Exams & Certification
In cases where the refrigerant can not be reused, due to contamination with other refrigerants, the refrigerant __. A) can be legally vented to the atmosphere, since it can’t be reclaimedB) must be destroyed by incineration at an approved facilityC) used only in small carsD) transferred into a disposable cylinder and discarded at a municipal […]
A sample of liquid mercury (Hg) has a mass of 90.3 g. a) Find the molar mass of mercury (Hg). b) Determine the number of moles (mol) of mercury in the sample. 1 mol c) Determine the number of mercury atoms in the sample. The correct answer and explanation is : Let’s go step by
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According to SAE Standard 1990, Motor Vehicle A/C R-12 recovery equipment must be capable of reducing the system pressure to _. A) a pressure of 0 PSIGB) a vacuum of 4 Inches of MercuryC) a vacuum of 15 inches of MercuryD) a vacuum of 27 inches of Mercury The correct answer and explanation is :
According to SAE Standard J1991, recycled R-12 refrigerant can not exceed what levels of contaminants? A) Refrigerant oil: 4000 PPM by weightB) Non-condensable gases (air): 330 PPM by weightC) Moisture: 15 PPM by weightD) All of the above The correct answer and explanation is : Correct Answer: D) All of the above Explanation: SAE Standard
Empty Refillable Recovery tanks should be evacuated to __ inches of mercury before being put into service. A) 0B) 4C) 27D) 29.9 The correct answer and explanation is : Correct Answer: D) 29.9 inches of mercury Explanation: When preparing an empty refillable recovery tank for service, it must be properly evacuated to 29.9 inches of
Amy, Tyrone, Nina, Jake, and Mandy are standing in line at the grocery store. Each one is wearing a different color shirt: red, green, orange, blue, and purple. Use the following information to answer the question(s). Tyrone and Nina have only two people standing between them.The person wearing the orange shirt is not standing next
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200 grams of MgCl2 are added to 1 L of liquid water at standard conditions. a) Calculate the temperature at which water will freeze at 1 atm. b) Calculate the temperature at which water will boil at 1 atm200 grams of MgCl2 are added to 1 L of liquid water at standard conditions.a) Calculate the
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Sulfuric acid, H2SO4, is a common laboratory chemical. Draw the Lewis structure of H, SO, with minimized formal charges. Include lone pairs. The correct answer and explanation is : Here is the Lewis structure of sulfuric acid (H₂SO₄), along with an explanation of how it is determined. Step 1: Count Valence Electrons Step 2: Identify
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R-134a recovery/recycling equipment or recover/recycling/recharging equipment for mobile air condition systems must meet A) DOT Standard J2788B) EPA Standard J2788C) ARI Standard J2788D) SAE Standard J2788 The correct answer and explanation is : Correct Answer: D) SAE Standard J2788 Explanation: The SAE J2788 standard, established by the Society of Automotive Engineers (SAE), sets the requirements
Which of the following statements is true about the correlation coefficient?Multiple Choice A. A negative correlation coefficient indicates a direct relationship between two quantitative variables.B. A positive correlation coefficient indicates an indirect relationship between two quantitative variables.C. A correlation coefficient of zero means that two quantitative variables are not linearly related to each other.D. The
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