Active Chemistry Chapter 1 Section 3

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  • 1/8 Questions

    Avogadro's number was named after the scientist Avogadro who figured out that one mole of carbon atoms is the mass of carbon 12.

    • True
    • False
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This is a quiz covering relative masses and the early development of the atom!

Active Chemistry Chapter 1 Section 3 - Quiz

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  • 2. 

    How many atoms of oxygen are there in one unit of aluminum sulfate, Al2(SO4)3?

    • 2

    • 3

    • 4

    • 12

    Correct Answer
    A. 12
    Explanation
    Anything in parentheses must be multiplied by the numbers outside and to the right of the parentheses. Since sulfate contains 4 oxygens, and there are 3 sulfate molecules, there must be this many oxygens!

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  • 3. 

    The smallest representative part of an element is:

    • An element

    • A compound

    • An atom

    • A proton

    Correct Answer
    A. An atom
    Explanation
    The word is based off of a greek word, atomos, meaning small particle. We have now found that the atom is devised of smaller parts, but for now we will focus in the basic unit.

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  • 4. 

    The Law of Definite Proportions states that:

    • Whenever two elements combine to form a compound, they do so in a definite proportion by mass.

    • Whenever two compounds combine to form an element, they do so in a definite proportion by volume.

    • Whenever two elements combine to form a compound, they do so in a definite proportion by number.

    • Water is 8 parts hydrogen and 1 part oxygen.

    Correct Answer
    A. Whenever two elements combine to form a compound, they do so in a definite proportion by mass.
    Explanation
    Mass is always conserved!

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  • 5. 

    John Dalton, when working with water, found that 7 parts of hydrogen reacted with 1 part of oxygen to form water.  This is very close to the modern measurement, where we now know that 8 parts of hydrogen react with 1 part oxygen.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    True--he was very accurate with his results using the equipment of his time...which was rare!

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  • 6. 

    What is the atomic mass of carbon?

    • 6 g

    • 6 amu's

    • 12 g

    • 12 amu's

    Correct Answer
    A. 12 amu's
    Explanation
    The atomic mass of an element is the average mass of the atoms of that element, taking into account the different isotopes and their abundances. Carbon has two naturally occurring isotopes, carbon-12 and carbon-13, with atomic masses of 12 amu and 13 amu respectively. The atomic mass of carbon is calculated by taking the weighted average of these isotopes, considering their natural abundances. Therefore, the correct answer is 12 amu's.

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  • 7. 

    What is so special about 27 grams of Aluminum?

    • It is shiny

    • It contains 6.022 x 10^23 electrons

    • It is enough material to make one aluminum can

    • It is one mole of atoms of aluminum

    Correct Answer
    A. It is one mole of atoms of aluminum
    Explanation
    While aluminum is indeed shiny, the atomic mass is the mass of 1 mole of that specific element. You can see from the periodic table that the atomic mass of Al is 27 amu's, which is one mole.

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  • 8. 

    Which ending to this statement is false: Joseph Gay-Lussac was a French scientist who:

    • Did not agree with John Dalton's idea that all components to water formed one molecule.

    • Found that the volume of hydrogen was twice that of oxygen when decomposing water.

    • Determined the number of atoms in a mole using a relative mass.

    • Found that a balanced equation for the decomposition of water formed multiple water molecules.

    Correct Answer
    A. Determined the number of atoms in a mole using a relative mass.
    Explanation
    Avogadro determined the number of atoms in a mole using a relative mass of carbon!

    Review the answers to make sure you understand what Dalton did!

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  • Nov 10, 2023
    Quiz Edited by
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  • Jan 22, 2012
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    Mrspencercience
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