In which of the fo1losing pairs do both numbers contain the same number of significant figures? (2.2)
a. 2.0500 m and 0.0205 m
b. 600.0 K and 60 K
c. 0.000 75 s and 75 000 s
d. 6.240 L and
To determine:
The pairs of numbers that contain the same number of significant figures
Answer to Problem 2.81UTC
c) 0.000 75 s and 75 000 s
d) 6.240 L and 6.240 × 10-2 L
Explanation of Solution
A number is significant if it is:
- Non-zero digit.
- Any zeros between two or more non-zero digits.
- Trailing zeroes in the decimal number.
Also, note that zero placed after a non-zero digit without any decimal is simply a place holder and insignificant. Therefore, as per the above rules one can write:
a)
Number | Significant Figures |
2.0500 m | 5 |
0.0205 m | 3 |
b)
Number | Significant Figures |
600.0 K | 4 |
60 K | 1 |
c)
Number | Significant Figures |
0.000 75 s | 2 |
75 000 s | 2 |
d)
Number | Significant Figures |
6.240 L | 4 |
6.240 × 10-2 L | 4 |
The pairs of numbers in (c) and (d) have the same significant figures.
Want to see more full solutions like this?
Chapter 2 Solutions
CHEMISTRY:INTRO.GEN ORG.W/MODIFIED MAS
Additional Science Textbook Solutions
Basic Chemistry (5th Edition)
Chemistry
Living By Chemistry: First Edition Textbook
General, Organic, and Biological Chemistry (3rd Edition)
- How do you answer 1, 2, and 3? (This is a practice exercise).arrow_forwardTwo students measured the freezing point of a sample of pure benzene. Student A used an ordinary laboratory thermometer calibrated in 0.1 ℃ units. Student B used a thermometer certified by NIST (National Institute of Standards and Technology) and calibrated in 0.01 °C units. Their results were as follows: Student A: 52 °C, 5.7 °C, 5.5 °C, 5.2 °C Student B: 5.48 °C, 5.52 °C, 5.50 °C, 5.54 °C Calculate the average value for A and B and, knowing the freezing point of benzene is 5.50 °C (and using kelvins for temperature), calculate the percent error for each student. Which student has the smaller error?arrow_forwardWhich would weigh more? 100 mL of water or 100 mL of cyclohexene? (Density of water is 1.00 g/mL while the density of cyclohexene is 0.81 g/mL) Group of answer choices A. more information is needed B. cyclohexene C. the both weigh the same D. waterarrow_forward
- Which of the following pairs have a relationship that is most similar to composition? Group of answer choices 1.A toy car and Car. 2.A car and an engine. 3.A Honda Civic and Car. 4.A lock and a key.arrow_forwardThe following nutrition information is listed on a box of crackers: Serving size 0.50 oz (6 crackers) Fat 4 g per serving Sodium 140 mg per serving a. If the box has a net weight (contents only) of 8.0 oz, about how many crackers are in the box? b. If you ate 10 crackers, how many ounces of fat did you consume? c. How many servings of crackers in part a would it take to obtain the Daily Value (DV) for sodium, which is 2400 mg?arrow_forwardUsing conversion factors solve each of the following clinical problems a) The physician has order 1.0g of tetracycline to be given every six hours to a patient. If each pill contains 500mg tablets, how many would you need for a day’s treatment? b) an intramuscular medication is given at 5.00mg/Kg of body weight. What is the does if the patient weights 180lb c) a physician has order 0.50mg of atropine, intramuscularly. If atropine is available as 0.1mg/mL of solution, how many Ml would you need to give?arrow_forward
- Determine what category "150g of cheese" belong in for the following problems: "If you want to make 8 quesadillas, how many lbs of cheese are required. Each quesadilla contains 150 g of cheese." A. unit desired B. quantity C. part of a conversion fact D. none of the abovearrow_forwardA coffee-cup calorimeter contains 20 mL of water with an initial temperature of 24.8°C. An unknown sample with a mass of 1.388 grams was placed inside making the water temperature rise up to 25.5°C. The initial temperature of the metal was 72.3°C. What is the specific heat (J/ g C) of the unknown sample?___________ (round off final answer to 2 decimal places)arrow_forwardRafael tutors chemistry, For each hour that he tutors, he earns 40 dollars. His earnings, E (in dollars), after tutoring for h hours is given by the folowing function. E(h)+40harrow_forward
- lead ball is added to 158 grams of water in a coffee cup calorimeter. If the ball loses 47.35 °C of heat and the water gains 1.3 °C of heat, what would the mass of the lead ball be? (3 sf)arrow_forwardA food contains 15 grams protien, 20 grams carbs, 8 grams of fat per seving. You consumed 2.5 servings of this food, how many Kcals were consumed?arrow_forwardProfessor Gomez's dogJasper, is a very anxious little guy, so she baked him some treats that contain melatonin to help calm him down. The treats are quite small, and each one contains 150 of melatonin Jasper's veterinarian recommended he take milligrams of melatonin per of body weight per day Jasper weighs exactly 15 lbs. How many of the melatonin containing treats is he allowed to have in one day? Note : 2.20 lb=1 logarrow_forward
- Introductory Chemistry: A FoundationChemistryISBN:9781337399425Author:Steven S. Zumdahl, Donald J. DeCostePublisher:Cengage LearningChemistry & Chemical ReactivityChemistryISBN:9781133949640Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage Learning