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select the statement that best describes a chemical buffer.
Select the statement that best describes a...
• Buffer conceptual and calculation: • A chemist needs a pH 3.33 buffer. Select the best...
• Buffer conceptual and calculation: • A chemist needs a pH 3.33 buffer. Select the best choice from these four acids to start making a buffer nearest the desired pH. • Hydrofluoric acid, HF K = 6.8x10-4 • Formic acid, HCHO, Kg = 1.7x10-4 • Acetic acid, HCH,CO, K= 1.7x10-5 • Propionic acid, HC2H50, Ks = 1.3x10-5 Assume the best acid is combined with its appropriate conjugate base. What is the [base]/[acid) ratio needed to make the pH 3.33 buffer?...
please answer 17,22, 23 QUESTION 17 Which of the following best describes the role of the...
please answer 17,22, 23
QUESTION 17 Which of the following best describes the role of the syncytiotrophoblast? produces progesterone to maintain the pregnancy gives rise to the chorionic villi O provides the structural basis for the umbilical cord gives rise to the embryonic disk digests uterine cells during the process of implantation QUESTION 22 Which of the following occurs if a strong acid is added to the bicarbonate buffer system? the bicarbonate ions of the salt tie up excess hydrogen...
consider the following transformations. which of the statement best describes the process Before After A) A...
consider the following transformations. which of the
statement best describes the process
Before After A) A chemical change occurs in which atoms rearrange to form a new compound. B) A chemical change occurs in which an ionic compound is formed from diatomic elemen C) A chemical change occurs in which no atoms rearrange to form a new substance. D) A physical change occurs in which no atoms rearrange to form a new substance. E) A physical change occurs in which...
Select all of the statements that are true about a buffer solution. A buffer solution always...
Select all of the statements that are true about a buffer solution. A buffer solution always changes color when the pH changes. A buffer solution reacts with acidic solutions. A buffer solution has a pH of 7. A buffer solution reacts with basic solutions. A buffer solution resists small changes in pH. At what point on the titration curve for a weak acid is the solution a buffer? This is called the buffer region. 14 12- E D OA 10-...
Which of the following describes the pI of an amino acid? Select one: Oa. the pH...
Which of the following describes the pI of an amino acid? Select one: Oa. the pH at which the amino acid is primarily in the zwitterion form b. the pH at which there are equal concentrations of protonated and neutral forms c, the negative log of the concentration of the ionized amino acid d. the pH of the buffer solution used in electrophoresis that causes the amino acid to migrate to the positive electrode 0 O
Which statement best describes why graphite is soft: Select one: O a. None of the above...
Which statement best describes why graphite is soft: Select one: O a. None of the above O b. Graphite is layered c. Graphite is made up of only carbon atoms O d. Graphite has low melting point ge
Question 3 1 pts Which statement accurately describes what happens in a buffer solution when you...
Question 3 1 pts Which statement accurately describes what happens in a buffer solution when you add strong acid or strong base? The strong species is converted to weak species by reaction The pH change is smaller than you expect based on the amount of acid or base added Two reactions occurs-first a completion reaction, then an equilibrium reaction All three statements above accurately describe this situation Question 4 Can you create a buffer by mixing HNO3 with KOH? Yes-...
1) Which of the following best indicates the meaning of the term autoionization? Select the correct...
1) Which of the following best indicates the meaning of the term autoionization? Select the correct answer below: a)Autoionization is a reaction involving the transfer of a proton from an acid to water, yielding hydronium ions and the conjugate base of the acid. b)Autoionization is a reaction involving the transfer of a proton from water to a base, yielding hydroxide ions and the conjugate acid of the base. c)Autoionization is a reaction between two molecules of the same neutral substance...
6. compoca of 2 or more diffipu LIUTUVIU Select the statement(s) that best describe(s) the two...
6. compoca of 2 or more diffipu LIUTUVIU Select the statement(s) that best describe(s) the two boxes shown. You may select as many choices as you wish. or To Each box contains a compound. Each box contains a mixture. Box A contains a mixture and box B contains a pure substance. Each box contains a pure substance. Box A contains a mixture of elements, box B contains a pure element.
