Domanda del libro di testo
On a typical day, Sandra may encounter several situations involving measurement. State the name and type of measurement indicated by the units in each of the following:
d. An infant has a temperature of 39.2 °C.
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Ch.2 Chemistry and Measurements
Timberlake14th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9781292472249
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TOC.tableOfContents
- Ch.1 Chemistry in Our Lives19
- Ch.2 Chemistry and Measurements80
- Ch.3 Matter and Energy53
- Ch.4 Atoms and Elements58
- Ch.5 Nuclear Chemistry42
- Ch.6 Ionic and Molecular Compounds57
- Ch.7 Chemical Quantities and Reactions38
- Ch.8 Gases30
- Ch.9 Solutions50
- Ch.10 Acids and Bases and Equilibrium64
- Ch.11 Introduction to Organic Chemistry: Hydrocarbons77
- Ch.12 Alcohols, Thiols, Ethers, Aldehydes, and Ketones82
- Ch.13 Carbohydrates54
- Ch.14 Carboxylic Acids, Esters, Amines, and Amides91
- Ch.15 Lipids61
- Ch.16 Amino Acids, Proteins, and Enzymes84
- Ch.17 Nucleic Acids and Protein Synthesis86
- Ch.18 Metabolic Pathways and ATP Production73
Timberlake14th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9781292472249Non è quello che usi tu?Cambia libro di testo
Capitolo 2, Problema 13
In which of the following pairs do both numbers contain the same number of significant figures?
a. 11.0 m and 11.00 m
b. 0.0250 m and 0.205 m
c. 0.000 12 s and 12 000 s
d. 250.0 L and 2.5 × 10-2 L
Guida verificata passo dopo passo1
Step 1: Recall the rules for determining significant figures. Significant figures include all non-zero digits, any zeros between significant digits, and trailing zeros in a decimal number. Leading zeros are not significant.
Step 2: Analyze option (a): '11.0 m' has 3 significant figures because the trailing zero is significant in a decimal number. '11.00 m' has 4 significant figures because the two trailing zeros are significant. These do not have the same number of significant figures.
Step 3: Analyze option (b): '0.0250 m' has 3 significant figures because the leading zeros are not significant, but the trailing zero is. '0.205 m' also has 3 significant figures because the leading zero is not significant, but all other digits are. These have the same number of significant figures.
Step 4: Analyze option (c): '0.000 12 s' has 2 significant figures because the leading zeros are not significant. '12 000 s' has 2 significant figures if written without a decimal point, but it could have more if written with a decimal point (e.g., '12 000.' would have 5 significant figures). Without additional context, these do not necessarily have the same number of significant figures.
Step 5: Analyze option (d): '250.0 L' has 4 significant figures because the trailing zero is significant in a decimal number. '2.5 x 10⁻² L' has 2 significant figures because only the digits in the coefficient are counted in scientific notation. These do not have the same number of significant figures.
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Significant Figures
Significant figures are the digits in a number that contribute to its precision. This includes all non-zero digits, any zeros between significant digits, and trailing zeros in the decimal portion. Understanding significant figures is crucial for accurately reporting measurements and ensuring that calculations reflect the precision of the data.
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Percorso guidato
01:09
Significant Figures (Simplified) Example 2
Rules for Counting Significant Figures
There are specific rules for determining the number of significant figures in a number. For example, leading zeros are not counted, while trailing zeros in a decimal number are significant. Knowing these rules helps in comparing the significant figures of different numbers, which is essential for the question at hand.
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Percorso guidato
01:09Significant Figures (Simplified) Example 2
Scientific Notation
Scientific notation is a way of expressing numbers that are too large or too small in a compact form, using powers of ten. It helps in clearly indicating the number of significant figures, especially when dealing with very small or very large values. Understanding how to interpret numbers in scientific notation is important for evaluating significant figures in the context of the question.
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Percorso guidato
01:41Scientific Notation
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On a typical day, Sandra may encounter several situations involving measurement. State the name and type of measurement indicated by the units in each of the following:
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