Concept explainers
Interpretation:
The correct conversion factor for solving the problem “
Concept Introduction:
Measurement is the measure of quantity, capacity, dimensions or extent of something. Mass, length, pressure, temperature, volume, time and concentration are some common type of measurements. English system and metric system are two types of measurement systems that are in use in the United States. Measurement wise both English system and metric system are precise. There are instance where measurements from one system has to be changed to their equivalent in other system. This is called the conversion factor. These conversion factors always appear as pairs. For example
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Chapter 2 Solutions
General, Organic, and Biological Chemistry
- Question: A 795-centigram sample of borax was placed in a certain volume of water at 25 °C. After adding the sample, the graduated cylinder was read at 35 milliliters, where a rise of 2.7 milliliters was observed. 1. What is the weight of sample in grams? Your answer here will be used for the next item(s). 2. What was the initial volume of water in milliliters? 3. What will be the weight of displaced water in grams? Your answer here will be used for the next item(s). 4. What is the specific gravity of the solid? Your answer here will be used for the next item(s). 5. What will be its specific volume?arrow_forwardWhich of the following is an incorrect conversion factor? a. 3 ft/1 yd b. 36 in./l yd c. 12 ft/1 mile d. no correct responsearrow_forwardTEST #4 Q4arrow_forward
- Sarah bought a neti pot from©. After using up the salt packets she decided to make one from scratch at home. After some Internet research she found out that for every 8 ounces (oz.) of water, she should mix in 1/4 teaspoon (tsp.) of pure non-iodized salt (sodium chlodide, NaCl). Conversion Chart: 1 oz. of water = 29.5738 mL Density of Water = 0.997 g/mL 1 tsp. of salt = 5.9985 g Answer the following: 1.) What will be the molarity (M) of the solution? 2.) What will be the molality (m) of the solution? (Use density of water to find kg of water). 3.) What is the mole fraction (X) of salt in the solution? Extra Credit: Sarah is unsure about the type of water to use (tap, bottled, or distilled). What do you recommend and why?arrow_forward6. Student JB filled the10 mL -volumetric flask with distilled water. Afterwards he transferred the measured liquid into a 25.00 ml graduated cylinder having an increment of 0.5mL. The volume reading obtained was 9.55 mL. Compute for the percent error(%). a 0.45 b 0.5 c 4.5 d 5arrow_forwardA pipet delivers 10.9 mLmL , 10.1 mLmL , and 10.9 mLmL in consecutive trials. Find the mean volume of the samples. = Answer = 10.6 mL Part B What is the average deviation from the mean for the above samples?arrow_forward
- Two students measured the density of water three times each. Their results are shown below. Trial Student 1 Student 2 1 0.953 g/mL 1.102 g/mL 2 0.949 g/mL 1.005 g/mL 3 0.956 g/mL 0.901 g/mL9. Calculate the standard deviation in the measurements for student 1 and then do the same for student 2. Show your workarrow_forward1. How many sig figs should the result of the following have? Xs are digits that are purposefully not given. 16.XX/(2.7 + 9.X) 2. A student performed four trials to determine the molar mass of butane in Gas Laws lab. The average of the four trials was 68.7 g/mol and the standard deviation was 8.2 g/mol. How should his result be reported in a "mean +/- st. dev." format? Please make sure that you have proper number of sig figs. a) 61 g/mol to 77 g/mol b) 68.7 +/- 8.2 g/mol c) 69 +/- 8 g/mol d) 68.7 +/- 8 g/mol 3. Which of the following is NOT an acid? ( can be more than one choice) a) HCl(aq) b) H2CO3(aq) c) HNO3(aq) d) All are acids e) CH3COOH 4. How many moles of NaOH are there in 22.5 mL of 0.97 mol/L NaOH solution? Keep 3 decimal places for your answer. 5. How many moles of NaOH are needed to neutralize 0.74 mol of H2SO4? Keep 2 decimal places for your answer. 6. At constant pressure, density of gas is inversely proportional to its temperature. This is how hot air balloon is…arrow_forwardWhich of the following is a correct pairing of concepts? a. gram, metric unit of mass b. liter, metric unit of length c. meter, metric unit of volume d. no correct responsearrow_forward
- Dimensional analysis question #5: A graduated cylinder contains 20.5 mL of water. What is the new water level (mL) after 41.3 g of silver metal with a density of 10.5 g/cm3 is submerged in the water?arrow_forwardProcedure: Determine the correct weight of the empty graduated cylinder (measuring device). Fill up the cylinder(measuring device) with water, record the volume and weight of the cylinder with water. Do this for several trials, filling up the cylinder with water under different volumes. Using consistent units for weights and volumes corresponding to each trial, determine the trial densities as m/V in kg per cubic meter or gm per cubic centimeter. Do another exercise by using other liquid,(cooking oil) like oil, kerosene, etc. Tabulate the data and identify the liquid used. Computation: Let V = volume of liquid ( or ) = mass of empty cylinder (kg or gm) = mass of cylinder + liquid (kg or gm) m = mass of liquid (kg or gm) m = mT-me p=m/V Questions: Will there be variation in density of water if there is temperature variation? Why? _________________________ Observations: _______________________ Conclusions: _________________arrow_forwardA piece of foam has a mass of 24.3g and a volume of 7.21 x1^5 mm^3. What is the density of the foam in g/cm^3? Report answer in thousandths placearrow_forward
- General, Organic, and Biological ChemistryChemistryISBN:9781285853918Author:H. Stephen StokerPublisher:Cengage LearningChemistry: Matter and ChangeChemistryISBN:9780078746376Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl WistromPublisher:Glencoe/McGraw-Hill School Pub Co