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Question
Significant figures allow us to estimate uncertainty in calculated values. In some circumstances, following significant figure rules can lead to estimates of uncertainty that are too high or low. This is the case for the mathematical expression below.99 1.02 = 100.98
Following the rules governing significant figures in multiplication, the answer can be rounded to 1.0 102. What is wrong with rounding this answer to two significant figures?
Answer
This answer is hidden. It contains 408 characters.
Related questions
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Hydrogen peroxide decomposes into water and oxygen in a first-order process.
H2O2(aq) H2O() + 1/2 O2(g)
At 20.0 C, the half-life for the reaction is 3.92 104 seconds. If the initial concentration of hydrogen peroxide is 0.52 M, what is the concentration after 7.00 days?
A.1.2 10-5 M
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Aqueous colloidal solutions can be classified as ________ (water-fearing), or hydrophilic (water-loving).
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A.gel
B.emulsion
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D.foam
E.sol
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At 25 C, what is the osmotic pressure of a homogeneous solution consisting of 21.0 g urea (CON2H4) diluted with water to 2.50 L? (R = 0.08206 Latm/molK)
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Q:
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Q:
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Q:
Assuming ideal behavior, which of the following aqueous solutions should have the highest boiling point?
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B.0.75 m K2SO4
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Q:
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Q:
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Q:
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What is the definition of molality?
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Q:
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Q:
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A.
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D.
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Q:
If a metal crystallizes in a face-centered cubic lattice, each metal atom has ____ "nearest neighbors."
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Q:
Arrange the three common unit cells in order from least dense to most dense packing.
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C.primitive cubic < face-centered cubic < body-centered cubic
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Q:
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B.
C.
D.
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Q:
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Q:
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Q:
All of the following relationships are true EXCEPT
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B..
C..
D..
E..
Q:
Calculate DrG for the combustion of benzene at 325 K.2 C6H6() + 15 O2(g) 12 CO2(g) + 6 H2O()Species DfH (kJ/mol) S (J/Kmol)C6H6() 49.0 173.3O2(g) 0 205.1CO2(g) -393.5 213.7H2O() -285.8 67.0A.-6386 kJ/mol-rxnB.-6078 kJ/mol-rxnC.-7251 kJ/mol-rxnD.-8611 kJ/mol-rxnE.+1431 kJ/mol-rxn
Q:
If a chemical reaction is exothermic, but not spontaneous, which of the following must be true?
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B.DrG < 0, DrS > 0 and DrH > 0
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E.DrG > 0, DrS < 0 and DrH < 0