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Chemistry Ch 1-3
For exam 1
Question | Answer |
---|---|
Chemistry | the science that deals with the materials of the universe and the changes that these materials undergo. |
3 steps in scientific method | 1. State the problem and collect data. 2. Formulate hypothesis (possible explanation for the observation) 3. Perform experiments (to test hypothesis) |
Theory | a set of tested hypotheses that glues an overall explanation of some part of nature. |
Law | a summary of an observed behavior |
measurement | a quantive obervation |
scientific notation | a method for making very large or very small numbers more compact and easier to write. |
units | tell us what scale or standard is being used to represent the results of the measurement. |
International System abreviation | SI |
What unit of measure is used for mass and what is its abreviation? | kilogram / kg |
What unit of measure is used for length and what is its abreviation? | meter / m |
What unit of measure is used for time and what is its abreviation? | second / s |
What unit of measure is used for temperature and what is its abreviation? | kelvin / k |
Name the symbol, meaning, and scientific notation (power of 10) for the prefix mega. | M / 1,000,000 / 10 to the 6 |
Name the symbol, meaning, and scientific notation (power of 10) for the prefix kilo. | k / 1000 / 10 to the 3 |
Name the symbol, meaning, and scientific notation (power of 10) for the prefix deci. | d / 0.1 / 10 to the -1 |
Name the symbol, meaning, and scientific notation (power of 10) for the prefix centi. | c / 0.01 / 10 to the -2 |
Name the symbol, meaning, and scientific notation (power of 10) for the prefix milli. | m / 0.001 / 10 to the -3 |
Name the symbol, meaning, and scientific notation (power of 10) for the prefix micro. | u / 0.000001 / 10 to the -6 |
Name the symbol, meaning, and scientific notation (power of 10) for the prefix nano. | n / 0.000000001 / 10 to the -9 |
Measurements consist of both a _________ and a __________. | number / unit |
meter | fundamental SI unit of length |
volume | amount of 3D space occupied by a substance |
liter | SI unit of volume |
mass | the amount of matter inside an object |
kilogram | SI unit of mass |
significant figures | the numbers recorded in a measurement |
key for figuring Kelvin | K = C + 273 |
Celcius to Farenheit | F = 1.8(C) + 32 |
Farenheit to Celcius | C = F - 32/1.8 |
Density | amount of matter present in a given volume of substance. |
key for density | Density= mass/volume |
Matter has ______ and occupies ________. | mass / space |
3 states of matter | solid, liquid, and gas |
solid | rigid; has a fixed shape and volume |
liquid | has a definate volume but takes the shape of its container |
gas | has no fixed volume or shape; takes the shape and volume of its container |
physical properties | odor, color, boiling and freezing point, density, volume, and state. |
chemical properties | refers to a substance's ability to form new substances |
physical change | involves a change in physical properties but no change in fundamental components. (usually change of state) |
chemical change | change in fundamental components so it changes into different substances. |
Element | a substance that cannot be broken down into other substances by chemical methods |
compound | a substance composed of a given combination of elements that can be broken down into those elements by chemical methods |
mixture | something that has variable composition |
pure substance | always has the same composition |
2 types of mixtures | homogeneous and heterogeneous |
homogeneous | a mixture that is the same throughout |
heterogeneous | contains regions that have different properties from those of oher regions (ex: muddy water) |
distillation | the method for seperating the components of a liquid mixture that depends on differences in the ease of vaporization of the components. (liquid to gas and back to liquid) |
filtration | method for seperating the components of a mixture containing a solid and a liquid. |