CHEM FINAL
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66 terms
Terms | Definitions |
|---|---|
 A chemical formula for a molecular compound represents the composition of | a molecule |
| How many atoms of fluorine are present in a molecule of carbon tetrafluoride, CF4? | 4 |
| What is the formula for zinc fluoride? | ZnF2 |
| what is the formula for the compound formed by lead (II) ions chromate ions | PbCrO4 |
| what is the formula for barium hydroxide | Ba(OH)2 |
| name of the compound Fe(NO2)2 | Iron II nitrite |
| what is the formula for sulfur dichloride | SCl2 |
| the molar mass of MgI2 | 278.11 |
| What is the percentage composition of oxygen in H2O | 88.8% |
| A solid produced by a chemical reaction in solution that separates from the solution is called | a precipitate |
| In writing a chemical equation that produces hydrogen gas, the correct representation of hydrogen gas is? | H2 (g) |
| What is the small whole number that appears in front of a formula in a chemical equation | Coefficient |
| To balance a chemical equation it may be necessary to adjust the | coefficients |
| According to the law of conversation of mass,the total mass of the reacting substances is | always equal to the total mass of the products. |
| in an equation, the symbol for a substance in water solution is followed by | (aq) |
| When the equation Fe3O4 + AL (yields) Al2O3 + Fe is correctly balanced, what is the coefficient of Fe? | 9 |
| Which coefficient correctly balance the formula equation CaO2 + H2O (yields) Ca(OH)2? | 1,1,1 |
| In what kind of reaction do two elements combine to form a new compound? | synthesis reaction |
| In what kind of reaction does a pure element replace a similar element in a compound? | single-replacement reaction |
| In what kind of reaction does a single compound produce two or more simpler substances? | decomposition reaction |
| In what kind of reaction do the ions of two compounds exchange places in aqueous solution to form two new compounds? | double-replacement reaction |
| An active metal and a halogen react to form a | salt |
| According to the kinetic-molecular theory, which substances are made of particles? | all mater |
| example of gas diffusion | spraying perfume |
| by which process do gases take the shape of their container | expansion |
| If a gas with an odor is released in a room, it quickly can be detected across the room because it | diffuses |
| The density of a substance undergoes the greatest change when the substance changes from a | liquid to a gas |
| what is an example of effusion | poking a small hole in a tire |
| what does the constant bombardment of a gas molecules against the inside walls of a container produce | pressure |
| what instrument measures atmospheric pressure | barometer |
| standard pressure is the pressure exerted by a column of mercury exactly | 760 mm high |
| The volume of a gas is 400.0 ml when the pressure is 1.00 atm. at the same tempurature, what is the pressure? | .20atm |
| At 7.0ºC, the volume of a gas is 49 mL. At the same pressure, its volume is 74 mL at what temperature? | 150.0 dec |
| The pressure of a sample of gas increases from 450. mm Hg to 500. mm Hg. If the volume is constant and the temperature of the gas was 0.0ºC,what is the new gas temperature | 30.3 C |
| A 30 L sample of gas exerts 200 mm Hg pressure at 10 Celsius What volume does the gas have at 300 mm Hg and 25 Celsius? | 21 L |
| A pressure of 745 mm Hg equals | 745 torr. |
| heterogeneous mixture | a mixture in which pure substances are unevenly distributed throughout the mixture |
| homogeneous mixture | a mixture in which substances are evenly distributed throughout the mixture |
| which mixture contains visible particles that settle out unless the mixture is stirred. | suspension |
| which mixture contains particles that are in a dispersed phase and do not settle out | Colloid |
| A metal solution is an | Alloid |
| Colloids | particles that are intermediate in size between those in solutions and suspensions form mixtures known as colloidal dispersions |
| How can the Tyndall effect be used to distinguish between a colloid and a solution? | a solution and a colloid |
| A substance whose water solution is a poor conductor of electricity is a(n) | non electrolyte |
| Increasing the surface area of the solute | increases the rate of dissolution |
| If the amount of dissolved solute in a solution at a given temperature is greater than the amount that can dissolve at that temperature the solution is said to be | supersaturated |
| If the amount of dissolved solute in a solution at a given temperature is less than the amount that can dissolve at that temperature the solution is said to be | unsaturated |
| pressure has the greatest effect on the solubility of | gases in liquids |
| Henry's law relates | Pressure to gas-liquid solubilty |
| Effervescence is the | escape of a gas from a gas-liquid solution |
| as temperature increases,solubility of gases in liquids | Decreases |
| What is the molarity of a solution that contains 0.202 mol KCl | .0253M |
| What is the molarity that contains 31.0 g of HCl in 5.00kg H2O? | 0.17 |
| Acids taste | sour |
| acids generally release H2 gas when they react with | active metals |
| bases taste | bitter taste |
| bases feel | slippery |
| What is the formula for chlorous acid? | HClO2 |
| what acid is manufactured in largest quantity | Sulfuric acid H2SO4 |
| the acids produced in largest quantity are primarily used to manufacture | fertilizer paper petroleum products car batteries |
| which acid is used in batteries | Sulfuric acid H2SO4 |
| what acid is produced in the stomach | Hydrochloric acid HCl |
| What acid is used to pickle metals,process food,and activate oil wells | Hydrochloric acid HCl |
| what acid is found in vingear | Acetic acid |
| The Ph scale in general use ranges from | 0 to 14 |
| A solution whose pH is 5 is | acidic pH of 8 basic and a pH of a neutral 7 |
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