CHEMISTRY SCIN 131 Week 4 Quizess (Questions with Correct Solutions)

CHEMISTRY SCIN 131 Week 4 Quizess (Questions with Correct Solutions) Nicotine (C10H14N2), a member of the nightshade family of plants, is an oily liquid that makes up between 0.6 to 3% of a cigarette's mass. Contact with the liquid pure form can cause death within hours, as nicotine passes through the dermis and heads directly for the bloodstream. Overdoses and death can easily occur in those smoking cigarettes with nicotine patches applied on their body. How many nicotine molecules are in 1.00 g of nicotine? • A. 3.71 x 1021 • B. 9.76 x 1025 • C. 1.02 x 10-26 • D. 2.32 x 1022 Feedback:Great! Mass percent discussed in Chapter 6.2. Question 5 of 25 4.0/ 4.0 Points The empirical formula of an organic molecule is CH; its molar mass is 104.1 g/mol. What is the molecular formula of the molecule? • A. C10H12 • B. C6H6 • C. None of these. • D. C2H4 • E. C8H8 Feedback:Great! Empirical Formula discussed in Chapter 6.2. Question 6 of 25 4.0/ 4.0 Points Salicyclic acid (C7H6O3) is commonly the active ingredient in face washes designed to help with acne. What is the mass percent of carbon in this compound? • A. 60.9% • B. 3.47% • C. 6.09% • D. 34.7% Feedback:Great! Mass percent discussed in Chapter 6.2. Question 7 of 25 4.0/ 4.0 Points `I was wading in the creek and discovered what I thought to be a small meteorite. I took it home and found its mass to be 12.00 kg. I ran some fancy schmancy chemical tests on it, and determined that the mass of nickel within the sample was 300.0 grams. What is the mass percent of nickel in the meteorite? • A. 25.00% • B. 4.000% • C. 2.500% • D. 100.0% Feedback:Great! Mass percent discussed in Chapter 6.2. Question 8 of 25 4.0/ 4.0 Points `A compound known as deuterium oxide, or "heavy water" is sometimes used in nuclear research. It is water, but each hydrogen atom in a "heavy water" molecule has a neutron in the nucleus in addition to the normal proton. So, what would be the percent hydrogen (by mass) in a "heavy water" molecule? • A. 20.1% • B. 79.9% • C. 11.2% • D. 88.8% Feedback:Great! Mass percent discussed in Chapter 6.2. Question 9 of 25 0.0/ 4.0 Points `I was wading in the creek and discovered what I thought to be a small meteorite. I took it home and found its mass to be 5.50 kg. I ran some fancy schmancy chemical tests on it, and determined that the mass of nickel within the sample was 250.0 grams. What is the mass percent of nickel in the meteorite? • A. 0.5454% • B. 0.4545%