Chemistry for Changing Times
14th Edition
ISBN: 9780134212777
Author: John W. Hill; Terry W. McCreary
Publisher: Pearson Education (US)
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Textbook Question
Chapter 1, Problem 75AP
For Problems 74 and 75, classify each of the numbered statements as (a) an experiment, (b) a hypothesis. (c) a scientific law, (d) an observation, or (e) a theory. (It is not necessary to understand the science involved to do these problems.)
75. Potassium bromate acts as a conditioner in dough made from wheat flour. Flour contains a protein called gluten. Proteins consist of amino-acid units linked in long chains. (1) Dough to which potassium bromate has been added rises better, producing a lighter, larger volume loaf. (2) Potassium bromate acts by oxidizing the gluten and cross-linking tyrosine (an amino acid) units of the protein molecules. enabling the dough to retain gas better. (3) A scientist wonders if sodium bromate might cross-link separate tyrosine molecules, forming a dimer (a molecule consisting of two subunits). (4) She adds sodium bromate to a solution of tyrosine. (5) She notes that a precipitate (solid falling out of solution) is formed.
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1. This experiment is more about understanding the colligative properties of a solution rather than the determination of
the molar mass of a solid.
a. Define colligative properties.
b. Which of the following solutes has the greatest effect on the colligative properties for a given mass of pure water?
Explain.
(i) 0.01 mol of CaCl2
(ii) 0.01 mol of KNO3
(iii) 0.01 mol of CO(NH2)2
(an electrolyte)
(an electrolyte)
(a nonelectrolyte)
5. b. For Trials 2 and 3, the molar mass of the solute was 151 g/mol and 143 g/mol respectively.
a. What is the average molar mass of the solute ?
b. What are the standard deviation and the relative standard deviation (%RSD) for the molar mass of the solute ?
Show work. Don't give Ai generated solution
Chapter 1 Solutions
Chemistry for Changing Times
Ch. 1 - Prob. 1RQCh. 1 - Why do experiments have to be done to support a...Ch. 1 - Why can't scientific methods always be used to...Ch. 1 - How does technology differ from science?Ch. 1 - Prob. 5RQCh. 1 - Prob. 6RQCh. 1 - What is a DQ? What does a large DQ mean? Why is it...Ch. 1 - What derived units of (a) mass and (b) length are...Ch. 1 - What is the Sl-derived unit for volume? What...Ch. 1 - Prefix Symbol Definition tera- T 1012 - M - centi-...
Ch. 1 - Prob. 11RQCh. 1 - Identify the following work as either applied...Ch. 1 - Penicillin kills bacteria, thus saving the lives...Ch. 1 - Prob. 14PCh. 1 - Prob. 15PCh. 1 - X-rays are widely used in medicine and dentistry....Ch. 1 - Prob. 17PCh. 1 - The virus called HIV causes AIDS, a devastating...Ch. 1 - Which are realistic masses for a cellular...Ch. 1 - In Europe, A2 sized paper measures 594 mm 420 mm,...Ch. 1 - Which one(s) of the following are likely to be...Ch. 1 - Sample X on the moon has exactly the same mass as...Ch. 1 - Which of the following is a reasonable volume for...Ch. 1 - Which of the following is a reasonable...Ch. 1 - Earth's oceans contain 3.501 0 8 mi3 of water and...Ch. 1 - What is the area of Earth's oceans in square...Ch. 1 - Consider the two tubes shown below. The aluminum...Ch. 1 - Which one(s) of the following could be the inside...Ch. 1 - Identify the following as physical or chemical...Ch. 1 - Identify the following as physical or chemical...Ch. 1 - Identify the following changes as physical or...Ch. 1 - Identify the following changes as physical or...Ch. 1 - Identify each of the following as a substance or a...Ch. 1 - Identify each of the following as a substance or a...Ch. 1 - Which of the following mixtures are homogeneous,...Ch. 1 - Which of the following mixtures are homogeneous,...Ch. 1 - Every sample of the sugar glucose (no matter where...Ch. 1 - An advertisement for shampoo says, "Pure shampoo,...Ch. 1 - Which of the following represent elements, and...Ch. 1 - Prob. 40PCh. 1 - Prob. 41PCh. 1 - Without consulting tables, write a symbol for each...Ch. 1 - In his 1739 textbook, Traite elementaire de...Ch. 1 - In 1774 Joseph Priestley isolated a gas that he...Ch. 1 - Change the unit for each of the following...Ch. 1 - Convert each of the following measurements to the...Ch. 1 - Carry out the following conversions. a. 5.52104 mL...Ch. 1 - Carry out the following conversions. a. 546 mm to...Ch. 1 - Indicate which is the larger unit in each pair. a....Ch. 1 - There are about...Ch. 1 - Express the length of a 31 -cm ruler in (a) mm,...Ch. 1 - What is the volume in liters of (a) a 352-mL soft...Ch. 1 - (You may need data from Table 1.6 for some of...Ch. 1 - (You may need data from Table 1.6 for some of...Ch. 1 - (You may need data from Table 1.6 for some of...Ch. 1 - (You may need data from Table 1.6 for some of...Ch. 1 - (You may need data from Table 1.6 for some of...Ch. 1 - (You may need data from Table 1.6 for some of...Ch. 1 - (You may need data from Table 1.6 for some of...Ch. 1 - (You may need data from Table 1.6 for some of...Ch. 1 - Prob. 61PCh. 1 - (You may need data from Table 1.6 for some of...Ch. 1 - (You may need data from Table 1.6 for some of...Ch. 1 - (You may need data from Table 1.6 for some of...Ch. 1 - Liquid nitrogen, used for freezing sperm samples,...Ch. 1 - Normal body temperature is about 37 °C. What is...Ch. 1 - Prob. 67PCh. 1 - Prob. 68PCh. 1 - A certain chemistry class is 1.00 microcentury ( ...Ch. 1 - 70. A unit of beauty, a helen, thought to have...Ch. 1 - 71. English chemist William Henry studied the...Ch. 1 - Prob. 72APCh. 1 - Prob. 73APCh. 1 - For Problems 74 and 75t, classify each of the...Ch. 1 - For Problems 74 and 75, classify each of the...Ch. 1 - Prob. 76APCh. 1 - Prob. 77APCh. 1 - Prob. 78APCh. 1 - Prob. 79APCh. 1 - Prob. 80APCh. 1 - Prob. 81APCh. 1 - Prob. 82APCh. 1 - Prob. 83APCh. 1 - Prob. 84APCh. 1 - Prob. 85APCh. 1 - Prob. 86APCh. 1 - The density of a planet can be approximated from...Ch. 1 - The extrasolar planet HAT-P-i orbits a star 450...Ch. 1 - Prob. 89APCh. 1 - Prob. 90APCh. 1 - Prob. 91APCh. 1 - Prob. 92APCh. 1 - Prob. 1.1CTECh. 1 - Prob. 1.2CTECh. 1 - Prob. 1.3CTECh. 1 - Prob. 1.4CTECh. 1 - Prob. 1.5CTECh. 1 - Prob. 1.6CTECh. 1 - Prob. 1CGPCh. 1 - Prob. 2CGPCh. 1 - Prob. 3CGPCh. 1 - Materials Needed: • 1/4 cup dark corn syrup • 1/4...Ch. 1 - Materials Needed: • 1/4 cup dark corn syrup • 1/4...Ch. 1 - Prob. 3CHQCh. 1 - Prob. 4CHQCh. 1 - Materials Needed: • 1/4 cup dark corn syrup • 1/4...
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