Questions and Answers
What is the result of $(1.419 - 2.91 - 12.215) \times (4.59 - 1.761)$?
-38.8
What is the result of $(1493 + 24.79) / 0.6677$?
2.273 x 10³
Convert 4.3 miles to centimeters.
6.9 x 10⁵ cm
What is the density of an unknown solid in units of lb/ft³ if it is 12.1 g/cm³?
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1 mL is equal to 1 cm³.
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The sum of 32.255 + 2.139 should contain four significant figures.
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The length 10 cm is equal to 1000 mm.
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The product of 19.42 cm x 3.89 cm should contain three significant figures.
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$(4.0 x 10⁴) \times (6.0 x 10⁶) = 2.4 x 10^{10}$ is correct.
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What is the symbol and exponent for 'nano'?
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What is the symbol and exponent for 'kilo'?
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What is the symbol and exponent for 'centi'?
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What is the symbol and exponent for 'giga'?
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What is the symbol and exponent for 'pico'?
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What is the symbol and exponent for 'mega'?
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What is the symbol and exponent for 'deci'?
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What is the symbol and exponent for 'milli'?
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Mo has 42 protons.
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Beryllium is an alkaline earth metal.
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The symbol for silver is Si.
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Barium is a transition metal.
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The nucleus contains protons, neutrons, and electrons.
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In nature, most elements are mixtures of isotopes.
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An electron is heavier than a proton.
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Isotopes are atoms with the same number of neutrons and different numbers of protons.
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What are the protons, neutrons, and electrons in $^{138}_{56}X$?
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What are the protons, neutrons, and electrons in $^{108}_{47}X^+$?
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What are the protons, neutrons, and electrons in $^{31}_{15}X^{3-}$?
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What are the protons, neutrons, and electrons in $^{195}_{78}X$?
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What are the mass number, protons, neutrons, and electrons in $S^{2-}$?
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What are the mass number, protons, neutrons, and electrons in $Mo$?
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What are the mass number, protons, neutrons, and electrons in $O^{2-}$?
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What are the mass number, protons, neutrons, and electrons in $Mn^{4+}$?
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Study Notes
Calculations and Conversions
- Result of expression (1.419 - 2.91 - 12.215) x (4.59 - 1.761) is -38.8.
- Result of expression (1493 + 24.79) / 0.6677 is 2.273 x 10³.
- Conversion of 4.3 miles to centimeters gives 6.9 x 10⁵ cm.
- Density of an unknown solid, 12.1 g/cm³, converts to 755 lb/ft³.
Unit Relationships
- 1 mL equals 1 cm³ (True).
- The statement regarding 32.255 + 2.139 containing four significant figures is false.
- Conversion of length: 10 cm equals 1000 mm is false.
- Product of 19.42 cm x 3.89 cm should contain three significant figures (True).
Significant Figures and Exponents
- Calculation (4.0 x 10⁴) x (6.0 x 10⁶) equals 2.4 x 10¹⁰ is false.
- Nano symbol is 'n' with an exponent of 1 x 10⁻⁹.
- Kilo symbol is 'k' with an exponent of 1 x 10³.
- Centi symbol is 'c' with an exponent of 1 x 10⁻².
- Giga symbol is 'G' with an exponent of 1 x 10⁹.
- Pico symbol is 'p' with an exponent of 1 x 10⁻¹².
- Mega symbol is 'M' with an exponent of 1 x 10⁶.
- Deci symbol is 'd' with an exponent of 1 x 10⁻¹.
- Milli symbol is 'm' with an exponent of 1 x 10⁻³.
Chemical Symbols and Properties
- Molybdenum (Mo) has 42 protons (True).
- Beryllium is classified as an alkaline earth metal (True).
- The symbol for silver is 'Ag'; 'Si' is incorrect (False).
- Barium is not a transition metal (False).
- The nucleus does not contain electrons (False).
- Most elements in nature exist as mixtures of isotopes (True).
- An electron is lighter than a proton (False).
- Isotopes are atoms with the same number of protons but different numbers of neutrons (False).
Isotope Information
- Isotope ¹³⁸₅₆X corresponds to Barium (Ba) with 56 protons, 82 neutrons, and 56 electrons.
- Isotope ¹⁰⁸₄₇X⁺ corresponds to Silver (Ag) with 47 protons, 61 neutrons, and 46 electrons.
- Isotope ³¹₁₅X³⁻ corresponds to Phosphorus (P) with 15 protons, 16 neutrons, and 18 electrons.
- Isotope ¹⁹⁵₇₈X corresponds to Platinum (Pt) with 78 protons, 117 neutrons, and 78 electrons.
Ion Information
- S²⁻ has a mass number of 33, with 16 protons, 17 neutrons, and 18 electrons.
- Molybdenum (Mo) has a mass number of 96, with 42 protons, 54 neutrons, and 42 electrons.
- O²⁻ has a mass number of 16, with 8 protons, 8 neutrons, and 10 electrons.
- Mn⁴⁺ has a mass number of 55, with 25 protons, 30 neutrons, and 21 electrons.
Studying That Suits You
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Description
Test your knowledge with these flashcards based on HW 1 for Chemistry 102. The quiz covers various calculations, conversions, and density measurements. Perfect for students to reinforce their understanding of key concepts in chemistry.
