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chem lab test
| Question | Answer |
|---|---|
| SDS | safety data sheet |
| is a sds required by law | yes |
| GHS stands for | globally harmonized system of classification and labeling of chemicals |
| SDS is divided into how many sections | 16 |
| Section 2 | hazards |
| Hazards can be communicated in the following ways | pictograms, signal words, hazard statements, and precautionary statements |
| Danger means a hazard is | severe |
| warning means a hazard is | less severe |
| hazard statements | summarize specific hazards |
| precautionary statements | summarize actions to prevent or minimize adverse effects of handling a chemical |
| section 3 | composition of a chemical |
| section 4 and 5 | detailed information on first aid and firefighting measures |
| section 9 | summarizes known physical and chemical properties |
| all remaining sections (every section besides 2, 3, 4 and 5, and 9) include what info | handling, storage, disposal info, accident response, other regulatory information |
| toxicological information (section 11) indicates | health effects |
| ecological information (section 12) indicates | environmental impact if released |
| flammable | easily ignited and burns readily |
| corrosive | causes destruction of live tissue |
| irritant | causes reversible damage such as swelling |
| oxidizer | enhance or cause combustion of other substances |
| carcinogen | induces or increases the incidence of cancer |
| environmentally damaging | aquatic hazard |
| explosive | may produce damaging release of energy when subjected to heat or shock |
| glassware can be used to | measure, create solutions, and hold items |
| measurements consist of what two parts | number and a unit |
| a unit is | quantity used as standard of measure |
| King henry died drinking chocolate milk | kilo (1000), hecto (100), deka (10), deci (0.1), centi (0.01), milli (0.001) |
| three factors considered when determining validity of a measurement | accuracy, precision, sig figs |
| example of a factor used in determining accuracy and precision of a measurement | quality of equipment |
| precision refers to | how close measurements of the same item are |
| accuracy refers to | how close measurements are to true/accepted value |
| meniscus | curve at top of liquid (convex or concave) |
| when measuring a liquid you should read | bottom of meniscus |
| dimensional analysis is also known asq | factor label method |
| conversion factor | means of converting between units (based on direct relationship between units) |
| dimensional analysis is used to | convert units in measurements and calculations |
| solubility rule | likes dissolves like |
| physical property | characteristic of a substance used to identify and distinguish it from other substances |
| a physical property can be observed WITHOUT | changing composition of substance |
| quantified physical properties | boiling/melting point, density, solubility |
| non quantified physical properties | odor, color, state of matter |
| solvent | medium in which a solute is dissolved or mixed |
| A solvent can be a | liquid, gas, or solid |
| solute | any substance dissolved in the solvent |
| a solute can be a | gas or solid |
| aqueous solution | water is solvent |
| non aqueous | anything but water is solvent |
| solid solution | solvent is solid |
| dilute solution | small solute to solvent ratio |
| concentrated solution | large solute to solvent ratio |
| a dilute solution would contain ____ solute per unit volume than concentrated solution | less |
| solubility | maximum weight of a substance that dissolves in given volume of solvent at a specific temperature |
| solubility is ____________ dependent | temperature |
| solution equation | homogenous solute mixture (smaller amnt) + solvent (larger amount) = solution |
| homogenous mixture | uniform composition throughout |
| the solubility of a substance is dependent on | types of bonds in molecules and attractions between molecules |
| temperature can be used to make more solute dissolve, true or fa;se | true |
| miscible | liquid dissoves in another liquid |
| immiscible | liquid doesnt dissolve (ex oil and water) |
| polar solvents are best for | polar and ionic solutes |
| nonpolar solvents are best for | nonpolar solutes |
| dissolution of a solid in a liquid is dependent on | interxns betweeen solid molecule AND liquid molecules |
| in order for dissolution to take place, what must occur | solute-solvent attrxns must be strong enough to overcome solute -solute attrxns |
| water is polar or non polar | polar |
| methanol is polar or nonpolar | polar due to OH group |
| vegetable oil is polar or nonpolar | nonpolar due to many c-h bonds |
| sodium chloride is polar or nonpolar | polar (large elctronegativity diff between ions) |
| sodium bicarbonate is polar or non polar | polar (large elctronegativity diff between ions) |
| silicon dioxide (sand) polar or nonpolar | nonpolar bc molecule is symmetrical |
| ethanol polar or nonpolar | polar due to OH group |
| sucrose polar or nonpolarq | polar due to OH groups |
| density is defined as | the amount of mass contained in a given volume at a specific temperature |
| density formula is | mass/volume |
| volume by displacement | inserting object into glassware increases volume by specific value that represents volume of object |
| volume by displacement equation | v(metal) = v(final) - v (initial) |
| qualitative means | observation based |
| quantitative means | deals with exact numbers and measurements |
| density would be | quantitative |
| solubility can be | qualitative |
Created by:
taylerw613
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