LC50 Pre-Lab Assignment

Sling Psychrometer Readings (use the table on the next page to find the Relative Humidity) Trial Outside conditions Wet Bulb Temperature Dry Bulb Temperature Relative Humidity % 1 Mostly Sunny 14 C 20 C   2 Partly cloudy 16 C 20 C   3 Sunny 10 C 22 C   4 Cloudy 22 C 22 C   PART A: Using the data above, if the Dry and Wet Bulb Temperatures are close to each other, what does that mean about the Relative Humidity? What does the Dry Bulb Temperature relate to? On a day that it is sunny outside, would you expect the wet and dry bulb temperature to be close to, or far from each other? PART B: If the Dewpoint Temperature and Temperature are far from each other, what does that mean about the relative humidity? On a day that it is raining, would you expect the Dewpoint Temperature and Temperature to be close to each other, or far from each other?

4G* all 92% Í 10:48 pm Assignment No 1 25. Cost of Milk The graph shows the increase in the price of a quart of milk. Why might the increase appear to be O larger than it really is? 25. Cost of Milk The graph shows the increase in the price of a quart of milk. Why might the increase appear to be larger than it really is? Cost of Milk $3.50 $3.50 $3.00 $2.50 $2.00 $1.50 $1.08 MILK $1.00 $0.50 MILK Fall 1988 Fall 2011

The graph below shows the pressure and volume for a sample of dry air carried out at two different constant temperatures. Volume (x 10-³ m ³) 2.5 N 1.5 1 0.5 0 50 M 100 150 Pressure (k Pa) 200 250 -T= 300 K -T200 K An isothermal change has to be carried out very slowly. Explain why this is the case. Use data from the graph and the ideal gas equation to calculate the number of moles of gas in the sample.

a) The number of kilocalories in food is determined by calorimetry techniques in which the food is burned and the amount of heat transfer is measured. How many kilocalories per gram are there in a 5.00-g peanut if the energy from burning it is transferred to 0.500 kg of water held in a 0.100-kg aluminum cup, causing a 54.9C temperature increase? (b) Compare your answer to labeling information found on a package of peanuts and comment on whether the values are consistent.

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4. In a study to estimate the proportion of residents in a certain city and its suburbs who favor the construction of a nuclear power plant, it is found that 450 of 1000 urban residents favor the construction while only 240 of 800 suburban residents are in favor. (a) Is there a significant difference between the proportion of urban and suburban residents who favor construction of the nuclear power plant? Test with p-value at a = 0.05. (b) Construct a 95% confidence interval for the difference of favor proportions between urban residents and suburban residents and test if there is a significant difference between the proportion of urban and suburban residents who favor construction of the nuclear power plant. (You need to explain how you make the conclusion). (c) By using critical region(s) test if there is a significant difference between the proportion of urban and suburban residents who favor construction of the nuclear power plant. |

Questions about noise: (1) In the Dorben Co., an all-day study revealed the following noise sources: 0.5 hrs., 100 dBA; 1 hr., 80 dBA; 3.5 hrs., 90 dBA; 3 hrs., 95 dBA. What is the dose exposure? (Please keep the integer) (2) John Smith experiences an 8-hour noise dose of 120 by spending one hours in Room #1 with a known noise level of 100 dBA and another seven hours in Room #2 with an unknown noise level. (Please keep two decimal places) a) Based on the calculation of 120 noise dose, what is the time permitted in Room #2 with this unknown noise level? hr By using computational formula, what is the corresponding noise level in Room #2? b) What should the maximum noise level be in Room #2 for John Smith to remain within OSHA compliance? dBA Also, what is the time permitted in Room #2 with this noise level? dBA hr

A mixture of two gases A and B, exists at pressure p1, volume V, and pressure T1, Gas A is subsequently removed from the mixture in a constant- volume process. The remaining gas B is found to have a pressure p2. volume V, and temperature T2. Express the ratio of the number of moles of gas B to the number of moles of gas A in the original sample in terms of the given pressure, volume, and temperatures. C) P172-P2T2 P2T1 P2T1V D) (P1-P2)T2 P2 T1 A) P1 T2-P2 T1 P2 T2 B) P1 T1

Hypothesis: EF=ma , f=MkfN Question: Make a judgment about whether or not your hypothesis (I used EF=ma , f=MkfN) can be rejected or if it is supported based on this experiment. Justify your judgment with evidence from this experiment. What assumptions did you make? Help me with this question please

2. Conduction is function of the environment's humidity and the airflow/exchange next to the skin. True False 3. One of the amendments to Regulation 854 that came into force in 2016 is strengthening and improving requirements regarding high visibility safety apparel. True False 4. Cold stress is also known as "thermal strain". True False 5. Dynamic force presents a greater risk of strain than static force. True False 6. In underground climate, auto compression of air adds 4-60C/km to the wet bulb temperature. True False An industrial machinery gives out 112 dBA of noise 1 m away from the source, which requires double hearing protection. You are a worker performing work for 8-hrs around the machinery and you are required to wear double hearing protection. An earplug which has an NRR of 29 dB and an earmuff with an NRR of 31 dB. The suggested derrating percentage of the hearing protections are 60% and 55% of the NRR, respectively. Does the double hearing protection reduce the noise level…

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13 Physical and CMyLab & Master Chemistry Question 12 of 12 The zero order reaction A→ Products takes 63.5 minutes for the concentration of A to decrease from 0.970 M to 0.301 M. What is the value of k for this reaction? 1 4 7 +/- 1.76 x 104 M/min 2 3 5 6 8 9 0 0 M C x 10

● What factors/characteristics of: an individual (i.e., a person) might affect the toxicity of a substance on their body? potential toxicants might determine how they affect a receptor (i.e., a person)? ●