Q9. For each of the following chemical and physical changes carried out at constant pressure, state whether work is done by the system on the surroundings or by the surroundings on the system, or whether the amount of work is negligible. State whether process or reaction is endothermic or exothermic.
A.benzene (l) → benzene (g)
B. ½ N2(g) + 3/2 H2(g) → NH3(g) ΔH = -92 kJ/mol
C. 2NH4NO3(s) → 2N2(g) + 4H2O(g) + O2(g) + heat
D. H2(g) + Cl2(g) → 2HCl(g) + heat
E. CaCO3(s) + 178 kJ/mol → CaO + CO2 (g)
In: Chemistry
University officials hope that changes they have made have improved the retention rate. In 2018, a sample of 1926 freshman showed that 1400 returned as sophomores. In 2019, a sample of 2011 freshman showed that 1508 returned as sophomores. Determine if there is sufficient evidence at the 0.05 level to say that the retention rate has improved.
In: Statistics and Probability
how are we socially politically and economically affected by environmental changes such as greenhouse gases. what are the potential outcomes that the social political and economical parties will face due to greenhouse gases
In: Physics
A) Identify two articles from the published literature that detail FDA recommended changes to a package insert. Indicate the data that led to this decision. B) Identify a package insert from a different pharmaceutical product than atorvastatin. Compare and contrast the sections noting the similarities and dissimilarities amongst the various sections.
In: Statistics and Probability
Explain how changes in unplanned inventories can explain employment decisions by a firm and how this can be used to explain unemployment during the 1930's depression.
In: Economics
A local bar wants to see if an entry fee changes how much the customers spend on drinks. On a night with a $ entry fee the average amount spent on drinks per customer for 30 customers was $9 with a standard deviation of $4.50. On a night with no entry fee the average for 40 customers was $10.50 with a standard deviation of $5.
- What is the t-statistic you would use? Use the general formula and write your final calculation
- Sketch a t-distribution, label the t-statistic and the probability you would be interested in
In: Statistics and Probability
Acid-Base Balance
As the rate of H+ and/or PCO2 production changes in the body, what “system” acts the quickest to stabilize pH and minimize the magnitude of such changes?
Give 3 examples of substances that comprise this “system”.
Why does the blood pH change when the blood PCO2 is changed? (you should know the chemical equation that describes this relationship)
Give an example of the kind of physiological change that would CAUSE an increase in PCO2.
What would such a condition be called?
Give an example of the kind of physiological change that would CAUSE a decrease in PCO2.
What would such a condition be called?
As PCO2 of the blood decreases, what happens to the urine H+ concentration as kidneys compensate for this change? (increase, decrease, or no change)
Explain what the kidneys are doing that makes the H+ concentration change in this manner, and how this change acts as a compensation to the decreasing PCO2.
As PCO2 of the blood decreases, what happens to the urine HCO3- concentration?
Explain what the kidneys are doing that makes the HCO3- concentration change in this manner, and how this change acts as a compensation to the decreasing PCO2.
Give an example of the kind of physiological change that would CAUSE a decrease in [H+] DIRECTLY (without causing a change in PCO2 first).
What would such a condition be called?
Give an example of the kind of physiological change that would
CAUSE an increase in [H+] DIRECTLY (without causing a change in
PCO2 first).
What would such a condition be called?
If the root cause of the H+ concentration changes is an abnormality of the kidneys, how might the respiratory system respond to:
a. an increasing H+ concentration.
b. a decrease in H+ concentration.
In: Anatomy and Physiology
As changes across industries driven by Process, People, Technology happen at a rapid pace. The quality management toolkit needs new relevance. The basic principles of Quality Management are still relevant in the 21st century. With examples, outline how enterprises are applying the QM principles such as 1) Drive out fear, so that everyone may work effectively for the Enterprise, 2) Respond quickly to employee feedback and implement corrections, 3) Break down barriers between departments and work as a team and 4) Quality is meeting the needs of the customer. Discuss how Data, Process and People are being leveraged for this purpose.
In: Mechanical Engineering
Materials are subject to changes from temperature. We know there are several states of matter; solid, liquid, gas, and plasma. However, within a solid-state, materials have their properties affected, in particular, brittleness. The Liberty ships of the Second World War were often breaking from cold weather.
What causes these failures, what materials are affected, and are there any that are not? How is brittleness calculated and measured (types of measurement) and what does this means for aircraft material selection and design considerations? You may include the influence of this problem from a maintenance perspective. Your work, due in Module 3, is to write a report of a minimum of 2,000 words.
In: Mechanical Engineering
Examine for each event whether it changes the quantity of real GDP demanded or aggregate demand in Japan.
Japanese price level rises.:
Depreciation of yen attracts more tourists to Japan.:
Japan’s coal consumption rises due to a prolonged shut down of nuclear plants.
Japan’s sales tax rises.:
In: Economics