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Unit 1
Chemistry
| Question | Answer |
|---|---|
| Define Qualitative | Qualitative measurment- descriptive, non-numeric (the room is cold). |
| Define Quantitative | Quantitative measurment- definitive, using numbers and units (the temp outside is 30 degrees). |
| What is the mnemonic device for the metric system? | G..M..KHDBdcm..ɥ..n |
| What does the G stand for? | Giga |
| What does the M stand for? | Mega |
| What does the K stand for? | Kilo |
| What does the H stand for? | Hecto |
| What does the D stand for? | Deka |
| What does the B stand for? | Base unit (meter, liter, or gram). |
| What does the d stand for? | deci |
| What does the c stand for? | centi |
| What does the m stand for? | milli |
| What does the ɥ stand for? | micro |
| What does the n stand for? | nano |
| How does one calculate the percent error? | Theoretical - Experimental/Theoretical x 100 *no negative #s* |
| What does Celcius and Kelvin mean? | Are temp scales. To find K you do °C+273. And to find °C you do K-273. |
| When using sig figs, how do you know which number to use? | You always use the smaller one. |
| When using sig figs, if the numbers are on the left of the decimal point, how does one find sig figs? | You count all numbers (including 0) and start from the left and move to the right. |
| When using sig figs, if the numbers are on the right of the decimal point, how does one find sig figs? | You start counting once the numbers start. For example 0.00567 has 5 sig figs. |
| Define matter. | Anything that has mass and occupies space. |
| Define pure substances. | Matter that has a fixed or definite composition elements and compounds. |
| Define element. | Simplest type of pure substance, composed of only one type of material. Ex-silver, iron, aluminum. |
| Define compound. | Atoms of two or more elements chemically combined in a specific ratio. |
| How can you break down a compound? | Heating: sugar breaks down into carbon (element) and water vapor (compound). Electricity: breaks down water into hydrogen and oxygen. |
| Define mixtures. | Two or more different substances are physically mixed, but not chemically combined. |
| Define heterogenous misture. | A mixture in which the composition is not the same throughout. Ex - salad, pickle relish, chicken noodle soup. |
| Define homogenous mixture. | A mixture in which the composition is the same throughout. Ex - salt water, sugar water, brass. (Also called a solution) |
| Define physical change. | Some properties of a material may change but the composition of the property does not change. Can be reversible or irreversible. |
| Define chemical reaction. | One or more substances change into one or more new substances. Reactant-substance at the start of the reaction. Product-substance produced in a reaction. |
| How can one recognize a chemical change? | 1) energy is absorbed or given off as hear or light 2) Change in order 3) Production of a gas 4) Formation of a solid 5) Color change (can be physical or chemical) change in color is due to chemical reaction and change in color intensitiy is physical. |
Created by:
CoraEvelynnBaker
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