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9weeks chemistry
| Question | Answer |
|---|---|
| used to write very large or very small numbers | scientific notation |
| is a measure of the reproducibility of a measurement | precision |
| is a technique for converting between units | dimensional analysis |
| is used to make units larger or smaller | metric prefixes |
| anything that has mass and volume | matter |
| is the capacity to do work or produce heat | energy |
| theoretically lowest temperature that can be reached | absolute zero |
| substances that can not be changed into simpler substances by a chemical change | element |
| substances that contain two or more elements in a fixed problem | compounds |
| a blend of two or more pure substances | mixture |
| a method to separate heterogeneous mixtures | filtration |
| a method to separate homogeneous mixtures | distillation |
| a measure of how hot or cold something is | temperature |
| what are the states of matter? | solid, liquid, gas |
| For numbers less than one the exponent is _______ | negative |
| one calorie is the amount of heat that raises the temperature of one gram of water to one degree centigrade. T/F | true |
| Liquids as matter have definite volume and definite shape T/F | false |
| the SI temperature scale is called the ________ scale | Kelvin |
| In the measurement 43.52, which digit is the most uncertain? | 2 |
| how many significant digits are in 6.80 | 3 |
| the number 210,000 has how many significant digits? | 2 |
| which of the following is not a pure substance a) milk b)hydrogen c)water | milk |
| what is the correct scientific notation for 503,000,000 | 5.03 x 10^8 |
| A baby has a fever, his temperature is 40 degrees celsius. what is his temperature in the kelvin scale? | K=C+273, K=40+273, K=313 |
| How do you find Kelvin from Celsius? | K=C+273 |
| How do you find Celsius from Kelvin? | C=K-273 |
| after making observations and proposing an hypothesis, a scientist's next step is ____________ | perform an experiment |
| the metric measure best suited to measure distance between Jackson, MS and Memphis, TN would be ________ | kilometers |
| How many significant digits are in 5.0070 | 5 |
| T/F: It is not necessary to clean up your work area in a lab | False |
| T/F: All lab measurements are certain | False |
| T/F: the density of a substance is measure g/cm^3 | True |
| T/F: the metric system uses measures of ten to express large or small numbers and is used by the scientific community | True |
| 1 kilometer is equal to ________ meters | 1000 |
| 1 centimeter = _______ millimeters | 10 |
| 1 mega gram = _____ grams | 1,000,000 |
| 5 x 10^-5 | .00005 |
| study of substances and the changes they undergo | chemistry |
| orderly and systemic approach to gathering information to answer questions about the world | scientifc method |
| proposed by unproved explanations of observed facts | hypothesis |
| repeated explanation of phenomenon that occurs in the natural world | theory |
| factor being tested in an experiment | variable |
| smallest particle of an element that retains the chemical identity of that element | atom |
| an atom or group of atoms with a net electrical charge | ion |
| atoms that have the same number of protons but different number of neutrons | isotope |
| the spontaneous emission of radiation from an element's nucleus | radioactive element |
| least penetrating radiation | alpha radiation |
| most penetrating radiation | gamma radiation |
| is a negative charge decay | beta radiation |
Created by:
jackjack109
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