Chem 102 Flashcards - HW 1
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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?

<p>755</p> Signup and view all the answers

1 mL is equal to 1 cm³.

<p>True</p> Signup and view all the answers

The sum of 32.255 + 2.139 should contain four significant figures.

<p>False</p> Signup and view all the answers

The length 10 cm is equal to 1000 mm.

<p>False</p> Signup and view all the answers

The product of 19.42 cm x 3.89 cm should contain three significant figures.

<p>True</p> Signup and view all the answers

$(4.0 x 10⁴) \times (6.0 x 10⁶) = 2.4 x 10^{10}$ is correct.

<p>False</p> Signup and view all the answers

What is the symbol and exponent for 'nano'?

<p>symbol: n, exponent: 1 x 10⁻⁹</p> Signup and view all the answers

What is the symbol and exponent for 'kilo'?

<p>symbol: k, exponent: 1 x 10³</p> Signup and view all the answers

What is the symbol and exponent for 'centi'?

<p>symbol: c, exponent: 1 x 10⁻²</p> Signup and view all the answers

What is the symbol and exponent for 'giga'?

<p>symbol: G, exponent: 1 x 10⁹</p> Signup and view all the answers

What is the symbol and exponent for 'pico'?

<p>symbol: p, exponent: 1 x 10⁻¹²</p> Signup and view all the answers

What is the symbol and exponent for 'mega'?

<p>symbol: M, exponent: 1 x 10⁶</p> Signup and view all the answers

What is the symbol and exponent for 'deci'?

<p>symbol: d, exponent: 1 x 10⁻¹</p> Signup and view all the answers

What is the symbol and exponent for 'milli'?

<p>symbol: m, exponent: 1 x 10⁻³</p> Signup and view all the answers

Mo has 42 protons.

<p>True</p> Signup and view all the answers

Beryllium is an alkaline earth metal.

<p>True</p> Signup and view all the answers

The symbol for silver is Si.

<p>False</p> Signup and view all the answers

Barium is a transition metal.

<p>False</p> Signup and view all the answers

The nucleus contains protons, neutrons, and electrons.

<p>False</p> Signup and view all the answers

In nature, most elements are mixtures of isotopes.

<p>True</p> Signup and view all the answers

An electron is heavier than a proton.

<p>False</p> Signup and view all the answers

Isotopes are atoms with the same number of neutrons and different numbers of protons.

<p>False</p> Signup and view all the answers

What are the protons, neutrons, and electrons in $^{138}_{56}X$?

<p>symbol: Ba, protons: 56, neutrons: 82, electrons: 56</p> Signup and view all the answers

What are the protons, neutrons, and electrons in $^{108}_{47}X^+$?

<p>symbol: Ag, protons: 47, neutrons: 61, electrons: 46</p> Signup and view all the answers

What are the protons, neutrons, and electrons in $^{31}_{15}X^{3-}$?

<p>symbol: P, protons: 15, neutrons: 16, electrons: 18</p> Signup and view all the answers

What are the protons, neutrons, and electrons in $^{195}_{78}X$?

<p>symbol: Pt, protons: 78, neutrons: 117, electrons: 78</p> Signup and view all the answers

What are the mass number, protons, neutrons, and electrons in $S^{2-}$?

<p>mass number: 33, protons: 16, neutrons: 17, electrons: 18</p> Signup and view all the answers

What are the mass number, protons, neutrons, and electrons in $Mo$?

<p>mass number: 96, protons: 42, neutrons: 54, electrons: 42</p> Signup and view all the answers

What are the mass number, protons, neutrons, and electrons in $O^{2-}$?

<p>mass number: 16, protons: 8, neutrons: 8, electrons: 10</p> Signup and view all the answers

What are the mass number, protons, neutrons, and electrons in $Mn^{4+}$?

<p>mass number: 55, protons: 25, neutrons: 30, electrons: 21</p> Signup and view all the answers

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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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.

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