General Chemistry - Standalone book (MindTap Course List)
11th Edition
ISBN:9781305580343
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Chapter1: Chemistry And Measurement
Section: Chapter Questions
Problem 1.35QP: For these questions, be sure to apply the rules for significant figures. a You are conducting an...
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Concept explainers
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
Question
Transcribed Image Text:2. Express the number 500 cm so it is clear that there are only two significant figures.
5.0 x10?
Problems
1. The mass of a gold coin was measured three times and each measurement was made to five digits.
The mass values were 23.319 g, 23.341 g, and 23.296 g. The average mass was reported as 23.32 g–The
actual mass of the coin is 25.5631 g.
a. Are the measurements precise? Explain your answer.
b. At what place value is the repeated measurement no longer reproducible (uncertain)?
c. Why is the average mass of the gold coin reported to only four significant figures?
d. Are the measurements accurate? Explain your answer.
acce
e. What is the accuracy (percent error) of the average of the three measurements?
f. Why is the following statement not considered a description of accuracy?
"The differences between each measurement is small, so the data is really accurate".
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