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### 69 Cards in this Set

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• Back
 Hypothesis? a tentative explanation for what has been observed Independent variable? the variable that you plan to change Dependent Variable? the variable whose value depends on the independent variable Control in a experiment the standard used variable for comparison In an experiment how many variables can be changed at a time? one What is the difference between Theory and scientific law? ■A theory is an explanation of a natural Phenomenon based on many observations and investigations over time Scientific aw is a relationship in nature that is supported by many experiments. The systematic approach used in scientific studies is called the? Scientific Method Evolution is an example of a? Theory Si unit of mass is the? kilogram Si unit of time is? Second Si unit of length is? meter Si unit of volume? Cubic meter Formula of mass? Volume x Density Temperature? Celsius and Fahrenheit Formula for density? density= mass/ volume Accuracy? Refers to how close a measured value is to an accepted value Precision? Refers to hoe close a series of measurements are to one another precise measurements show little variation over a series of trials but might not be accurate Density? The amount of mass per unit volume a physical property Scientific notation? can be used to express any number as a number between 1- 10 (coefficient) multiplied by 10 raised to a power (exponent) When the exponent is negative it is a small number and when it is positive it is a big number Significant figures? all known digits plus one estimated digit. If all of your darts hit the bulls eye you have been? Both accurate and Precise If all your darts hit the wall near each other away from the bulls eye you have been? precise Chemistry is the study of? matter and its changes Matter is divided into two categories ? Mixtures and pure Substances Mixtures can be? homogeneous or heterogeneous Pure substances are either ? elements or compounds Heterogeneous mixture? is a mixture that does not bend smoothly throughout and which the individual substances remain distinct. Homogeneous mixture? is a mixture that has constant composition throughout it always has a single phase Physical change? alters a substance without changing composition Chemical Change? involves one or more substances changing into a new substance. Mixture? is a combination of two or more pure substances retains its individual chemical property What is a physical property? is a characteristic that can be observed or measured without changing the samples compositions. What is a chemical property? is the ability of a substance to combine with or change into one or more other substances Physical changes? are changes that do not create a new substance (state changes Compound? - is made of two or more different elements combined chemically ______are elements on the left side of the periodic table that are often shiny solids that conduct electricy Metals Element? a pure substance that cannot be separated into a simper form Chemical Properties can be determined by ? changing the substance most commonly chemical properties include the REACTIVITY of a substance Physical properties can be determined ? without changing a substance ex color density and solubility Chemical Properties can be determined by ? changing the substance most commonly chemical properties include the REACTIVITY of a substance Chemical changes? are changes that create a new substance Physical properties can be determined ? without changing a substance ex color density and solubility What is a physical property? is a characteristic that can be observed or measured without changing the samples compositions. What is a physical property? is a characteristic that can be observed or measured without changing the samples compositions. Physical changes? are changes that do not create a new substance (state changes Solution is? homogeneous Solution is? homogeneous What is a chemical property? is the ability of a substance to combine with or change into one or more other substances ______are elements on the left side of the periodic table that are often shiny solids that conduct electricy Metals Chemical changes? are changes that create a new substance Compound? - is made of two or more different elements combined chemically What is a chemical property? is the ability of a substance to combine with or change into one or more other substances Compound? - is made of two or more different elements combined chemically ______are elements on the left side of the periodic table that are often shiny solids that conduct electricy Metals Element? a pure substance that cannot be separated into a simper form What is a physical property? is a characteristic that can be observed or measured without changing the samples compositions. Physical properties can be determined ? without changing a substance ex color density and solubility What is a chemical property? is the ability of a substance to combine with or change into one or more other substances Element? a pure substance that cannot be separated into a simper form Physical changes? are changes that do not create a new substance (state changes Compound? - is made of two or more different elements combined chemically Chemical Properties can be determined by ? changing the substance most commonly chemical properties include the REACTIVITY of a substance ______are elements on the left side of the periodic table that are often shiny solids that conduct electricy Metals Chemical changes? are changes that create a new substance Physical changes? are changes that do not create a new substance (state changes ______are elements on the left side of the periodic table that are often shiny solids that conduct electricy Metals Chemical Properties can be determined by ? changing the substance most commonly chemical properties include the REACTIVITY of a substance Element? a pure substance that cannot be separated into a simper form What is a chemical property? is the ability of a substance to combine with or change into one or more other substances Compound? - is made of two or more different elements combined chemically