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Questions and Answers
What is the result of $(1.419 - 2.91 - 12.215) \times (4.59 - 1.761)$?
What is the result of $(1.419 - 2.91 - 12.215) \times (4.59 - 1.761)$?
-38.8
What is the result of $(1493 + 24.79) / 0.6677$?
What is the result of $(1493 + 24.79) / 0.6677$?
2.273 x 10³
Convert 4.3 miles to centimeters.
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?
What is the density of an unknown solid in units of lb/ft³ if it is 12.1 g/cm³?
1 mL is equal to 1 cm³.
1 mL is equal to 1 cm³.
The sum of 32.255 + 2.139 should contain four significant figures.
The sum of 32.255 + 2.139 should contain four significant figures.
The length 10 cm is equal to 1000 mm.
The length 10 cm is equal to 1000 mm.
The product of 19.42 cm x 3.89 cm should contain three significant figures.
The product of 19.42 cm x 3.89 cm should contain three significant figures.
$(4.0 x 10⁴) \times (6.0 x 10⁶) = 2.4 x 10^{10}$ is correct.
$(4.0 x 10⁴) \times (6.0 x 10⁶) = 2.4 x 10^{10}$ is correct.
What is the symbol and exponent for 'nano'?
What is the symbol and exponent for 'nano'?
What is the symbol and exponent for 'kilo'?
What is the symbol and exponent for 'kilo'?
What is the symbol and exponent for 'centi'?
What is the symbol and exponent for 'centi'?
What is the symbol and exponent for 'giga'?
What is the symbol and exponent for 'giga'?
What is the symbol and exponent for 'pico'?
What is the symbol and exponent for 'pico'?
What is the symbol and exponent for 'mega'?
What is the symbol and exponent for 'mega'?
What is the symbol and exponent for 'deci'?
What is the symbol and exponent for 'deci'?
What is the symbol and exponent for 'milli'?
What is the symbol and exponent for 'milli'?
Mo has 42 protons.
Mo has 42 protons.
Beryllium is an alkaline earth metal.
Beryllium is an alkaline earth metal.
The symbol for silver is Si.
The symbol for silver is Si.
Barium is a transition metal.
Barium is a transition metal.
The nucleus contains protons, neutrons, and electrons.
The nucleus contains protons, neutrons, and electrons.
In nature, most elements are mixtures of isotopes.
In nature, most elements are mixtures of isotopes.
An electron is heavier than a proton.
An electron is heavier than a proton.
Isotopes are atoms with the same number of neutrons and different numbers of protons.
Isotopes are atoms with the same number of neutrons and different numbers of protons.
What are the protons, neutrons, and electrons in $^{138}_{56}X$?
What are the protons, neutrons, and electrons in $^{138}_{56}X$?
What are the protons, neutrons, and electrons in $^{108}_{47}X^+$?
What are the protons, neutrons, and electrons in $^{108}_{47}X^+$?
What are the protons, neutrons, and electrons in $^{31}_{15}X^{3-}$?
What are the protons, neutrons, and electrons in $^{31}_{15}X^{3-}$?
What are the protons, neutrons, and electrons in $^{195}_{78}X$?
What are the protons, neutrons, and electrons in $^{195}_{78}X$?
What are the mass number, protons, neutrons, and electrons in $S^{2-}$?
What are the mass number, protons, neutrons, and electrons in $S^{2-}$?
What are the mass number, protons, neutrons, and electrons in $Mo$?
What are the mass number, protons, neutrons, and electrons in $Mo$?
What are the mass number, protons, neutrons, and electrons in $O^{2-}$?
What are the mass number, protons, neutrons, and electrons in $O^{2-}$?
What are the mass number, protons, neutrons, and electrons in $Mn^{4+}$?
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.
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