Chemistry Exam 3

Radioactive decay follows ___ order kinetics

First

If a radionuclide has a half-life of 7 days, how much remains after 3 weeks?

12.5%

Splitting of a heavy nucleus into lighter nuclei is ___

Fission 

Maintaining a nuclear chain reaction at a constant rate requires a ___ mass

Critical 

Energy changes in nuclear reactions are due to changes in ___

Mass

A scintillation counter measures radioactivity based on ___

Emission of light

Which of the following has no stable isotopes?

Cf

Which of the following forms of ionizing radiation is the most penetrating?

Gamma

Current nuclear power plants rely on __ to produce energy

Fission

Organic compounds are those in which major element is __

C

Organic compounds containing sp hybridized C atoms are ___

Alkynes

Most hydrocarbon compounds are obtained from __

Petroleum

Hydrocarbons with only sp3 hybridized atoms are __

Alkanes

An alkane with seven C atoms would be a __

Heptane

Different compounds with the same chemical formula are called __

Isomers

Polypeptides contain ___

Amino acids

Which of the following is not a transition metal?

Mg

Which of the following is not characteristic of metals?

Good insulators

Which of the following is not a good ligand?

Methane

Cis- and trans- isomers are examples of ___ isomers

Geometric

Mirror images form ___ isomers

Optical

A cyclin ring structure formed by a polydentate ligand is a __

Chelate

A square planar complex has a coordination number of ___

4

Active metals must be reduced by ___

Electrolysis

The most abundant elements in the earth’s crust are ___

O and Si

Liquid air is the source of most ___

Nitrogen

The most abundant elements in the universe are ___

H and He

Which of the following is not paramagentic?

Hydrogen gas 

Which of the following exists as a monoatomic gas?

Argon

Which of the following is not an allotrope of C?

Carbon monoxide

Most nitrogen is used in the synthesis of __

Ammonia

The most electronegative halogen is ___

Fluorine

Which of the following is a strong oxidizing agent?

Ozone

Which halogen is a liquid in its elemental state?

Bromine

Which of the following can form compounds with bridging H atoms?

Boron

Oxidation involves

Loss of electrons

The species oxidized in a oxidation/reduction reaction is the ___

Reducing agent 

The electrode at which oxidation occurs is the __

Anode

Electromotive Force (EMF) is measured in __

Volls

For standard half-cell potentials, __

Conc= 1.0 M

In which of the following compounds is Cl the highest oxidation sate 

HClO4

For a galvanic cell, which of the following is correct?

Cell potential > 0

An electrolytic cell ___

Requires electrical input

Decay of unstable nuclei by emission of particles or radiation is __

Radioactivity

Beta radiation is actually comprised of __

Electrons

Beta emission will result in ___

Atomic number changes by +1

Electron capture will result in __

Atomic number changes by -1

Radioactive decay follows __ order kinetics 

1st

Which of the following is always radioactive?

Po

Splitting of a nucleus to form lighter nuclei is __

Fission

Current nuclear power plants rely on ___ as an energy source 

Fission 

Energy changes during nuclear reactions are due to a change in  ___

Mass

Formation of heavier nuclei by combination of lighter nuclei us called 

Fusion 

Electricity is produced in nuclear power plants from

Steam