CHEMGEN Quiz: Atoms and Atomic Structure

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m4xpayne

11 Feb 2023

School

Technological University of the Philippines

Department

Chemistry

Course

CHEMGEN

Professor

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Document Summary

It used to determine the types of isotopes present, the exact masses of these isotopes and the relative amount of each isotope present in an element. The space around the nucleus is divided into shells or main energy levels and subshells or sublevels. Showed that chemical reactions occur when electricity is passed through certain chemical solutions. His findings gave the 1st hint that atom is still contained smaller particels. Showed that if high voltage is passed through the gas discharged tube, cathode rays move from the negative electrode (cathode) to the positive electrode ( anode) Rays were observed traveling in the direction opposite of the cathode rays. Atoms have both negative and positive particles. What is the maximum number of electron can allowed in a single energy level: first level n=1, 3rd level n= 3. The average value for the isotopes of the element. It takes into account the percentage abundance of the isotopes.

Related Questions

If a current of 687.6 mA is passed through an electrochemicalcell for 56.82 minutes, what charge, in coulombs, is passed throughthe cell?

Charge passed through the cell = .6876 *(56.82*60)=2344

Suppose that the electrochemical cell consists of two copperelectrodes immersed in a copper(II) sulfate solution. At whichelectrode, anode or cathode, does reductionoccur?

The reduction occurs at the _______________?

Do you expect that this electrode will increase or decrease inmass as the electrolysis proceeds?

The mass of the electrode will____________?

Calculate the change in the mass of copper at the anode orcathode if the charge calculated above is passed through the celldescribed. Enter your answer as a positive quantity in mg.

Mass change at the electrode = ____________mg ?

1.) When balancing oxidationâreduction reactions in acidic solution by the half-reaction method, the
addition of the reactant H+ is required to balance the product
a. O2. b. OHâ. c. O. d. H2O. e. none of these

2.) Which of the following statements is true for a voltaic (galvanic) cell?
a. The electron flow is from the positive electrode to the negative electrode.
b. The electron flow is from the anode to the cathode.
c. The electron flow is from the negative cathode to the positive anode.
d. The electron flow is through the salt bridge.

3.) The anode in a voltaic cell and in an electrolytic cell is
a. the site of oxidation and of reduction, respectively.
b. the site of reduction and of oxidation, respectively.
c. the site of oxidation in both cells.
d. positive in both cells.

T F In primary Galvanic cells a current is used to drive a non-spontaneous

reaction

T F In electrochemical cells, the anode is the electrode where electrons are

gained by the species

T F In electrolytic cells, the cathode is the positive electrode.

T F It takes 1.2 X 10²⁴ electrons to reduce Sn⁺⁴ to Sn⁺²

T F In Galvanic cells the electrons are released at the anode and consumed at

the cathode.

T F The more negative the E^o value for a given reaction, the greater the

tendency for the reaction to occur in the opposite directions as written.

T F The Dry Cell (Le Chanche Cell) is an example of a secondary Voltaic cell

T F Secondary Voltaic cells are non-reversible.

CHEMGEN Quiz: Atoms and Atomic Structure

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