Homework Help is Here – Start Your Trial Now!
Science
Chemistry
Questions 64 and 65 Dental cements, which are used to fill cavities in teeth, are made by mixing a metal oxide powder with an acidic liquid. The metal oxide contains divalent ions, such as Ca2+, Mg2+ and Zn2+, or trivalent ions, such as AP+. The acidic liquid contains divalent anions, A2, or trivalent anions, A³- For example, metal ions, M2+, and divalent anions, A2-, form a dental cement of the form MA, as shown. MO powder + H₂A MA acidic dental liquid cement H₂O The figure shows the percentage by mass of evaporable and non-evaporable water in four dental cements at various times after mixing, and the compressive strength of the cements at these times. The hydration of a dental cement is the ratio of non-evaporable water to evaporable water. 64 ww% 20 zinc phosphate 15 10 zinc polycarboxylate Cevaporable non-evaporable silicate glass ionomer BAYYYY. Time (h) Compressive strength (MPa) 0 05 " 340 340 40 4 340 93 141 150 117 201 252 I Which one of the following represents the formula for a dental cement formed by reacting a trivalent metal ion with a divalent anion? 65 A M₂As B MA C M.A D ΜΑΣ Which one of the following is true based on the information given? The weakest cement is the most hydrated Zine cements are more hydrated than glass ionomers. B The hydration of cements increases with age. D As hydration increases, the compressive strength of the cement decreases

Questions 64 and 65 Dental cements, which are used to fill cavities in teeth, are made by mixing a metal oxide powder with an acidic liquid. The metal oxide contains divalent ions, such as Ca2+, Mg2+ and Zn2+, or trivalent ions, such as AP+. The acidic liquid contains divalent anions, A2, or trivalent anions, A³- For example, metal ions, M2+, and divalent anions, A2-, form a dental cement of the form MA, as shown. MO powder + H₂A MA acidic dental liquid cement H₂O The figure shows the percentage by mass of evaporable and non-evaporable water in four dental cements at various times after mixing, and the compressive strength of the cements at these times. The hydration of a dental cement is the ratio of non-evaporable water to evaporable water. 64 ww% 20 zinc phosphate 15 10 zinc polycarboxylate Cevaporable non-evaporable silicate glass ionomer BAYYYY. Time (h) Compressive strength (MPa) 0 05 " 340 340 40 4 340 93 141 150 117 201 252 I Which one of the following represents the formula for a dental cement formed by reacting a trivalent metal ion with a divalent anion? 65 A M₂As B MA C M.A D ΜΑΣ Which one of the following is true based on the information given? The weakest cement is the most hydrated Zine cements are more hydrated than glass ionomers. B The hydration of cements increases with age. D As hydration increases, the compressive strength of the cement decreases

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
See similar textbooks
icon
Related questions
Question
Questions 64 and 65 Dental cements, which are used to fill cavities in teeth, are made by mixing a metal oxide powder with an acidic liquid. The metal oxide contains divalent ions, such as Ca2+, Mg2+ and Zn2+, or trivalent ions, such as AB+. The acidic liquid contains divalent anions, A2, or trivalent anions, A3- For example, metal ions, M2+, and divalent anions, A2-, form a dental cement of the form MA, as shown. MO + H₂A MA + H₂O powder acidic dental liquid cement The figure shows the percentage by mass of evaporable and non-evaporable water in four dental cements at various times after mixing, and the compressive strength of the cements at these times. The hydration of a dental cement is the ratio of non-evaporable water to evaporable water. 64 ww% 20 20 15 10 zinc phosphate zinc polycarboxylate 8 0 evaporable non-evaporable silicate glass ionomer vvvvvvvvvv Time (h) Compressive xtrength (MPa) 0 0.5 40 340 93 141 150 40 62 75 117 201 252 T Which one of the following represents the formula for a dental cement formed by reacting a trivalent metal ion with a divalent anion? 65 ^ MA B Map C MA D ΜΑ Which one of the following is true based on the information given? The weakest cement is the most hydrated B The hydration of cements increases with age. Zine cements are more hydrated than glass ionomers. As hydration increases, the compressive strength of the cement decreases
Transcribed Image Text:Questions 64 and 65 Dental cements, which are used to fill cavities in teeth, are made by mixing a metal oxide powder with an acidic liquid. The metal oxide contains divalent ions, such as Ca2+, Mg2+ and Zn2+, or trivalent ions, such as AB+. The acidic liquid contains divalent anions, A2, or trivalent anions, A3- For example, metal ions, M2+, and divalent anions, A2-, form a dental cement of the form MA, as shown. MO + H₂A MA + H₂O powder acidic dental liquid cement The figure shows the percentage by mass of evaporable and non-evaporable water in four dental cements at various times after mixing, and the compressive strength of the cements at these times. The hydration of a dental cement is the ratio of non-evaporable water to evaporable water. 64 ww% 20 20 15 10 zinc phosphate zinc polycarboxylate 8 0 evaporable non-evaporable silicate glass ionomer vvvvvvvvvv Time (h) Compressive xtrength (MPa) 0 0.5 40 340 93 141 150 40 62 75 117 201 252 T Which one of the following represents the formula for a dental cement formed by reacting a trivalent metal ion with a divalent anion? 65 ^ MA B Map C MA D ΜΑ Which one of the following is true based on the information given? The weakest cement is the most hydrated B The hydration of cements increases with age. Zine cements are more hydrated than glass ionomers. As hydration increases, the compressive strength of the cement decreases
Expert Solution
steps

Step by step

Solved in 4 steps with 2 images

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Knowledge Booster
Solutions
Learn more about
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
  • SEE MORE QUESTIONS
Recommended textbooks for you
Chemistry
Chemistry
Chemistry
ISBN:
9781305957404
Author:
Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning
Chemistry
Chemistry
Chemistry
ISBN:
9781259911156
Author:
Raymond Chang Dr., Jason Overby Professor
Publisher:
McGraw-Hill Education
Principles of Instrumental Analysis
Principles of Instrumental Analysis
Chemistry
ISBN:
9781305577213
Author:
Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:
Cengage Learning
Organic Chemistry
Organic Chemistry
Chemistry
ISBN:
9780078021558
Author:
Janice Gorzynski Smith Dr.
Publisher:
McGraw-Hill Education
Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
Chemistry
ISBN:
9781305079373
Author:
William L. Masterton, Cecile N. Hurley
Publisher:
Cengage Learning
Elementary Principles of Chemical Processes, Bind…
Elementary Principles of Chemical Processes, Bind…
Chemistry
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY
SEE MORE TEXTBOOKS