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4. |
Which two electron configurations represent elements that would have similar chemical properties? (1) 1s22s22p4 (2) 1s22s22p5 (3) [Ar]4s23d5 (4) [Ar]4s23d104p5 |
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A) |
(1) and (2) |
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B) |
(1) and (3) |
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C) |
(2) and (3) |
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D) |
(2) and (4) |
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E) |
(3) and (4) |
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5. |
Which of the following make an isoelectronic pair: Cl–, O2–, F, Ca2+, Fe3+? |
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A) |
Ca2+ and Fe3+ |
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B) |
O2– and F |
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C) |
F and Cl– |
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D) |
Cl– and Ca2+ |
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E) |
None of the above. |
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6. |
Which of the following is the electron configuration of the iron(III) ion? |
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A) |
[Ar]3d5 |
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B) |
[Ar]4s13d5 |
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C) |
[Ar]4s23d3 |
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D) |
[Ar]3d6 |
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E) |
[Ar]4s23d9 |
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7. |
Which of the following ion has unpaired electrons in its orbitals? |
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A) |
P3– |
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B) |
V5+ |
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C) |
Mg2+ |
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D) |
Sc2+ |
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E) |
S2- |
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In: Chemistry
|
Consider the following time series data:
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||||||||||||||||||||||||||
| - Select your answer -Graph (i)Graph (ii)Graph (iii)Graph (iv)Item 1 | ||||||||||||||||||||||||||
| What type of pattern exists in the data? | ||||||||||||||||||||||||||
| - Select your answer -Positive trend patternHorizontal patternVertical patternNegative trend patternItem 2 | ||||||||||||||||||||||||||
| (b) | Develop a three-month moving average for this time series. Compute MSE and a forecast for month 8. | |||||||||||||||||||||||||
| If required, round your answers to two decimal places. Do not round intermediate calculation. | ||||||||||||||||||||||||||
| MSE: | ||||||||||||||||||||||||||
| The forecast for month 8: | ||||||||||||||||||||||||||
| (c) | Use α = 0.2 to compute the exponential smoothing values for the time series. Compute MSE and a forecast for month 8. | |||||||||||||||||||||||||
| If required, round your answers to two decimal places. Do not round intermediate calculation. | ||||||||||||||||||||||||||
| MSE: | ||||||||||||||||||||||||||
| The forecast for month 8: | ||||||||||||||||||||||||||
| (d) | Compare the three-month moving average forecast with the exponential smoothing forecast using α = 0.2. Which appears to provide the better forecast based on MSE? | |||||||||||||||||||||||||
| - Select your answer -3-month moving average exponential smoothingItem 7 | ||||||||||||||||||||||||||
| (e) | Use trial and error to find a value of the exponential smoothing coefficient α that results in the smallest MSE. | |||||||||||||||||||||||||
| If required, round your answer to two decimal places. | ||||||||||||||||||||||||||
| α = |
In: Statistics and Probability
4. Consider the following three IC curves:
PG1 = -100+50(IC) 1 – 2 (IC)12
PG2 = -150+60(IC) 2 – 2.5 (IC)22
PG3 = -80+40(IC) 3 – 1.8 (IC)32
Where ICs are in Rs/MWh and PGS are in MW. The total load at a certain hour of the day is 400 MW. Neglect transmission loss and develop a computer programme for optimum generation scheduling within and accuracy of + 0.05 MW
In: Mechanical Engineering
Consider the following time series:
Period 1, 2, 3, 4, 5, 6, 7, 8
Demand 15, 17, 14, 7, 10, 12, 7, 5
A. using a trend projection, forecast the demand for period 9
b. calculate the MAD for this forecast
SHOW ALL WORK! DO NOT USE EXCEL OR PHSTAT!
In: Statistics and Probability
In: Economics
10. For what values of x in the interval [1, 4] does the graph of f(x)=−x^3+6x^2 −9x−1 satisfy Rolle’s Theorem? Include a sketch and a brief explanation of what’s going on in this problem.
11. Evaluate each limit. Provide a brief explanation of how you can apply the “top heavy, bottom heavy, it’s a tie” strategy.
lim x→∞ 1 / (2x+sinx)
12) Draw a diagram and solve: What is the exact area of the biggest isosceles triangle you can inscribe above the x-axis and under the parabola y=4−x2? Hint: the vertex of the riangle is at the origin an the base of the triangle is parallel to the x-axis
In: Math
| Index | Temperature (F) | Pair of Gloves |
| 1 | 72 | 37 |
| 2 | 71 | 37 |
| 3 | 78 | 32 |
| 4 | 75 | 36 |
| 5 | 81 | 33 |
| 6 | 77 | 35 |
| 7 | 68 | 39 |
Calculate r and r2 and explain what they mean. r & r2 refer to differences in fluctuation between two variables.
In: Statistics and Probability
Discuss the following types of quantitative research (1) Narrative research (2)phenomenology research (3) action research (4) ethnographical research (5) historical research
In: Statistics and Probability
Discuss the following types of quantitative research (1) Narrative research (2)phenomenology research (3) action research (4) ethnographical research (5) historical research
In: Statistics and Probability
1) Elipse. Calculate 5 pixels, if Rx= 4, Ry= 7, Xc= 0, Yc= 0
2) Circle line. Calculate 6 pixels, if R= 14, Xc= 1, Yc= -9
I just need matematical solunations
In: Advanced Math