Exams & Certification

Sulfur is the atom below oxygen on the periodic table. Do you hypothesize that a S-H bond or O-H bond is a better hydrogen bond donor? Why? The Correct Answer and Explanation is : The O-H bond is a better hydrogen bond donor than the S-H bond due to the higher electronegativity of oxygen compared […]

Explain the difference between (a) random and systematic error. (b) constant and proportional error. (c) absolute and relative error. (d) mean and median. Suggest two sources of systematic error and two sources of random error in measuring the width of a 3-m table with a 1-m metal rule. Name three types of systematic errors. The

What is HIPPCO? In order, what are the six largest causes of premature extinction of species resulting from human activities? Why are island species especially vulnerable to extinction? What is habitat fragmentation, and how does it threaten many species? Describe the threats to bird species in the world and in the United States. List three

For Questions 9-12, complete the analogies. omnivore: human :: carnivore: detritivore: earthworm:: herbivore: autotroph: heterotroph :: phytoplankton: biotic factor: elephant:: abiotic factor: What is the difference between a food chain and a food web? The Correct Answer and Explanation is : Here are the correct answers to the analogies: Difference Between a Food Chain and

For aluminum, the heat capacity at constant volume Cv at 30 K is 0.81 J/mol-K, and the Debye temperature is 375 K. Estimate the specific heat(a) At 50 K and(b) At 425 K. The Correct Answer and Explanation is : To estimate the specific heat of aluminum at 50 K and 425 K, we use

17.4 For aluminum, the heat capacity at constant volume Cv at 30 K is 0.81 J/mol-K and the Debye temperature is 375 K. Estimate the specific heat (a) at 50 K and (b) at 425 K. Solution (a) For aluminum, Cv at 50 K may be approximated by Equation 17.2, since this temperature is significantly

Express 36% as a fraction and simplify. Express 3/5 as a percent. (a) Express 68.5% as a decimal. (b) Express 0.035 as a percent. The Correct Answer and Explanation is : Solutions: Explanation: Understanding percentages, decimals, and fractions is essential in mathematics. Percent means “per hundred,” which is why we express 36% as 36100\frac{36}{100}. Simplifying

Which of the following is an example of an intrinsic reward? A. Recognition of accomplishments B. The satisfaction of a job well done C. A great supervisor D. An exciting assignment The Correct Answer and Explanation is : The correct answer is: B. The satisfaction of a job well done Explanation: Intrinsic rewards are internal,

Which of the following is an intrinsic reward? the trophy a boxing champion gets for winning a tournament the recognition one gets for breaking a world record the pay bonus an employee receives for a job well done the happiness one experiences while gardening The Correct Answer and Explanation is : The correct answer is:

Commercially available concentrated hydrochloric acid is 37,0% w/w HCl. Its density is 1,18 g/mL. Using this information calculate, (a) the molarity of concentrated hcl and (b) the mass and volume (in mL) of solution containing 0,315 moles of HCl The Correct Answer and Explanation is : To solve this problem, we first determine the molarity