JPChapter 1 Word Scramble
|
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Question | Answer |
Matter | anything that has mass and takes up space (macro/microscopic) |
Chemistry | the study of matter and the changes it undergoes |
Mass | describes the quantity of matter in an object |
Weight | the force of gravity exerted on an object- can be different on different planets, use the word weighing though we really mean massing |
Law of Conservation of Mass | in a non-nuclear chemical reaction, mass is not creatd or destroyed |
Solid | keeps shape and volume, low compressability |
Liquid | keep volume but not shape, relative compressability |
Gas | doesn't hold shape or volume, high compressability |
Physical Changes | invlove altering the physical state of a substance without changing its chemical composition (melting, freezing, boiling, condensation) |
Physical Properties | describes the color, odor, melting/freezing point, density, etc. of a substance and do not change the composition or identity of a substance |
Chemical Changes | involve altering chemical identity of a substance ( also called chemical reaction) |
Chemical Properties | characteristics of how a substances undergoes chemical change- such as: hydrogen burns in oxygen to make water |
Pure Substance | a single chemical entity- one kind of matter with a set of constant physical and chemical properties- may be element or a compound- it cannot be seperated into other kinds of matter by any physical properties |
Element | contain single type of atom- they cannot be decomposed by any chemical reaction into simpler substances |
Atom | the smallest piece possible of an element |
Elemental Symbols | abbreviation used to represent an atom of a element- one or two letters, only first one is capitalized |
Compound | substance composed of two or more elements chemically combined |
Law of Definite Proportions | different samples of the same compound always contain its constituent elements in the same proportion by mass- i.e. all samples of CO2 have the same ratio by mass of C to O |
Mixture | contain two or more substances each or which retain it own distinct identity and can be seperated by physical means |
Heterogeneous Mixture | mixture has distinct phases or parts- i.e. oil and water, sand in water, iron fillings in salt |
Homogeneous Mixture | mixture has a uniform appearance and composition thoughout |
Precision | refers to the closeness of the set of values obtained from identical measurements of a quantity (values close together) |
Accuracy | refers to the closeness of a single measurement to its true value (close to true value) |
Significant Figures | number of meaningful digits in a repeated number, only the last digit in the number is not known with certainty |
Doubtful Digit | the last digit is uncertain but signficant- ex. when you measure a rod you get 9.12, 9.11, and 9.13; the first two numbers (9.1) are certain, the next digit is an estimate with some uncertainty |
Scientific Notation | used to remove ambiguity of a number- especially to simplify very large/small numbers |
Exact Numbers | have infinite number of significant figures (counted quantities, definitions)- ex. there are 9 coins in a bottle, 12 inches in a foot |
Density | how concentrated some form of matter is- specifically the ratio of mass to volume |
Meter | SI base unit of length |
Kilogram | SI base unit of mass |
Second | SI base unit of time |
Derived Unit | combinations of the fundalmetal quantities of length, mass, time, etc.- ex. density in g/mL, velocity in m/s |
Temperature | scale established by arbitrarily, but consistantly, setting fixed points and temperature increments called degrees |
Factor-label/Dimensional Analysis Method | used to convert one unit to another |
Unit/Conversion Factors | used to perform factor-label calculations- ex. 7 days in a week, 10 pennies to a dime |
Created by:
jpclark
Popular Chemistry sets