a. Convert 91.1 m to kilometers (km). km b. Convert 96.9 km to meters (m). m c. Convert 79.2 kg to grams (g). g d. Convert 65.4 L to milliliters (ml). mL e. Convert 34.6 dL to liters (L). dL f. Convert 4130 L to cubic centimeters ().

6. Urea (CH4N₂O) is a common fertilizer that is synthesized by the reaction of ammonia (NH3) with carbon dioxide (CO₂). 2 NH3 + CO₂--> CH4N₂O + H₂O In an industrial synthesis of urea, a chemist combines 1.364 X 10^5 g of NH3 with 2.114 X 10^5 g of CO₂. The reaction was performed and 1.684 X 10^5 g of urea was obtained. Determine the limiting reactant, theoretical yield, and percent yield for the production of urea.

3. Briefly discuss the safety precautions related to this experiment. (chemical and equipment related)

TITLE PAGE INTRODUCTION: (the usual...) clearly state the purpose and explain the chemistry(i.e. define the Law !) - do not simply list calculations PROCEDURE: in PARAGRAPH form (3rd person past tense !)... explain the actual procedure done - don't just copy from the lab manual DATA: all data is contained on the lab computer printout - attach the printout HERE ! CALCULATIONS: show equations and calculations of all predicted volumes and % oxygen - give equations used, plug in data, show calc and final result... use units, sig figs & labels GRAPH: report quality graph...you can use the lab graph as long as you followed the directions given on lab handout DISCUSSION: as usual...state results (remember there were 2 parts to this experiment...hence, 2 results)...Give the true balanced equation for the reaction... compare results to expected & comment...give 3-4 sources of experimental error and how those errors would affect the results.

Balancing Equations Practice Worksheet 1) ___NaNO3+ ____ Pbo → _____Pb(NO3)2 + ____Na₂O 2) ___Agl+ ____Fe2(CO3)3 → ____Fel3 + ____Ag₂CO3 3) ____C₂H4O₂ +___0₂ → ___CO₂ + ___H₂O 4) ____ZnSO4+ ____ Li₂CO3 → ____ ZnCO3 + ____ Li2SO4 5) ____ V₂05 + ____ Cas → ____ CaO + ____ V₂S5 6) ____ Mn(NO₂)2 + ____ BeCl₂ → ____ Be(NO2)2 + ____ MnCl₂ 7) ____ AgBr + ____ GAPO4 → ____ Ag3PO4 + ____ GaBr3 8) ____ H₂SO4 + ____ B(OH)3 → ____ B₂(SO4)3 + ____ H₂O 9) ____ S8+ ____ O₂ → ____ SO₂ 10) ____ Fe+____ AgNO3 → ____ Fe(NO3)2 + ____ Ag

How many molecules are equal to 7.21 moles of methane? (CH4)

Consider the 10 most abundant elements in Earth’s crust, listed from most to least abundant: Oxygen, Silicon, Aluminum, Iron, Calcium, Sodium, Magnesium, Potassium, Titanium, Hydrogen For each element other than iron, draw the corresponding orbital configurations and indicate the number of protons and neutrons in the nucleus of the most abundant isotope. Group electrons in the principal shells (i.e., 1, 2, 3, 4; note shells 1-4 are labeled alphabetically as K, L, M and N in x-ray notation). You can ignore the subshells (i.e., s, p, d, f). Iron is shown as an example: The orbital configuration is 1s22s22p63s23p64s23d6, so there are two electrons in the first shell (K), 2+6=8 electrons in the second shell (L), 2+6+6=14 electrons in the third shell (M), and two electrons in the fourth shell (N). The atomic number is 26, so there are 26 protons (and electrons). The atomic mass is 55.85, so we round that up to 56; this is also the mass number of the most abundant isotope, which means there are 56-26=30 neutrons.

Determine the number of valence electrons in a neutral atom of Nitrogen: 

Investigation #1: Are these objects made of the same material? ■ Each group will have three objects to evaluate. ■ Each object's shape and color should be noted. Some are a metal and others are plastics, such as nylon, polyethylene, or neoprene. ■ you should develop two methods for determining the density of your samples. Collect and analyze your data

Examine the following diagram illustrating a theoretical portion of the chart of the nuclides. The purple boxes are isotopes that are unstable and will undergo beta decay; the light blue boxes are stable isotopes that do not undergo decay. The white or empty portions are forbidden proton + neutron combinations. Each isotope has been given a letter; the isotopes that are highlighted in red are the ones that you are asked questions about below. a. For each isotope C, I, O and P indicate whether this is an isotope formed by the r-process or the s-process. b. For 2 pts of extra credit, can you identify an isotope on this chart that could be made by either the s- or the r-process? c. Draw the s-process path across the chart, starting at the “start here” box and ending at the “end here” box.