What is the ionic charge for this element : Ca?
IONIC CHARGE
What is the ionic charge for this element : Ca?
What is the mass flow rate of this stream in kg/min? What is the molar flow rate in mol/s?
/in Chemistry /by SamAssignment
3 Liquid acetaldehyde (C₂H₄O) is flowing through a pipe at a rate of 235 m³ /h.
- (a)What is the mass flow rate of this stream in kg/min? ,
- (b)What is the molar flow rate in mol/s?
The anti-phase boundary (APB) strengthening is the main strengthening mechanism for Ni superalloys. What is the APB. How does the APB strengthening happen? (15 points)
/in Chemistry /by SamStrengthening
The anti-phase boundary (APB) strengthening is the main strengthening mechanism for Ni superalloys. What is the APB. How does the APB strengthening happen? (15 points)
Ni superalloys are the choice for mechanical structures in space applications at 650~1,100°C because they provide both high strength and good oxidation/corrosion resistance. For the majority of engineering materials, such as Fe, Cu, Al and Ti alloys, their yield strength decreases rapidly with increasing temperature, as shown in Figure 1
- (a). Nevertheless, the yield strength of Ni superalloys increases with increasing temperature until close to the alloys’ melting point, as shown in Figure 1
- (b). Explain why they behave so uniquely? (25 pts)
What are crystalline materials? What are non-crystalline materials? What is allotropic? What is polymorphic? What are unit cell, lattice constant and the number of atoms per unit cell? What is the number of atoms of BCC, FCC and HCP?
/in Chemistry /by SamMaterials Science
HW of ETM 307 Chapter 4 of ETM307: Crystal Structure 80 points in total
- What are crystalline materials? What are non-crystalline materials? (5 points)
- What is allotropic? What is polymorphic? (5 points)
- What are unit cell, lattice constant and the number of atoms per unit cell? What is the number of atoms of BCC, FCC and HCP? (10 points)
- What is the atomic packing factor? What are the atomic packing factors of BCC, FCC and HCP? Does the volume increase or decrease when FCC iron changes to BCC iron? Why? (10 points)
- What are the families of crystal directions and planes? (10 points)
- What are the closest packed crystalline direction and plane of BCC and FCC? (10 points)
- What are the similarity and difference between FCC and HCP crystal structures? (10 points)
- What are the Miller indexes of two crystal directions and one crystal plane in the following figure? (10 points)
- Please identify the Miller-Bravais’ indexes of the crystal direction and plane indicated in the following hexagonal
What is an azeotrope? What is the boiling point and composition of the azeotrope used in this lab? Is this ethanol-water azeotrope a pure liquid?
/in Chemistry /by SamEthanol Distillation Post-Analysis
Answer the following questions about the Ethanol Distillation lab. This assignment is due on Thursday, December 8th.
- What is an azeotrope? What is the boiling point and composition of the azeotrope used in this lab?
- Is this ethanol-water azeotrope a pure liquid? (think about its constant boiling point)
- Which fractions of the fractional distillation contain the greatest percentage of ethanol? What is the major component of later, higher boiling fractions?
- What specific type of azeotrope is the ethanol-water mixture used in this lab? Explain who this mixture represents a minimum-boiling azeotrope.
- Compare and contrast the observed differences between simple distillation and the fractional distillation for separating the ethanol-water mixture used in this lab.
What is your stand regarding the use of antibiotics and the risk of bacteria outbreaks? Do you think the government should ban the use of antibiotics in animals used for consumption? Explain your answer.
/in Chemistry /by SamAntibiotics resistance and health
Part I
- What is your stand regarding the use of antibiotics and the risk of bacteria outbreaks?
- Do you think the government should ban the use of antibiotics in animals used for consumption? Explain your answer.
- After watching the second video, explain in your own words the comparison the author makes regarding emission taxes and antibiotics.
- Use the following topic antibiotics resistance and health to search in YouTube and share with us a video related to this topic and explain what caught your attention from this video.
Part II
Choose one antibiotic class from the table below and use the name of the examples to find the chemical structure in MoView https://molview.org/.
Make a screenshot of the structures and edit the image by naming all functional groups and identify the chemical similarities and differences between the antibiotics of the class you chose.
See the example below. Class: Penicillin Examples: amoxicillin and ampicillin
The example is missing identification of functional groups.
Determining the Mechanism of a Nucleophilic Substitution Reaction Experimentally In this lab, your challenge is to design an experiment to answer the following question: Do primary alkyl halides such as 1-chlorobutane really react mostly via an SN2 pathway?
/in Chemistry /by SamMechanism of a Nucleophilic Substitution Reaction
We have covered nucleophilic substitution reactions in class. These are extremely important reactions both for synthesis in lab and in biological systems. This lab gives you a chance to carry out a nucleophilic substitution reaction, and a chance to experience how scientists determine the mechanism which governs a reaction.
When organic chemistry students attend class, they learn about many theoretical mechanisms via which chemical reaction are thought to occur. Why do chemists believe that these mechanisms are accurate models for chemical reactions?
Before beginning this lab, you should perform the following:
Review nucleophilic substitution reactions and mechanisms in Ch. 7 of Smith 6th Ed.
- Determining the Mechanism of a Nucleophilic Substitution Reaction Experimentally
- In this lab, your challenge is to design an experiment to answer the following question: Do primary alkyl halides such as 1-chlorobutane really react mostly via an SN2 pathway?
- Write a hypothesis answering the question above. Your hypothesis should include a brief reason for the answer you are espousing. What experiments can offer evidence for the mechanism of a reaction?
Which controls and/or standards were used in this study? Evaluate the statistical aspects of this study. How many experiments? How many patients/samples? Which of the methods compared was the most precise with respect to detection of the analyte?
/in Chemistry /by SamCritical analysis paper
Write/type up a critical analysis of the findings of this paper.
Your analysis should address the following questions:
- What was the purpose/objective of this study?
- What was the analyte?
- Which methods were used?
Briefly explain the basic steps of the analytical procedure(s) for each of the methods.
- Which controls and/or standards were used in this study?
- Evaluate the statistical aspects of this study. How many experiments? How many patients/samples?
- Which of the methods compared was the most precise with respect to detection of the analyte?
- Name potential weak spots of the study. What could be improved?
First watched the Sodium Carbonate and Hydrochloric Acid Reaction video. What type of reaction is Step 2?
/in Chemistry /by SamLab 5 Chemical Reactions
E X Fall 2022 Introduction …
Be sure to have first watched the Sodium Carbonate and Hydrochloric Acid Reaction video. What type of reaction is Step 2? (select one)
Q a. combination reaction
Q b. decomposition reaction
Q C. single replacement reaction
Q d. double replacement reaction
Q e. combustion reaction.
From the reaction shown below, what is expected to be seen in the flask as the reaction progresses towards the product side of the reaction?
/in Chemistry /by SamLab 5 Chemical Reactions
E X Fall 2022 Introduction .
Post-Lab Question
From the reaction shown below, what is expected to be seen in the flask as the reaction progresses towards the product side of the reaction? (select one)
CuCl2 (aq) + Br2 (aq) CuBr2 (aq) + Cl2 (g)
clear-colorless clear-colorless clear-gray greenish-yellow
Q a. a clear-blue solution • b. a solution containing a white solid O c. a clear-brown solution O d. a solution with greenish-yellow bubbles
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