Module 0 Homework: Intro to Mastering Chemistry,

Part B: When numbers are very small or very large, it is convenient to either express the value in scientific notation and/or by using a prefix with the unit. A pain-relieving pill has a mass of 0.005 gg. Express the pill's mass in grams using scientific notation or in milligrams. Express your answer in scientific notation to one significant figure or use a prefix on the unit.

Because 1 milligram=10−3 grams1 milligram=10−3 grams, you can enter your answer as 5×10−3 g5×10−3 g or 5 mg answer: 5*10^-3 hint:How to interpret the prefix milli The prefix mm (milli) implies multiplication by 10−310−3; thus, a milligram is 1×10−3 g1×10−3 g.

Part:A Answer the following question by entering the numeric value with appropriate units. If the length of one side of a square is 12.0 mm, what is the perimeter of the square? Express the perimeter with the appropriate units.

Because a square has four sides of equal length, the perimeter is12 m+12 m+12 m+12 m=48.0 m12 m+12 m+12 m+12 m=48.0 mYou could also express the perimeter in equivalent units using prefixes such as cmcm or kmkm (i.e., 4800 cmcm or 0.0480 kmkm) answer : 48m hint: Definition of a perimeter: The perimeter of a square is the sum of the lengths of all four sides of the square.

How many squares are in this 2×22×2 grid (Figure 1)

5

Part C find the volume. formula for Volume = Length * Height * Width, or V = L * H * W. where L=5.6cm W=2.1cm H=6.6cm

V=L*H*W 5.6cm*2.1cm*6.6cm= 77.61 cm^3, 6 greater than 5 so round up to 78cm^3 answer 78cm^3

Part E: Torque can be calculated by multiplying the force (NNN) applied at 90∘ to the lever arm at a distance (mm) from the pivot point (point of rotation), the compound SI unit for the torque is N⋅mN⋅m. If the force (at 90∘90∘ to the lever arm) applied is 15 N15 N and it is applied at 2.0 m2.0 m from the pivot point (point of rotation), what is the torque on the lever?

answer : 30 N*m formula for torque is t=d*f t=torque d=length of arm or distance between the pivot of acting arm f=force acting on the direction of rotation 15N, 20m, 90 degrees so, 15n*2.0m=30 N*m unit for torque is Newton Meter (N*m)

Part A: Supterm-14pose you are asked to find the area of a rectangle that is 2.1-cmcm wide by 5.6-cmcm long. Your calculator answer would be 11.76 cm2. Now suppose you are asked to enter the answer to two significant figures. (Note that if you do not round your answer to two significant figures, your answer will fall outside of the grading tolerance and be graded as incorrect.) Enter your answer to two significant figures and include the appropriate units.

answer= 12cm^2 2 sigfig round up because in 11.76 7 is greater than 5 so go up whole number

Part B: What value should you use as the area of the base when calculating the answer to Part C? What value should you use as the area of the base when calculating the answer to Part C? a.)12 cm^2 b.)2cm^2 c.)11.76cm^2 d.)11.8 cm^2

c.) 11.76cm^2

Practice entering numbers that include a power of 10 by entering the diameter of a hydrogen atom in its ground state, dH=1.06×10−10mdH=1.06×10−10m, into the answer box. Express the diameter of a ground-state hydrogen atom in meters using a power of 10. Do not enter the units; they are provided to the right of the answer box.

dHdH = 1.06*10^-10mm

Part C: The weight of an object is the product of its mass, m, and the acceleration of gravity, g (where g=9.8 m/s2g=9.8 m/s2). If an object's mass is m=10. kg m=10. kg, what is its weight?

formula for weight is W=m*g W=10kg*9.8m/s^2= 98N remeber ; 1kg*m/s^2= 1N answer :98N w=? g=9.8m/s^2 m=10kg The weight of the object is m⋅g=98 kg⋅m/s2m⋅g=98 kg⋅m/s2. Because 1 kg⋅m/s2 = 1 N1 kg⋅m/s2 = 1 N (1 newton), you can also express the answer as 98 NN, in scientific notation as 9.8×101 N9.8×101 N, or with a prefix as 0.098 kN.

part D Would an answer that generated the response below be considered correct and give you full credit?

yes

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?

144/12= 12 so 12 (dozens)

What is the magic number? (Figure 2) Note that there is a figure also associated with this part. However, the figure for Part A may still be visible on the left. To view the figure associated with Part B, click on the figure link. A new figure should appear on the left.

15x4=60 x=4 Magic number is 60

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 nnn options, you will lose 1/(n−1)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%

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 receive feedback as a reminder. Answer the following question by typing the numeric answer into the answer box. What is the sum of 9260 and 3240?

9260+3240=12500

Part A Enter the molecular formula for butane, C4H10 Express your answer as a chemical formula.

C4H10

Part D: You can enter units that are combinations of units with prefixes. However, you must maintain the same unit system given in the problem. For example, this question uses the SI unit system. Therefore an answer in U.S. customary units, such as miles per hour would not be accepted as correct. A car traveling with constant speed travels 150 kmkm in 7200 ss. What is the speed of the car?

answer : 75km/hr or 20.8m/s d=150km. s=7200s formula s=d/t find speed: s=150km/2hr=75km/hr or s=150000m/7200s=20.83 m/s note 60min=1hr 1 km=1000m Your answer 75kmhr(=2.083×10−2 kms) was either rounded differently or used a different number of significant figures than required for this part. You can enter your answer in any equivalent combination of SI units representing a distance over any period of time. For example, you could also enter 21 m/sm/s using two significant figures.

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 mm and a width of 12.0 mm. What are the perimeter and area of this rectangle?Enter the perimeter and area numerically separated by a comma. The perimeter should be given in meters and the area in square meters. Do not enter the units; they are provided to the right of the answer box.

perimeter, area = 35.0, 66.0. <---answer Hint: Find the Perimeter : The perimeter of a two-dimensional shape is the distance around the outside edge of the shape. In the case of a rectangle, there are two sides of length LLL and two sides of width WWW. Therefore, if you were to walk around the outside of a rectangle, you would walk a distance of formula: 2L+2W2L+2W or 2(L+W)2(L+W). Find the Area: The area A of a rectangle is given by the product of its length L and width W formula : A=L⋅WA=L⋅W.