Concept explainers
Carry out the following additions and subtractions, expressing your answer to the correct number of significant figures. Assume that all numbers are measured numbers.
- a. 237 + 37.0 + 7.0
- b. 4.000 + 4.002 + 4.20
- c. 235.45 + 37 + 36.4
- d. 3.111 – 2.07
(a)
Interpretation:
The answer for the given addition problem
Concept Introduction:
Whenever a measurement is made, the significant figures in the measured quantity give the actual measurement. For this the significant figures should be recognized first. The significant figures may be non-zero digit and zero digit. But Zero may be or may not be a significant figure. The number of significant figures in the answer after solving addition or subtraction problem is same as the number of fewest significant figures present to the right side of the decimal point of the measurement.
Answer to Problem 2.52EP
When the problem
Explanation of Solution
The number of significant figures in the answer after solving addition or subtraction problem is same as the number of fewest significant figures present to the right side of the decimal point of the measurement. For the problem,
The answer obtained is 281, but there are no decimal points in the measurements in the problem to identify the significant figures.
(b)
Interpretation:
The answer for the given addition problem
Concept Introduction:
Whenever a measurement is made, the significant figures in the measured quantity give the actual measurement. For this the significant figures should be recognized first. The significant figures may be non-zero digit and zero digit. But Zero may be or may not be a significant figure. The number of significant figures in the answer after solving addition or subtraction problem is same as the number of fewest significant figures present to the right side of the decimal point of the measurement.
Answer to Problem 2.52EP
When the problem
Explanation of Solution
The number of significant figures in the answer after solving addition or subtraction problem is same as the number of fewest significant figures present to the right side of the decimal point of the measurement. For the problem,
The fewest significant figure in the measurements of the problem is two. The answer obtained is 12.20 with two significant figures.
(c)
Interpretation:
The answer for the given addition problem
Concept Introduction:
Whenever a measurement is made, the significant figures in the measured quantity give the actual measurement. For this the significant figures should be recognized first. The significant figures may be non-zero digit and zero digit. But Zero may be or may not be a significant figure. The number of significant figures in the answer after solving addition or subtraction problem is same as the number of fewest significant figures present to the right side of the decimal point of the measurement.
Answer to Problem 2.52EP
When the problem
Explanation of Solution
The number of significant figures in the answer after solving addition or subtraction problem is same as the number of fewest significant figures present to the right side of the decimal point of the measurement. For the problem,
The answer obtained is 309, but there are no decimal points in the measurements in the problem to identify the significant figures.
(d)
Interpretation:
The answer for the given subtraction problem
Concept Introduction:
Whenever a measurement is made, the significant figures in the measured quantity give the actual measurement. For this the significant figures should be recognized first. The significant figures may be non-zero digit and zero digit. But Zero may be or may not be a significant figure. The number of significant figures in the answer after solving addition or subtraction problem is same as the number of fewest significant figures present to the right side of the decimal point of the measurement.
Answer to Problem 2.52EP
When the problem
Explanation of Solution
The number of significant figures in the answer after solving addition or subtraction problem is same as the number of fewest significant figures present to the right side of the decimal point of the measurement. For the problem,
The fewest significant figure in the measurements of the problem is two. The answer obtained is 1.04 with two significant figures.
Want to see more full solutions like this?
Chapter 2 Solutions
General, Organic, and Biological Chemistry
- What are the x and y values that you have input in the excel? I thought the x would be from the concentation and the y is from the A595 of sample minus A595 of blank but the linear equation that shows up in mine is different. It's y = 0.0443x + 0.0148.arrow_forwardCan you explain how to find the answer and the calculation?arrow_forwardIf n ≥ 100, you may use normal distribution in all cases. please do it with excel formulas.arrow_forward
- A friend breeds giant racing Rhosgobel rabbits. She is seeking your advice on how to breed faster rabbits. As per your request, she compared the mid-parent and mid-offspring running speeds. Look at the graph to the below, which of the following statements provides accurate information to your friend. 16 y = 0.0453x + 8.3165 R2 = 0.0028 14 12 10 10 15 20 Midoffspring running speed (m/s) O a. The slower rabbits will produce faster offspring than the faster rabbits in the current generation. O b.If your friend selectively breeds her fastest rabbits, you expect the next generation to be significantly faster. OC. The best way to increase running speed in the next generation would be to alter the environment, maybe increasing nutrient density of the food. O d. There is a higher degree of heritability in other populations of Rhosgobel rabbits. Midparent running speed (s/w)arrow_forwardIf the fifth Fibonacci number is 5, calculate the value of the 14th Fibonacci number. 144 233 377 610 987arrow_forwardWhat is the approximate p?apa?I've tried entering 0, 1 and 0.5 and got marked wrong for the first part. The second part is correct.arrow_forward
- I don’t understand how to get the percentage using the Arrhenius Equation in this problemarrow_forwardTwo classes were tested to compare the class average on the final exam. Both classes were given the same final exam. One class was allowed to use their study guide on the final and the other class was not. Identify the CONTROLLED VARIABLE in the problem. 37.arrow_forwardwhat does it mean if a ratio is 1.5arrow_forward
- "The Henderson-Hasselbalch equation allows us to: •1 2 3.arrow_forwardThe standard curve provided below will allow you to answer the remaining questions. Generic Standard Curve 0.7 y = 0.9425x- 0.0034 0.6 0.5 0.4 0.3 02 0.1 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Concentration (mg/ml) - Please describe two ways in which you could use this standard curve to determine the concentration of a pigment in an unknown sample.| #1: #2: -What is your rough estimation of the concentration if you determine the absorbance of a sample is 0.150? Absorbancearrow_forwardIf p = .5, calculate q, p^2, 2pq, q^2. Select all the answer below that are correct. Note p2 and p^2 are equivalent notation. q = .5 O p^2 = .25 q^2 = .25 O 2pq = .5 p = .25 %D V q = .25 O p^2 = .5 q^2 = .5 O 2pq = .25arrow_forward
- Principles Of Radiographic Imaging: An Art And A ...Health & NutritionISBN:9781337711067Author:Richard R. Carlton, Arlene M. Adler, Vesna BalacPublisher:Cengage Learning