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31 Cards in this Set
- Front
- Back
Goals of science |
Giving explanation for natural events, to understand pattern, and to make predictions |
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Controlled experiment |
An experiment in which only one variable is changed. |
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Controlled group |
The group in an experiment that is exposed to the same conditions as the experimental group except for one independent variable |
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Data |
Evidence,information gathered from observations |
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Theory |
A well tested explanation that unifies a broad range of observations and hypothesis,and enables scientists to make accurate predictions about new situations |
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Bias |
A particular preference or point of view that is personal rather than specific |
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Wht charactertiristics do all living things share |
Living things are made of basic units called cells,are based on a universal genetic code,obtain and use materials and energy, grow and develop,reproduce,respond to their environment,maintain a stable internal environment and change over time |
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Biology |
Scientific study of life |
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Dna |
Genetic material that organisms inherit from their parents |
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Stimulus |
A signal to which organism responds |
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Homeostasis |
The relatively constant internal physical and chemical conditions than organism maintains |
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Metabolism |
The combination of chemical reactions through which an organism builds up or breaks down materials |
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Biosphere |
The part of earth in which life exists,including land,water,and air or atmosphere |
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Scientific methodology |
Scientific methodology involves observing and asking questions, making inferences,and forming hypothesis,doing controlled experiments,collecting and analyzing data,and drawing conclusions |
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What three particles make up atoms |
Proton neutron and electron |
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Atom |
The basic unit of matter |
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Nucleus |
The center of an atom,which contain protons and neutrons |
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Electron |
Negatively charged particle;located in the space surrounding the nucleus |
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Element |
Pure substance that consists entirely of one type of atom |
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Isotope |
Isotope contains same number of protons, but different number of neutrons |
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Compound |
Substance formed by the chemical combination of two or more elements in definite proportions |
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Ionic bond |
Chemical bond formed when one or more electrons are transferred from one atom to another |
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Covalent bond |
A type of bond between atoms in which the electrons are shared |
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Molecule |
The smallest unit of most compounds that display all the properties of that compound |
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Cohesion |
The attraction between molecules of the same substance |
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Adhesion |
Force of attraction between different kinds of molecules |
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Solution |
Type of mixture in which all the components are evenly distributed |
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Suspension |
Mixture of water and non dissolved material |
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Acid |
Compound that releases H+ ions in solution,a solution of pH less than 7 |
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Base |
Compound that releases OH- in solution, a solution with a pH more than 7 |
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Buffer |
Compound that prevents sharp,sudden change in pH |