Orbit
Erosion
Independent Variable
Metamorphism
