SCIN131 (SCIN131)

SCIN131 Week 2 Quiz Released: Jun 25, 2021 11:55 PM Your quiz has been submitted successfully. 3 / 3 points `Which of the following statements is true as stated by the chemist Joseph proust? Question options: All atoms of a given element have a constant composition and are different than atoms of any other element. The nucleus is a dense region of positive charge that always contains protons and neutrons. Matter cannot be either created or destroyed in a chemical reaction t...

Question 14 of 25 `Suppose you were tasked with producing some nitrogen monoxide (a.k.a. nitric oxide). I'm sure this is often requested of you. You can do it by combusting ammonia (be careful!). The equation would be as follows: 4NH3 + 5O 2→ 4NO + 6H2O. If you form 3.50 mol of water, how much NO forms? A. 2.33 mol. B. 4.00 mol. C. 4.50 mol. D. 6.75 mol. E. none of the above Feedback: Good. See section 8.6 Question 15 of 25 `Methane is also known as natural gas, and its combustion ...

Question 10 of 25 4.0/ 4.0 Points Of the pairs of names and formulas listed below, which is not correct?  A. magnesium nitrite: Mg(NO2)3  B. calcium carbonate: CaCO3  C. aluminum sulfate: Al2(SO4)3  D. potassium hydroxide: KOH  E. sodium hydrogen carbonate: NaHCO3 Feedback:Use naming rules and charge balancing. Topic discussed in 3.7 and 4.3. Question 11 of 25 4.0/ 4.0 Points Suppose you had a compound made of 1 boron and 3 fluorine atoms. What would be the correct name...

Question 7 of 25 4.0/ 4.0 Points Which of the following is the correct chemical formula for a molecule of bromine?  A. Br2  B. Br+ C. Br-  D. Br Feedback: Great! Use naming rules and charge balancing. Topic discussed in 3.7 and 4.3. Question 8 of 25 4.0/ 4.0 Points All of the following are in aqueous solution. Which is incorrectly named?  A. H3PO4, phosphoric acid  B. HCN, cyanic acid C. HCl, hydrochloric acid  D. H2CO3, carbonic acid  E. ...

Question 11 of 25 4.0/ 4.0 Points Phosphorus has the molecular formula P4, and sulfur has the molecular formula S8. How many grams of phosphorus contain the same number of molecules as 7.88 g of sulfur? • A. 7.88 g • B. None of these. • C. 3.80 g • D. 7.61 g • E. 0.263 g Feedback:Great work! Topic discussed in Chapter 2 Question 12 of 250.0/ 4.0 Points A given sample of a xenon fluoride compound contains molecules of a single type XeFn, where n is some whole number. Gi...

Question 5 of 25 4.0/ 4.0 Points An American Golden Dollar coin has a mass of approximately 8.1 grams. Which of the following represents an equivalent mass?  A. none of the above  B. 0. micrograms  C. 8,100 centigrams D. 81,000 milligrams  E. 0.0081 kilograms Feedback: Good! Prefixes and their multipliers are discussed in Chapter 1. This involves metric prefixes. Question 6 of 25 4.0/ 4.0 Points Which of the following is true of ice, water and steam?  A. they...

Question 9 of 25 4.0/ 4.0 Points `Think back to Lesson one when we talked about density. Now think about it--my kids love balloons, and then are always laying around the house. Suppose one was laying by the window at night when they went to bed, but the next day, when the sun came up, it warmed the gas (air) that was in the balloon. What would be true about the density of the air in the balloon?  A. It will increase.  B. It will remain the same.  C. It will decrease.  D. it ...

Question 6 of 25 4.0/ 4.0 Points `My kids love balloons. It's weird, really. If one of their He balloons contained exactly 1 mol of He, and I also gave them a balloon containing exactly 1 mol of oxygen gas (I know, great parenting, right?), and the atmospheric conditions were equal to standard temperature and pressure (STP), which of these statements about the balloons is true?  A. Their volumes will be the same.  B. Their masses will be equal.  C. Their volumes AND their masse...