![alosnomolina1122](/avatars/48612.jpg)
alosnomolina1122
02.10.2019 •
Chemistry
Lily replicates an experiment that found that the number of calories in a particular food is 50 kcal. she obtained data from
five trials: 50 kcal 72 kcal, 50 kcal, 12 kcal, and 50 kcal. which best desribes her data results? a. accurate b. incorrect c. invalid d. precise
Solved
Show answers
More tips
- S Style and Beauty Ultimate Guide on How to Care for Suede Shoes...
- S Sport Running: How to Do It Right?...
- F Food and Cooking How to Cook Spaghetti Right – Secrets and Tips...
- P Philosophy Personal attitude towards Confession: how to prepare and undergo the procedure correctly?...
- H Health and Medicine Flu: How to Recognize It by the First Symptoms?...
- F Food and Cooking How to Sober Up Quickly? Important Facts and Tips...
- H Health and Medicine How to Properly Take a Blood Sugar Test?...
- H Health and Medicine Simple and Effective: How to Get Rid of Cracked Heels...
- O Other How to Choose the Best Answer to Your Question on The Grand Question ?...
- L Leisure and Entertainment History of International Women s Day: When Did the Celebration of March 8th Begin?...
Answers on questions: Chemistry
- C Chemistry Aresearcher is performing a gram stain on a specimen in a medical laboratory. she gets distracted by a phone call and accidentally uses water instead of alcohol to decolorize....
- C Chemistry What is the formation of oxides by thermal decomposition of copper hydroxide??...
- C Chemistry 5 pois Energy pyramids illustrate the transfer of 10% of the energy stored by producers flowing from the bottom level to primary consumers. What happens to the other 90% of...
- C Chemistry What is the average velocity of my bunny rabbit when she hops 6 meters to the east across the room in 11 seconds? Express your answer using the proper SI units. Round your answer...
- C Chemistry How can you identify the gas produced in a chemical reaction without observing the atoms and molecules directly?...
- C Chemistry Dane is standing on the moon holding an 8 kilogram brick 2 metres above the ground. How much energy is in the brick s gravitational potential energy store? (On the moon the...
- C Chemistry Is carbon mixed with sand a homogeneous or heterogeneous mixture...
- C Chemistry Heat is the transfer of thermal energy between objects that have different temperatures. Thermal energy always moves from an object with a higher temperature to an object with...
- C Chemistry How to draw c2i4 Lewis structure...
- C Chemistry PLS!! I really need help since I don´t understand this...
Ответ:
Explanation:
Accuracy describes how close the experimental measure is to the correct value.
In this case the number of calories found in the experiment that is being replicated would be considered as the correct value to compare: 50 kcal.
The result of the experiment carried out by Lily is the average of the five trials:
Average = ∑ measures / amount of measuresAverage = [50 kcal + 72 kcal + 50 kcal + 12 kcal + 50 kcal] / 5 = Average = 234 kcal /5 = 46.8 kcalRound to two significant figures:
Average = 47 kcalFind the error:
Error = | correct value - obtained value | / (correct value) × 100 = Error = [50 kcal - 47 kcal] / 50 kcal × 100 = 6%That is not a big error, that drives to conclude that the data results are incorrect, so discard option B (incorrect) and it is, indeed, relatively accurate.
Precision measures how close the data obtained are close to each other. You can see that there is great dispersion, since the data are in the range [12, 72], which is too big compared with the average.
Thus, at once you can conclude that the data are not precise (option D. is discarded).
You cannot talk about validity since that is more related with the experimental procedure, so discard option C.(invalid).
Ответ:
No, atoms need 8 electrons to be stable in their valence shell.