Unit 5: Mole Concept Pre Test

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What is the mole concept?

Back

The mole concept is a method used in chemistry to quantify the amount of substance. One mole is defined as 6.022 x 10^23 particles (atoms, molecules, ions, etc.).

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How do you calculate the number of atoms in a sample?

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To calculate the number of atoms in a sample, use the formula: Number of atoms = (mass of sample in grams / molar mass) x Avogadro's number (6.022 x 10^23).

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What is Avogadro's number?

Back

Avogadro's number is 6.022 x 10^23, which is the number of particles in one mole of a substance.

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What is the difference between empirical and molecular formulas?

Back

The empirical formula shows the simplest whole-number ratio of atoms in a compound, while the molecular formula shows the actual number of atoms of each element in a molecule.

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How do you determine the molecular formula from the empirical formula?

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To determine the molecular formula, divide the molecular molar mass by the empirical formula mass, then multiply the subscripts in the empirical formula by this ratio.

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What is the empirical formula of a compound?

Back

The empirical formula is the simplest ratio of the elements in a compound, representing the relative number of atoms of each element.

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What is a molecular formula?

Back

A molecular formula indicates the actual number of each type of atom in a molecule of a compound.

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How do you convert grams to moles?

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To convert grams to moles, use the formula: Moles = mass in grams / molar mass.

Front

What is the molar mass of a compound?

Back

The molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol).

Front

What is the significance of the molecular formula C6H12O6?

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C6H12O6 is the molecular formula for glucose, indicating it contains 6 carbon, 12 hydrogen, and 6 oxygen atoms.