Chemistry: An Introduction to General, Organic, and Biological Chemistry (12th Edition) - Standalone book
12th Edition
ISBN: 9780321908445
Author: Karen C. Timberlake
Publisher: PEARSON
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Textbook Question
Chapter 2.5, Problem 2.43QAP
Why can two conversion factors be written for an equality such as 1m = 100 cm?
2.44 How can you check that you have written the correct conversion factors for an equality?
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Why can two conversion factors be written for an equality such as 1 m = 100 cm?
Find the difference between the value of x2 and the sum of x1 plus x3.; let x4 be equivalent to the sum of x1 and x3 and let x5 be the difference between x2 and x5. This calculation scheme is shown below. Make notes about any similarities or differences between the values in your notes. x4 = x1 + x3 x5 = x2 – x4
Data Analyis
This section will include all data collected during the lab.
Thermochemical Data
Tinitial (°C)
Tfinal (°C)
ΔT (°C)
moles NaOH
qreaction (kJ)
ΔHrxn
Reaction 1
25.0
30.3
+5.3
0.025
-1.11
-44.4
Reaction 2
25.0
37.0
+12.0
0.025
-2.51
-100.4
Reaction 3
25.0
31.7
+6.7
0.025
-1.40
-56.1
Reaction 1: NaOH(s) → Na+(aq) + OH-(aq) + x1 kJ
1g /39.977g/mol = 0.025 moles
Moles NaOH = 0.025
qsolution = (4.184 J/g °C) (50.0g) (30.3°C -25.0°C)
= -1108.76 J/ 1000
qreaction (kJ) = -1.11 kJ
ΔH = -1.11 kJ/ 0.025 moles
ΔHrxn = -44.4 kJ/mol…
If I have these values and need to calculate percentage, what are the significant figures I need?
1.23, 4.56
so 1.23/4.56 x 100 is 3 significant figures or 1? I just attached a similar question and used arbitrary values just to understand the significant figures pRt
Chapter 2 Solutions
Chemistry: An Introduction to General, Organic, and Biological Chemistry (12th Edition) - Standalone book
Ch. 2.1 - Prob. 2.1QAPCh. 2.1 - Prob. 2.2QAPCh. 2.1 - Prob. 2.3QAPCh. 2.1 - Prob. 2.4QAPCh. 2.1 - Write the abbreviation for each of the following:...Ch. 2.1 - Write the abbreviation for each of the following:...Ch. 2.2 - Prob. 2.7QAPCh. 2.2 - Prob. 2.8QAPCh. 2.2 - Prob. 2.9QAPCh. 2.2 - Prob. 2.10QAP
Ch. 2.2 - 2.13 Indicate if the zeros are significant in each...Ch. 2.2 - 2.14 Indicate if the zeros are significant in each...Ch. 2.2 - 2.9 How many significant figures are in each of...Ch. 2.2 - How many significant figures are in each of the...Ch. 2.2 - 2.11 In which of the following pairs do both...Ch. 2.2 - 2.12 In which of the following pairs do both...Ch. 2.2 - 2.15 Write each of the following in scientific...Ch. 2.2 - 2.16 Write each of the following in scientific...Ch. 2.3 - Prob. 2.19QAPCh. 2.3 - Prob. 2.20QAPCh. 2.3 - Round off each of the following calculator answers...Ch. 2.3 - Prob. 2.22QAPCh. 2.3 - Prob. 2.23QAPCh. 2.3 - Prob. 2.24QAPCh. 2.3 - Prob. 2.25QAPCh. 2.3 - Prob. 2.26QAPCh. 2.3 - Prob. 2.27QAPCh. 2.3 - Prob. 2.28QAPCh. 2.4 - Prob. 2.29QAPCh. 2.4 - Prob. 2.30QAPCh. 2.4 - 2.31 Write the abbreviation for each of the...Ch. 2.4 - Write the abbreviation for each of the following...Ch. 2.4 - Prob. 2.33QAPCh. 2.4 - Prob. 2.34QAPCh. 2.4 - Write the numerical value for each of the...Ch. 2.4 - Prob. 2.36QAPCh. 2.4 - Prob. 2.37QAPCh. 2.4 - Use a prefix to write the name for each of the...Ch. 2.4 - Complete each of the following metric...Ch. 2.4 - Prob. 2.40QAPCh. 2.4 - Prob. 2.41QAPCh. 2.4 - Prob. 2.42QAPCh. 2.5 - Why can two conversion factors be written for an...Ch. 2.5 - Prob. 2.44QAPCh. 2.5 - Prob. 2.45QAPCh. 2.5 - Prob. 2.46QAPCh. 2.5 - Write the equality and two conversion factors, and...Ch. 2.5 - Write the equality and two conversion factors, and...Ch. 2.6 - Prob. 2.49QAPCh. 2.6 - Prob. 2.50QAPCh. 2.6 - Prob. 2.51QAPCh. 2.6 - Prob. 2.52QAPCh. 2.6 - Prob. 2.53QAPCh. 2.6 - Prob. 2.54QAPCh. 2.6 - Prob. 2.55QAPCh. 2.6 - Prob. 2.56QAPCh. 2.7 - Prob. 2.57QAPCh. 2.7 - Prob. 2.58QAPCh. 2.7 - Prob. 2.59QAPCh. 2.7 - Prob. 2.60QAPCh. 2.7 - Prob. 2.61QAPCh. 2.7 - Prob. 2.62QAPCh. 2 - In which of the fo1losing pairs do both numbers...Ch. 2 - In which of the following pairs do both numbers...Ch. 2 - Indicate if each of the following is answered with...Ch. 2 - Prob. 2.66UTCCh. 2 - Prob. 2.67UTCCh. 2 - Prob. 2.68UTCCh. 2 - Prob. 2.69UTCCh. 2 - Prob. 2.70UTCCh. 2 - Prob. 2.71AQAPCh. 2 - Prob. 2.72AQAPCh. 2 - Prob. 2.73AQAPCh. 2 - Prob. 2.74AQAPCh. 2 - Prob. 2.75AQAPCh. 2 - Prob. 2.76AQAPCh. 2 - Prob. 2.77AQAPCh. 2 - Prob. 2.78AQAPCh. 2 - Prob. 2.79AQAPCh. 2 - Prob. 2.80AQAPCh. 2 - Prob. 2.81AQAPCh. 2 - Prob. 2.82AQAPCh. 2 - Prob. 2.83AQAPCh. 2 - Prob. 2.84AQAPCh. 2 - Prob. 2.85AQAPCh. 2 - Prob. 2.86AQAPCh. 2 - Prob. 2.87AQAPCh. 2 - Prob. 2.88AQAPCh. 2 - Prob. 2.89CQCh. 2 - Prob. 2.90CQCh. 2 -
