Calculate the molar mass of (a) a gas that has a density of 1.98g/L at STP and, (b) an unknown liquid for which 3.33 liters at STP is found to weigh 10.88g?

Explain the caffeine is extracted and dissolved in water : A 16 ounce specialty coffee drink contains 216 mg caffeine. If all the caffeine is extracted and dissolved in an equal amount of water, what is the pH of the solution. What is the percent ionization. |

Determine the number of revolutions : Determine the number of revolutions through which a typical automobile tire turns in 1 yr. Suppose the automobile travels 13000 miles each year on tires with radius 0.260 m |

Find the range of sound frequencies heard by the student : In a classroom demonstration, a speaker was mounted on the end of a 50.0 cm long arm, Calculate the range of sound frequencies heard by the students in the classroom |

Definition of normal-abnormal vary from culture to culture : How does the definition of normal and abnormal vary from culture to culture? Can you think of examples in our culture where what is considered normal by some is considered abnormal by others? |

Compute the molar mass of a gas that has a density at stp : Calculate the molar mass of (a) a gas that has a density of 1.98g/L at STP and, (b) an unknown liquid for which 3.33 liters at STP is found to weigh 10.88g |

Find will the driver be able to stop in time : Reaction time is the shortest time interval elapsed after the driver of a car decides to apply the break. (For example, the time wasted immediately after the driver sees a child standing on the road). Will the driver be able to stop in time |

What amount of dividends should jim declare as income : What amount of dividends, if any, should Jim declare as income this year? Explain. |

Explain converted into 3 nitrophthalhydrazide by reacting : 3-nitrophthalic acid will be first converted into 3 nitrophthalhydrazide by reacting with 25% hydrazine. Reduction of the nitro group to an amino group with sodium hydrosulfite affords luminol. |

Calculate the initial speed of the lighter car : A 1000- kg car collides with a 1200- kg car that was initially at rest at the origin of an x-y coordinate system. What was the initial speed of the lighter car (in km/h) |

## Compute the average decomposition rate of the organic acidCompute the average decomposition rate of the organic acid - Average decomposition rate of the organic acid |

## What percent of the pb2+ ions remainA solution is 0.0100 M in Pb2+ ions. If 0.103 mol of solid Na2SO4 is added to 1.00L of this solution (with negligible volume change), what percent of the Pb2+ ions remain in solution. |

## Explain iron oxide to make aluminum oxide and molten ironIn a thermite reaction, powdered aluminum reacts with iron (III) oxide to make aluminum oxide and molten iron What mass of aluminum oxide is produced when 2.3 grams of aluminum reacts with iron (III) oxide |

## Compute the density of the silver metalSilver metal crystallizes in a cubic closest packed structure. The face centered cubic unit cell edge is 409 pm. Calculate the density of the silver metal. |

## What is the molar mass of the unknown gasA sample of an unknown gas effuses in 10.5 min. An equal volume of H2 in the same apparatus under the same conditions effuses in 2.07 min. What is the molar mass of the unknown gas? |

## Explain the characteristic color to certain blue-green algaeEnzyme X is a highly pigmented protein that imparts the characteristic color to certain blue-green algae. It also facilitates a reaction necessary to the survival of this species |

## Explain a strip of lead metal in a solution of pb(no3)2A voltaic cell consists of a strip of lead metal in a solution of Pb(NO3)2 in one beaker, and in the other beaker a platinum electrode immersed in an NaCl solution, with Cl2 gas bubbled around the electrode. The two beakers are connected with a sa.. |

## What is the equilbrium constantsIf the partial pressures of N2, O2 and NO at equilibrium are 1.5 atm, 2.5 atm and 0.75 atm respectively, what is the equilbrium constants |

## Explain a mixture of water and carbon dioxideA mixture of C3H8 and C2H2 has a mass of 2.0 . It is burned in excess O2 to form a mixture of water and carbon dioxide that contains 1.5 |

## Define the rydberg equation to calculate the wavelengthUse the rydberg equation to calculate the wavelength in nm of the photon when an electron in a hydrogen atom undergoes a transition from n=6 to n=2 |

## Explain alcohols can be oxidized by chromic acid derivativesAlcohols can be oxidized by chromic acid derivatives. One such reagent is pyridinium chlorochromate, (C5H5NH )(ClCrO3-), commonly known as PCC |

## Explain the vapor pressure of water at this temperatureThe volume of a certain gas sample is 235 mL when collected over water at a temperature of and a pressure of 698 mmHg. What will be the volume of this gas sample when measured dry at a standard pressure? The vapor pressure of water at this tempera.. |

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