Chem 107 #1 UL
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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Statement summarizing past observations that is always the same under the same conditions | Law
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statement explaining observations and laws | Theory
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study of matter and the changes it undergoes | chemistry
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anything that occupies space and has mass | Matter
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Compounds and elements are examples of ____ | Pure substances
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Two examples of mixtures are ___ and ___ | Homogeneous and heterogenous
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Form of matter with definite composition and distinct properties | Pure substance
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substance composed of only one kind of atom | Element
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substance composed of two of more different elements chemically united in fixed proportions | Compound
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__ change does not alter the composition identity of a material | Physical
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__ change alters the composition of identity of the material involved | Chemical
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__ property of a material depends on how much matter is considered. Examples: mass and volume | Extensive
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___ property does not depend on how much matter is being considered. Examples: density and temperature | Intensive
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Measure of the quantity of matter | mass
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includes the force that gravity exerts on an object | weight
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mass/volume | density
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Significant figures; addition/ subtractions | least number of decimal places
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Significant figures: multiplication/ division | least number of significant figures
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How close a measurement is to the true value | Accuracy
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how close a set of measurements are to each other | Precision
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Elements are composed of extremely small particles called atoms | Dalton's atomic theory
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All atoms of a given elements are identical, having the same size, mass and chemical properties. The atoms one element are different from the atoms of all other elements | Dalton's atomic theory
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Atoms combine in simple, whole-number ratios to form compounds | Dalton's atomic theory
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Different samples of the same compound always contain the same proportion of elements by mass | Law of definite proportions
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Elements can combine in different ways to form different compounds, whose mass ratios are simple whole numbers | Law of multiple proportions
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A chemical reaction involves only the separation, combinations, or rearrangement of atoms; it does not result in their creation of destruction | Dalton's Atomic Theory
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Matter can neither be created nor destroyed | Law of conservation of mass
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Basic unit of an element that can enter into chemical reaction | atom
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The ___ was discovered by Joesph Thomson with the cathode ray tube | Electron
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The __ by discovered Ernest Rutherford alpha particle scattering. | Proton
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The ___ by discovered by James Chadwick | neutron
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at least 2 distinct forms of an element have different properties | Allotrope
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bond formed between two ions, a metal and nonmetal. | ionic
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positively- charged ion, formed by losing electrons | cation
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negatively- charged ion, formed by gaining electrons | anion
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SCN- | thiocyanate
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C2O4-2 | Oxalate
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IO- | Hypoiodite
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IO-2 | Iodite
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IO-3 | Iodate
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IO-4 | Periodate
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