A 2.5-gram sample of french fries is placed in a calorimeter with 500.0 g of water at an initial temperature of 21 °C. After the combustion of the french fries, the water has a temperature of 48 °C. What is the caloric value (kcal/g) of the french fries?

Give the name and symbol for your favorite element and briefly explain why it has a special place in your heart. Make sure you spell the name correctly and give the proper symbol for the said element.  Example: I like xenon (Xe). It has a cool name, and balloons filled with xenon drop like rocks. Not to mention those bright headlights on expensive cars.

Now that you have drawn the Lewis structure, give the following details about Formaldehyde (CH2O) continued bonding electron pairs on O atom: nonbonding electron pairs on O atom: shape of the molecule: hybridization of the central atom:  

A highly publicized assassination of a Russian defector took place in London in November of 2006. Alexander Litvinenko fell ill on November 1st and died on November 23rd of that year. His illness was sudden and unexplained. After his death, traces of the radioactive isotope polonium 210 (210Po) were found in the tissues of his body. It appears that the radioactive poison was administered in Litvinenko’s tea, and he died of radiation poisoning. His body contained 10.0 micrograms of 210Po (the element Po with an atomic mass of 210.0), which is 200 times the lethal ingested dose of 50. nanograms. How many atoms of 210Po does 10.0 micrograms represent? One gram is 109 nanograms and 106 micrograms.    Poisoning of Alexander Litvinenko Note: Show all work for this question for full credit. Label the question number clearly and circle or highlight all answers. You will upload your work at the end of the exam. The number of significant figures you use in your answer is important. There is an extra 1/2 point available for using the right number of significant figures in your final answer.

Written Work Make sure to show all work for the following questions, labeling each question and answer clearly. You will take one or more pictures of this document to upload at the end of the exam.

There are three types of molecular motion that gas molecules possess. Which of the following types of molecular motion do gas molecules possess but liquids and solids do not?

The boiling point of CH4 is −162 °C and the boiling point of CCl4 is 77 °C. Identify the principal intermolecular forces in each of these compounds and briefly explain the large difference in boiling points. Submit your response using the text editing tools in the box below.

The name of the SO42- ion is ________.

Complete the information in the chart below, filling in the empty boxes. Assume that all the atoms are uncharged; that is, they are not ions. For superscripted numbers in elemental symbols, enter them as regular numbers. For example, 131Xe would be written 131Xe.   Elemental Symbol 195Pt Number of Protons 92 Number of Neutrons Number of Electrons 50 Mass Number 238 118  

NH3 molecular shape: hybridization of the central atom write in normal characters sp, sp2, sp3 name: number of sigma bonds: number of pi bonds: