CHEM 1411SAMPLE eXAM 1

The answer to  6.626*10^-34 Js (7.40*10^6 m/s)(9.11*10^-28 g)  is  9.83*10^-17 g right? That's the answer I got but my digital homework says it's wrong, but like, all my math is checking out that it should be what I got?

Please answer all questions and show calculations For the image attached For 1. a Mass of metal: Trial 1 is 35.0228 g Trial 2 is 35.0915 g Trial 3 is 34.0821 g Mass of water: Trial 1 is 20.0177 g Trial 2 is 20.0250 g Trial 3 is 20.0168 g For delta t of water: Trial 1 is 15.5 C Trial 2 is 15.7 C Trial 3 is 15.1 C For delta t of metal Trial 1 is 80.1 C Trial 2: 80.2 C Trial 3: 79.5 C For B my calculated Specific heat is: Trial 1 is 0.462 Trial 2 is 0.467 Trial 3 is 0.466

A 11 oz. can of soda contains 26 mg of sodium.  How many atoms of sodium are found per mL of the solution?  1 oz. = 29.57 mL Report your answer using scientific notation (e.g., 1.23e15). Report your answer with two significant figures. Do not report units.

An experiment with a pycnometer resulted in the following data:  Mass of Pycnomter = 25.428 g Mass of Pycnometer filled with water = 44.021 grams Mass of Pycnometer filled with liquid X = 41.421 grams a) What is the specific gravity of liquid X?  b) If methanol (Specific Gravity = 0.790) was used rather than water in measuring the density of irregular objects, how would that affect the result? Why?

1. All answers to be entered via short answer are in the NUMERICAL FORMAT and presented up to the 3rd decimal place. ADD TRAILING ZEROS if necessary, to complete your answer. NO NEED TO INCLUDE THE UNIT for now.For uniformity of answers, please be guided by the following examples:- If your answer is 5.627594, enter 5.628- If your answer is 3.129934, enter 3.130- If your answer is 8.38, enter 8.380- If your answer is 1.2, enter 1.200- If your answer is 25, enter 25.000- If your answer is less than the value of 1, always place a zero before the decimal point (E.g.: if 0.5, enter 0.500)2. In cases for answers in the EXPONENTIAL FORMAT, please be guided by the following examples and format:- Do not convert your answer to decimal format- If your answer from the calculator is 1.23454566 x 10E-4, enter 1.235x10^-4 (no spaces in between)- If your answer from the calculator is 7.379566 x 10E-5, enter 7.38x10^-5 (no spaces in between)3. The ATOMIC MASSES should be rounded to the NEAREST WHOLE…

The experiment involves diluting a 16% sugar solution, prepared by dissolving 16 g of sugar in 100 mL  water.  Three different solutions are prepared by mixing the 16% sugar solution with various volumes of water.Make appropriate choices from the dropdowns.  Work from left to right.  Each answer can be calculated from numbers to the left of it in the row. The objective is to calculate the number in the right-hand most column in each row (% sugar in the solution). 16% sugar solution taken / mL water added/ mL diluted solution / mL Dilutionfactor % sugarin diluted solution 25 25                             [ Select right answer]                          ["50", "25", "100", "150"]                                        [ Select right answer]                          ["1", "0.5", "2"]                                        [ Select right answer]                          ["8", "50", "12.5", "25"]            25 8.3                             [ Select right answer]…

Professor Gomez's dogJasper, is a very anxious little guy, so she baked him some treats that contain melatonin to help calm him down. The treats are quite small, and each one contains 150 of melatonin Jasper's veterinarian recommended he take milligrams of melatonin per of body weight per day Jasper weighs exactly 15 lbs. How many of the melatonin containing treats is he allowed to have in one day? Note : 2.20 lb=1 log

Show your work, use general chemistry rules for significant figures. 6. A solution is made by dissolving 1.0 x 10–4 mol of Na3PO4 in 200.00 mL of water. Then 0.25 mL of 0.200 F HCl is added to the solution. H3PO4 ⇌ H+ + H2PO4–                               Ka1 = 7.11 x 10–3     H2PO4– ⇌ H+ + HPO42–                             Ka2 = 6.34 x 10–8 HPO42– ⇌ H+ + PO43–                               Ka3 = 4.17 x 10–13 (a)  What is the pH of the resultant solution? (b) An additional 0.75mL of 0.200 F HCl is added to the solution from the end of part (a). What is the pH of the resultant solution? (c) Finally, an additional 0.50 mL of 0.200 F HCl is added to the solution from the end of part (b). What is the pH of the resultant solution?

Daniel Harris has always enjoyed eating tuna fish. Unfortunately, a study of the mercury content of canned tuna in 2010 found that chunk white tuna contains 0.6 ppm Hg and chunk light tuna contains 0.14 ppm2. The U.S. Environmental Protection Agency (EPA) recommends no more than 0.1 μg Hg/kg body weight per day. A person weighs 65 kg. How often may the person eat a can containing 6 ounces (16 oz=1 lb) of chunk white tuna so that they do not average more than 0.1 μg Hg/kg body weight per day? The person can consume one 6 oz can of chunk white tuna every ______ days.   If the person switches to chunk light tuna, how often can they eat one can?   The person can consume one 6 oz can of chunk light tuna every _______ days. S. L. Gerstenberger, A. Martinson, and J.L. Kramer, "An Evaluation of Mercury Concentrations in Three Brands of Canned Tuna," Environ. Toxicol. Chem. 2010, 29, 237.

1) State your interpretation of the meaning of the slope for the first graph you prepared of Volume of Steel Nuts (mL) versus Number of Steel Nuts. Hint: Understanding the meaning of a slope involves several factors: the units which are a ratio of the y axis units over the x axis units, the interpretation of the slope as “number of the y axis units for every one of the x axis units” and the concept that constructing the best line or curve that follows the trend in the data is a sort of averaging of the random error throughout the data.

A 75.42 % mass solution of naquadah (FM naquadah = 160.28 g/mol) in water has a density of 1.175 g/mL.  Find the molarity of naquadah in this solution. How many mL of 7.791 M naquadah should be diluted to a volume of 300.00 mL to give a solution with a concentration of 3.03 M? A naquadah solution has a molarity of 0.43118023 M with a relative uncertainty of 0.12760507%.  What is the concentration and its absolute uncertainty rounded to an appropriate number of digits?   a. 0.43 +/- 0.06 M b. 0.431 +/- 0.001 M c. 0.4312 +/- 0.0006 M d. 0.43118 +/- 0.00006 M e. 0.431180 +/- 0.000013 M

Can you explain the concept? How do I do the calculations? For example, where did the 4x2 came from?

B. Density of Liquid 1. Obtain a sample of distilled water (any quantity of your choice) anddetermine its mass and volume. Record your data on table 3 in theexperimental report 2. Calculate the density of the water sample using equation 1 Substance     Density (g/mL)    Substance     Density (g/mL)Aluminum       2.7                     Lead                         11.3Brass                8.4                      Zinc                     7.1 Copper           8.9                           Cork                        0.26Tin                  7.3                   Silver                                           10.5Bone             1.80                  Rhodium                              12.4Iron             7.9                         Platinum                                     21.45   Density of Liquid Density can be determined in the laboratory by measuring the mass and volume ofa substance. To measure the density of a liquid, first measure the mass of a clean,dry beaker. Then add…

Having trouble with conversion factors. The question says write conversion factors ( as ratios) for  a)kilometers in 1 mile b) Liters in 1 cubic foot c) grams in one ounce I need to understand exactly where i get the conversions from.  One of the questions I looked up in the book said to do yards in a meter and the answer is 1.0936/1m. The conversion i see in the book says 1m=1.094 yd=39.36 in These problems come out of Chemistry Atoms First 2nd edition Chapter 1

A volume of 25.00 mL of the original solution was diluted to a total volume of 100.0 mL and then 10.00 mL of that diluted solution was diluted to a total volume of 15.00 mL to make the sample for analysis.  If a student in lab found that the solution for spectroscopic analysis had a concentration of (4.0x10^-5) M, what was the concentration of the original solution, in units of M?

Be sure to answer all parts. Fluoridation is the process of adding fluorine compounds to drinking water to help fight tooth decay. A concentration of 1 ppm of fluorine is sufficient for the purpose (1 ppm means one part per million, or 1 g of fluorine per 1 million g of water). The compound normally chosen for fluoridation is sodium fluoride, which is also added to some toothpastes. Calculate the quantity of sodium fluoride in kilograms needed per year for a city of 50,000 people if the daily consumption of water per person is 105.0 gallons. (Sodium fluoride is 45.0 percent fluorine by mass. 1gallon =3.785 L; 1 ton = 2000 lb; 1 lb = 453.6 g; density of water = 1.0 g/mL) Enter your answer in scientific notation.

After the storm in February, New York City saw a total of 26 inches of snow, making 2021 the 8th most snowiest year. 13-inches (in.) of snow is equivalent to 1-inch of rain (per square foot). That is about 0.623 gallons (gal.) of water. The size of New York City including its boroughs is 302.6 square miles. This means that the total snowfall in 2021 has blanketed the Big Apple with 5,255,628,000 gallons of water!!! onversion Chart: 1 gal. = 3.78541 liters (L) Kf of water = 1.86 °C/m Density of water = 0.997 g/mL Molar Mass of NaCl = 58.44 g/mol   Answer the following: 1.) In order to depress the freezing point of water by at least 0.01 degrees Celsius (ºC), how many kilograms (kg) of salt is required to treat the entire city? 2.) Would you recommend increasing the amount of salt? Why or why not? (HINT: think molality) Extra Credit: Convert the kilograms of salt to tons (tn.) (1 tn. = 907.185 kg)

A 76.00 pound flask of mercury costs $148.50. The density of mercury is 13.534 g/cm3. Find the price of the cubic mercury by calculating intermediate values. What is the price of  one pound of mercury? What is the price of 1 g of mercury? What is the price of 1cm3 of mercury? What is the price of 1 in3 of mercury?

use the chart if needed    What is the density of a liquid, in g/mL, which has a mass of 1500 mg when the reference liquid used is water with a density of 0.9967 g/mL and a mass of 3 g?        A) 4.9835 B) 1.9934 C) 0.4984 D) 0.1993   The experimental Molecular Weight of benzene obtained in one of our class experiments is 77.9924. what is the percentage error?      A) 9.754 x 10^-3 B) none of the choices are correct C) 9.744 x 10^-3 D) 9.745 x 10^-3

B. Density of Liquid 1. Obtain a sample of distilled water (any quantity of your choice) anddetermine its mass and volume. Record your data on table 3 in theexperimental report 2. Calculate the density of the water sample using equation 1. Substance  Density (g/mL) Substance  Density (g/mL) Aluminum 2.7 Lead  11.3 Brass 8.4 Zinc 7.1  Copper 8.9 Cork 0.26 Tin 7.3 Silver 10.5 Bone 1.80 Rhodium 12.4 Iron 7.9 Platinum 21.45

If X and Y are quantities that are related to each other by inverse proportion, what will the value of X become when the value of Y is increased by a factor of five? Select one: a. It will also increase by a factor of 5. b. It will decrease by a factor of 5. c. It will stay the same. d. There is no way to tell.

Chemistry A student performed the same experiment as you. The following data was recorded in their lab notebook. Mass of Mg, g Final buret volume, mL Pbarometric, in Hg PH2O, torr T, °C 0.035 41.86 27.02 17.5 20.0 Calculate the student's experimental value of R. Round your answer to four places after the decimal.

My Data: Ensure Nutrition Shake: 0.038 g/mL Class Data: Group 7:Ensure: 0.0233 g/mL Is 0.0233 g/mL accurate, precise, both, or neither?