Questions and Answers
The SI Unit for 'Amount of Substance' is the....
The number of representative particles in the unit of moles is called _____ _____.
Avogadro's Number
Avogadro's Number is numerically equal to....
6.02 x 10^23
The representative particle of an ionic compound is the....
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The representative particle of an element is the....
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The representative particle of a molecular compound is the....
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The mass of a mole of an element is called its....
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The mass of a mole of an element is equal to its _____ _____ _____ from the periodic table, expressed in grams.
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To find the mass of a mole of a compound, you must know the _____ _____ of the compound.
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Equal volumes of gases at the same temperature and pressure contain equal numbers of particles. This is known as _____ _____.
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STP stands for....
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The amount of space occupied by one mole of gas at STP is called the _____ _____ and is numerically equal to ___L.
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The relative amounts of elements in a compound are expressed as the _____ _____.
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The lowest whole number ratio of atoms or moles of elements in a compound is known as the _____ formula.
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Percent composition is the accepted formula for _____ compounds.
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The molar mass of the empirical formula is called the _____ _____ _____, or efm.
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A piece of equipment used by chemists to determine molar mass is called the _____ _____.
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The accepted formula for a molecular compound is called the _____ formula.
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The molecular formula of a compound is either the same as its empirical formula or a simple whole-number _____ of its empirical formula.
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An ionic compound that contains water molecules as an internal part of its crystal structure is a _____.
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The water contained in the crystal of a hydrate is called the _____ __ _____.
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Density (D) = ?
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Study Notes
Units and Definitions
- The SI unit for "amount of substance" is the mole.
- Avogadro's Number represents the number of representative particles in one mole, equal to 6.02 x 10^23.
Representative Particles
- The representative particle of an ionic compound is termed a formula unit.
- For elemental substances, the representative particle is an atom.
- Molecular compounds have molecules as their representative particles.
Mass and Chemical Properties
- Molar mass is defined as the mass of one mole of an element.
- The mass of a mole of an element corresponds to its average atomic mass from the periodic table, expressed in grams.
- To determine the mass of a mole of a compound, one must know its chemical formula.
Gas Laws and Hypotheses
- Avogadro's Hypothesis states that equal volumes of gases at the same temperature and pressure contain an equal number of particles.
- STP (Standard Temperature and Pressure) is defined as 0°C and 1 atm pressure.
- One mole of gas occupies 22.4 liters at STP, known as molar volume.
Composition and Formulas
- Percent composition expresses the relative amounts of elements in a compound.
- The empirical formula provides the lowest whole number ratio of atoms or moles of elements in a compound.
- Percent composition is particularly applied to ionic compounds.
- The empirical formula mass (efm) is the molar mass of the empirical formula.
Measurement and Molecular Formulas
- A mass spectrometer is a device used to determine the molar mass of substances.
- The molecular formula of a compound can either match its empirical formula or be a simple whole-number multiple of it.
Hydrates
- A hydrate is an ionic compound that includes water molecules in its crystal structure.
- The water contained in the crystals of a hydrate is known as water of hydration.
Density Calculation
- Density (D) can be calculated using the formula: D = molar mass/molar volume.
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Description
Test your understanding of key concepts in chemistry related to moles and Avogadro's number. This quiz covers essential definitions and calculations pertaining to the amount of substance. Perfect for chemistry students looking to reinforce their knowledge of foundational topics.
