Introduction to Mastering Chemistry

Part D Enter the chemical equation 2H+(aq)+S2−(aq)→H2S(g).

2H+(aq)+S2−(aq)→H2S(g)

Part B What is the magic number? (Figure 2)

60

Part B Enter the symbol of a sodium ion, Na+, followed by the formula of a sulfate ion, SO42−. Separate the ions with a comma only—spaces are not allowed.

Na+,SO42−

Part D If you are asked to provide a set of two or more numeric answers, separate them with commas. For example, to provide the year that Sputnik (the first satellite to be sent into orbit around the Earth) was launched and the year humans first walked on the Moon, you would enter 1957,1969 in the answer box. A rectangle has a length of 5.50 m and a width of 12.0 m. What are the perimeter and area of this rectangle?

perimeter, area = 35.0,66.0 m, m2

Part B When entering large numbers in the answer box, do not use commas. For example, enter 1276400 for the number 1,276,400. Do not enter 1,276,400. If you accidentally enter commas, you will get a message that your answer has the wrong number of terms. Answer the following question by typing the numeric answer into the answer box. What is the sum of 9260 and 3240?

sum = 12500

Part C Enter the expression 147N+α, where α is the lowercase Greek letter alpha.

147N+α

Part A Enter the molecular formula for butane, C4H10.

C4H10

Part C Practice entering numbers that include a power of 10 by entering the diameter of a hydrogen atom in its ground state, dH=1.06×10−10m, into the answer box.

dH = 1.06×10−10 m

Part C Multiple-choice questions have a special grading rule determined by your instructor. Assume that your instructor has decided to grade these questions in the following way: If you submit an incorrect answer to a multiple-choice question with n options, you will lose 1/(n−1) of the credit for that question. Just like the similar multiple-choice penalty on most standardized tests, this rule is necessary to prevent random guessing. If a multiple-choice question has five answer choices and you submit one wrong answer before getting the question correct, how much credit will you lose for that part of the question?

25%

Part A How many squares are in this 2×2 grid (Figure 1) ? Note that the figure link lets you know that a figure goes along with this part. This figure is available to the left.

5

In the structure shown, each vertices is a carbon atom. For example, the ring has six carbon atoms and the chain has three carbon atoms, two of which participate in the triple bond. Draw the molecule on the canvas by choosing buttons from the Tools (for bonds and charges), Atoms, and Templates toolbars.

See Set Description

Part A For most answers, you will simply enter your numeric answer directly into the space provided to the right of the equal sign. Answer the following question by typing the numeric answer into the answer box. If you have a gross of items, you have 144 items. If you buy a gross of eggs, how many dozen eggs do you have?

number of eggs = 12 dozen