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### 48 Cards in this Set

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• Back
 The process of trying to understand the world around us Science The use of knowledge gained through scientific thinking and problem solving to make produts or tools people can use Technology The step-by-step procedures of scientific problem solving; recognizing the problem, forming the hypothesis, testin the hypothesis, analyzing the data, and drawing conclusions Scientific Method Bit of information that can be gathered through your eyes, ears, and senses of touch, taste and smell Observation Conclusion based on an onservation Inference Statement that can be tested; based on observations, research, and prior knowledge of a problem Hypothesis The one factor chnged by the person doing the experiment Independent variable The factor being measured in an experiment Dependent Variable The factor in an experiment that does not change Constant The standard used for camparison in an experiment Control The way to describe the world with numbers; can describe objects and events with length, volume, mass, temperature, and rates Measurement THe method of making a rough measurement Estimation International System of Units, which was designed to give a worldwide standard of physical measurement for science, industry, and commerce and uses units such as the meter, cubic meter, kilogram, and kelvin SI SI unit of length Meter Amount of matter in an object Mass SI unit for mass Kilogram Scale that measures temperature in SI; begins at zero kelvin, which is the coldest temperature possible in nature Kelvin Ratio of 2 measurements with different units; (ex: miles per hour-mph) Rate Tool used to display information in rows and columns so that it is easier to read and understand Table Diagram that shows the relationship; tool used to collect, organize, and summarize data in a visual way so that it is easy to understand Graph Tool used to show the relationship between 2 variables Line Graph Tool that uses bars to show the relationships between variables; can be horizontal or vertical and can display any numerical data Bar Graph Tool used to show the parts of a whole Circle Graph Anything that has mass and occupies space Matter Small particle that makes up most types of matter and is made up of smaller parts called protons, neutrons, and electrons Atom Matter is neither created nor destroyed, only changed in form Law of Conservation of Matter Negatively charged particle found in a cloudlike formation surrounding an atom's nucleus Electron Positively charged, central part of an atom; directs all the activities of the cell and is surrounded by a double membrane Nucleus Particle in the nucleus of an atom that carries a positive charge Proton Uncharged particle in an atom's nucleus Neutrom Naturally occurring or synthetic material that cannot be brokem down to simpler materials by ordinary means, has a unique set of properties, and that is generally classified as a metal, a metalloid, or a nonmetal Element Whole number that tells how many protons are in the nucleus of each atom of an element Atomic Number Number that tells how heavy an element's atoms are compared with atoms of other elements Atomic Mass Two or more atoms of the same element that have different numbers of neutrons Isotope Sum of an atom's protons and neutrons Mass Number Elements that are malleable, ductile, generally have a shiny or metallic luster, and are not as good conductors of heat and electricity Metal Elements that are usually dull and are poor conductors of heat and electricity Nonmetal Elements that have characteristics of both metals and nonmetals. generally are brittle and dull, and are poor conductors of heat and electricity Metalloid Sample of matter that has the same composition and properties throughout Substance Pure substance produced when elements combine, and whose properties are different from those of the elements from which it is formed Compound A given compound is always made of the same elements in the same proportion by mass Law of Definite Proportions COmbinations of 2 or more substances that have not combined to form new, pure substances; can be uniform, where the individual parts cannot be seen, or nonuniform, where you can see individual parts Mixture Properties, or characteristics, such as color, texture, and shape, that can be observed without changing the makeup of a material Physical Property Physical property of a sample of matter-solid, liquid, gas, or plasma State of Matter Physical property that relates the mass of something to how much space it takes up; divide mass by volume Density Characteristics of a substance, such as the ability to react with oxygen, that allows it it change to a new substance Chemical Property Any change in the size, shape, or form of matter in which the makeup of athe matter remains the same and only the physical properties change Physical Change Any change where one or more of the original materials changes into other materials Chemical Change