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Questions and Answers
How many neutrons are present in iodine-126? Choose only ONE best answer.
How many neutrons are present in iodine-126? Choose only ONE best answer.
How many protons are present in Al3+? Choose only ONE best answer.
How many protons are present in Al3+? Choose only ONE best answer.
How many neutrons are present in chlorine-37? Choose only ONE best answer.
How many neutrons are present in chlorine-37? Choose only ONE best answer.
How many electrons are present in an iron atom? Choose only ONE best answer.
How many electrons are present in an iron atom? Choose only ONE best answer.
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How many electrons are present in Fe2+? Choose only ONE best answer.
How many electrons are present in Fe2+? Choose only ONE best answer.
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What is the atomic mass of fluorine? Choose only ONE best answer.
What is the atomic mass of fluorine? Choose only ONE best answer.
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What is the formula weight of Ca(NO3)2? Choose only ONE best answer.
What is the formula weight of Ca(NO3)2? Choose only ONE best answer.
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What is the correct name for (NH4)2S? Choose only ONE best answer.
What is the correct name for (NH4)2S? Choose only ONE best answer.
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What is the correct name for MgSO3? Choose only ONE best answer.
What is the correct name for MgSO3? Choose only ONE best answer.
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What is the correct name for Fe2O3? Choose only ONE best answer.
What is the correct name for Fe2O3? Choose only ONE best answer.
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Give the chemical formula for titanium (IV) oxide. Choose only ONE best answer.
Give the chemical formula for titanium (IV) oxide. Choose only ONE best answer.
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What is the correct formula for potassium hypochlorite? Choose only ONE best answer.
What is the correct formula for potassium hypochlorite? Choose only ONE best answer.
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What is the correct formula for sodium dichromate? Choose only ONE best answer.
What is the correct formula for sodium dichromate? Choose only ONE best answer.
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What is the correct name for ClO3? Choose only ONE best answer.
What is the correct name for ClO3? Choose only ONE best answer.
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What is the correct name for PCl5? Choose only ONE best answer.
What is the correct name for PCl5? Choose only ONE best answer.
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What is the correct name for N2O? Choose only ONE best answer.
What is the correct name for N2O? Choose only ONE best answer.
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What is the correct formula for dinitrogen tetroxide? Choose only ONE best answer.
What is the correct formula for dinitrogen tetroxide? Choose only ONE best answer.
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Give the chemical formula for carbon tetrachloride. Choose only ONE best answer.
Give the chemical formula for carbon tetrachloride. Choose only ONE best answer.
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Give the chemical formula for tetraphosphorus decoxide. Choose only ONE best answer.
Give the chemical formula for tetraphosphorus decoxide. Choose only ONE best answer.
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What is the correct name for aqueous HBr? Choose only ONE best answer.
What is the correct name for aqueous HBr? Choose only ONE best answer.
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Study Notes
Isotopes and Neutrons
- Iodine-126 has 73 neutrons calculated by subtracting its atomic number (53 protons) from its mass number (126).
- Chlorine-37 contains 20 neutrons, derived similarly from its mass number (37) and atomic number (17).
Atomic Structure
- Aluminum Ion (Al3+) retains 13 protons, corresponding to its atomic number.
- A neutral iron atom has 26 electrons, matching its atomic number (26).
- Fe2+, indicating a loss of two electrons, has 24 electrons.
Atomic Mass
- The atomic mass of fluorine is 19.00 amu, representing the average mass of its isotopes.
Formula Weight Calculation
- The formula weight of Ca(NO3)2 totals 164 amu, calculated from its constituent atomic masses:
- Calcium (Ca) = 40
- Nitrogen (N) = 2 × 14 = 28
- Oxygen (O) = 6 × 16 = 96
- Sum = 40 + 28 + 96 = 164 amu.
Naming Ionic Compounds
- (NH4)2S is named ammonium sulfide. The name derives from the ammonium cation and the sulfide anion.
- MgSO3 is termed magnesium sulfite, following the same naming conventions for ionic compounds.
- Fe2O3 is known as iron (III) oxide, indicating iron’s +3 oxidation state.
Chemical Formulas
- Titanium (IV) oxide is represented as TiO2 due to titanium's +4 oxidation state and the oxide ion's -2 charge.
- Potassium hypochlorite is denoted as KClO, balancing the +1 charge from potassium and -1 from hypochlorite.
- Sodium dichromate is formulated as Na2Cr2O7, reflecting a 2:1 ratio of sodium to dichromate ions.
Naming Molecular Compounds
- ClO3 is referred to as chlorine trioxide following naming rules for molecular compounds.
- PCl5 is called phosphorus pentachloride, incorporating prefixes to denote the number of atoms.
- N2O is known as dinitrogen monoxide, also applying numerical prefixes.
Additional Chemical Formulas
- Dinitrogen tetroxide is represented by the formula N2O4, aligning with the prefix "tetra" for four.
- Carbon tetrachloride corresponds to CCl4, indicating four chlorine atoms bonded to a carbon.
- Tetraphosphorus decoxide is chemically noted as P4O10, showing ten oxygen atoms per four phosphorus atoms.
Naming Acids
- Aqueous HBr is termed hydrobromic acid, following the naming convention for binary acids: hydro-element-ic acid.
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Description
Test your knowledge of general chemistry with these flashcards focusing on isotopes and ions. Questions include determining the number of neutrons in iodine-126 and the number of protons in Al3+. Perfect for chemistry students preparing for exams.