2.117 A car travels at 55 mi/h and gets 11 km/L...Ch. 2 - Prob. 2.92CQCh. 2 - Prob. 2.93CQCh. 2 - A sunscreen preparation contains 2.50% benzyl...Ch. 2 - Prob. 2.95CQCh. 2 - Prob. 2.96CQCh. 2 - Prob. 2.97CQCh. 2 - Prob. 2.98CQCh. 2 - Prob. 2.99CQCh. 2 - Prob. 2.100CQ
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.Similar questions
- For these questions, be sure to apply the rules for significant figures. a You are conducting an experiment where you need the volume of a box; you take the length, height, and width measurements and then multiply the values together to find the volume. You report the volume of the box as 0.310 m1. If two of your measurements were 0.7120 m and 0.52145 m, what was the other measurement? b If you were to add the two measurements from the first part of the problem to a third length measurement with the reported result of 1.509 m, what was the value of the third measurement?arrow_forwardFor the pin shown below, why is the third digit determined for the length of the pin uncertain? Considering that the third digit is uncertain, explain why the length of the pin is indicated as 2.85 cm rather than, for example, 2.83 or 2.87 cm.arrow_forwardO MEASUREMENT Setting up a one-step unit conversion A student sets up the following equation to convert a meașurement. (The ? stands for a number the student is going to calculate.) Fill in the missing part of this equation. I = ? 2 0.040 x10 %3D mc? marrow_forward
- 5. The Handbook of Chemistry and Physics lists the density of a certain liguid to be 07988 g/mL. Fred experimentally finds this liquid to have a density of 0.7914 a/ml The teacher allows up to +/- 0.500% error to make an "A" on the lab. Did Fred make an "A"? Prove your answer,arrow_forwardI'm confused with this question: 7.379 * 10-4m3 * (100cm/1m)3 * 19.3g/cm3 I know that I need 3 significant figures. When I tried to type in the answer I got, 1.42, it said that I forgot to cube the conversion factor. I don't know what that means.arrow_forwardConversion Factors: A rattlesnake is 2.44-m long. How long is the snake in cm? Note: We just learned this in one day, and I don't understand how my professor got some of her answers (1 * 6^-2 m) She didn't really give us any steps to answer the questions.arrow_forward
- 1. Why are units so important in measurement? Giving examples of measurements with no units should help. 2. What does it mean to say that 2 expressions are equivalent?arrow_forwardThe density of a metal is 8.67 g/cm3. How many pounds are in 298.86 in3 of the metal? (You can use the conversion factor approach. Or, you can convert density in g/cm3 to Ib/in3 and then multiply the result times number of pounds. 2.52 cm = 1 inch 454 g 1 lbarrow_forward190g = 0.42lb How does your experimental factor compare to the standard conversion factor of 454 g/lbarrow_forward
- 1. Approximately, what is the percent uncertainty in the measurement 3.70 + 0.25m? 2. Convert 1.57m 2 to inch 2 3. The diameter of atom is about 1 x 10 -10m . State this in inches (Scientific Notation)arrow_forwardQuestion 1 Give the correct number of significant figures for 2500, 2500. ,0.0043, 0.06050 Question 2 Give the answer to the correct number of significant figures: 7964 + 86.94 + 760 =? Question 3 Give the answer to the correct number of significant figures: 4.596 - 2.81 =? Question 4 Give the answer to the correct number of significant figures: (4.58 x 10) x (4.3198 x 10-19) =? Question 5 Give the answer in scientific notation and to the correct number of significant figures: (7860) / (0.00001)=?arrow_forward||| ✪ MEASUREMEN Setting up a one-step unit conversion A student sets up the following equation to convert a measurement. (The ? stands for a number the student is going to calculate.) Fill in the missing part of this equation. 13.- (1) 3 0 3arrow_forward
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