Matching the indicator described with the best buffer system to use when making solutions to determine...
Matching the indicator described with the best buffer system to use when making solutions to
determine the pKa by measuring absorbance. Some useful
information:
Matching the indicator described with the best buffer system to use when making solutions to determine the pk, by measuring absorbance. Some useful information: Buffer component pka Acetic (ethanoic) acid 4.76 Phosphoric acid 2.17 7.21 Sodium dihydrogen phosphate 12.32 Sodium hydrogen phosphate Benzopurpurin 4B, changes from violet to red in the pH range 1.2 to 3.8...
• Buffer conceptual and calculation: • A chemist needs a pH 3.33 buffer. Select the best choice from these four acids to start making a buffer nearest the desired pH. • Hydrofluoric acid, HF K = 6.8x10-4 • Formic acid, HCHO, Kg = 1.7x10-4 • Acetic acid, HCH,CO, K= 1.7x10-5 • Propionic acid, HC2H50, Ks = 1.3x10-5 Assume the best acid is combined with its appropriate conjugate base. What is the [base]/[acid) ratio needed to make the pH 3.33 buffer?...
please answer 17,22, 23
QUESTION 17 Which of the following best describes the role of the syncytiotrophoblast? produces progesterone to maintain the pregnancy gives rise to the chorionic villi O provides the structural basis for the umbilical cord gives rise to the embryonic disk digests uterine cells during the process of implantation QUESTION 22 Which of the following occurs if a strong acid is added to the bicarbonate buffer system? the bicarbonate ions of the salt tie up excess hydrogen...
consider the following transformations. which of the
statement best describes the process
Before After A) A chemical change occurs in which atoms rearrange to form a new compound. B) A chemical change occurs in which an ionic compound is formed from diatomic elemen C) A chemical change occurs in which no atoms rearrange to form a new substance. D) A physical change occurs in which no atoms rearrange to form a new substance. E) A physical change occurs in which...
Select all of the statements that are true about a buffer solution. A buffer solution always changes color when the pH changes. A buffer solution reacts with acidic solutions. A buffer solution has a pH of 7. A buffer solution reacts with basic solutions. A buffer solution resists small changes in pH. At what point on the titration curve for a weak acid is the solution a buffer? This is called the buffer region. 14 12- E D OA 10-...
Which of the following describes the pI of an amino acid? Select one: Oa. the pH at which the amino acid is primarily in the zwitterion form b. the pH at which there are equal concentrations of protonated and neutral forms c, the negative log of the concentration of the ionized amino acid d. the pH of the buffer solution used in electrophoresis that causes the amino acid to migrate to the positive electrode 0 O
Which statement best describes why graphite is soft: Select one: O a. None of the above O b. Graphite is layered c. Graphite is made up of only carbon atoms O d. Graphite has low melting point ge
Question 3 1 pts Which statement accurately describes what happens in a buffer solution when you add strong acid or strong base? The strong species is converted to weak species by reaction The pH change is smaller than you expect based on the amount of acid or base added Two reactions occurs-first a completion reaction, then an equilibrium reaction All three statements above accurately describe this situation Question 4 Can you create a buffer by mixing HNO3 with KOH? Yes-...
6. compoca of 2 or more diffipu LIUTUVIU Select the statement(s) that best describe(s) the two boxes shown. You may select as many choices as you wish. or To Each box contains a compound. Each box contains a mixture. Box A contains a mixture and box B contains a pure substance. Each box contains a pure substance. Box A contains a mixture of elements, box B contains a pure element.
Matching the indicator described with the best buffer system to use when making solutions to
determine the pKa by measuring absorbance. Some useful
information:
Matching the indicator described with the best buffer system to use when making solutions to determine the pk, by measuring absorbance. Some useful information: Buffer component pka Acetic (ethanoic) acid 4.76 Phosphoric acid 2.17 7.21 Sodium dihydrogen phosphate 12.32 Sodium hydrogen phosphate Benzopurpurin 4B, changes from violet to red in the pH range 1.2 to 3.8...
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