Until 200 yr ago, manufactured iron contained charcoal produced from freshly cut wood that was added during the smelting process. As a result of this practice, older samples of iron can be dated accurately using the carbon-14 method. An archaeologist found a cast iron specimen that she believed dated to the period between 480 and 221 BC in Hunan, China. Radiocarbon dating of the sample indicated a 24% reduction in carbon-14 content. Was the archaeologist correct?

## What is the percent of acid that has undergone ionizationif the freezing point of a 0.106m CH3COOH solution is -0.323 degrees celcius, what is the percent of acid that has undergone ionization? |

## How many grams of nh3 can be producedA 4.07 L sample of H2O(g) reacts at a temperature of 375°C and a pressure of 679 mm Hg. How many grams of NH3 can be produced? |

## Explain water bath in the surroundings increasesCalculate q if the temperature of a 1.00 kg water bath in the surroundings increases by 1.25 Celsius degree. |

## What is the molecular formula of a compund that containsMolecular Formula of a Compound from Percent Composition and Molar Mass, What is the molecular formula of a compund that contains 42.87%carbon, 3.598% hydrogen, 25.00% nitrogen |

## Why the molecule has a highWhen the electron cloud of a molecule is easily distorted, the molecule has a high ? |

## What is the new volume of the argon gasA sample containing 0.35 mol argon gas at a temperature of 13 C and a pressure of 568 torr is heated to 56 C and a pressure of 897 torr. A. What is the original volume of the gas? B. What is the new volume of the argon gas? |

## How many grams of cah2 are neededHow many grams of CaH2 (Molar Mass = 42.1 g/mol)are needed to generate 10.0 L of H2 gas if the pressure of H2 is 769 torr at 28.0°C? |

## How many grams of ethanol should be mixedthe density of an aqueous ethanol solution is .789 g/mol. How many grams of ethanol should be mixed with water to make 225mL to make a 4.5% ethanol solution? |

## The extracellular concentration and the membrane potentialthe cytoplasmic concentration is 0.4 micromolar, and the extracellular concentration is 1.5 micromolar, and the membrane potential is -60 mV? |

## How many moles of glucose, c6h12o6 can be burnedhow many moles of glucose, C6H12O6 can be burned when 60.0 mol of O2 is available? |

## State and equation that represents the reactionWrite and equation that represents the reaction of 2% ethanolic PBP solution with 4-methylcyclohexene and name the product |

## State what is the final temperature when thermal equilibriumA 45.5 g sample of copper at 99.8 degrees C is dropped into a beaker containing 152 g of water at 18.5 degrees C. What is the final temperature when thermal equilibrium is reached? |

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