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WattsChem

Exam Study Guide

QuestionAnswer
What are the branches of chemistry? Organic, Inorganic, Physical, Analytical, Biochemistry, Theoretical
What is a chemical? Any substance that has a definite composition
What is chemistry? The study of the composition, structure, and properties of matter, the processes that matter undergoes, and the energy changes that accompany these processes
A horizontal row of blocks in the periodic table is called Peroid
An example of a extensive phtsical property is Mass
The elements that border the zigzag line in the perodic table are metalloids
Chemical properties are changes that alter the identity of a substance
The branch of chemistry concerned with the properties, changes, and relationships between energy and matter is Physical chemistry
Applied research is carried out to solve a problem
Basic research is carried out for the sake of increasing knowledge
Quantitative observations are recorded using numerical information
Qualitative observations are recorded using non-numerical information
A testable statemet used for making predictions and carrying out futher experiments is a hypothesis
Standards are chosen because they are reproducable in another laboratory
The SI standard units for length and mass are meter and kilogram
The symbol for the metric unit used to measure mass is g
The unit m3(superscript 3) measures Volume
The symbol that represents the measured unit for volume is mL
The SI base unit for time is the second
To calculate the density of an object divide its mass by its volume
Gamma rays are begin electromagnetic waves
A neuclear particle that has about the same mass as a proton, but with no electrical charge is called a Neutron
The forces that hold the particals in the neucleus together are called nuclear forces
The discovery of the electron resulted from experiments using cathode rays
Which instrument detect radition by counting electric pulses carried by ionized gas atoms Geiger-Muller counters
What does the 218 in Polonium-218 represent the mass number
which rays have the most penetrating power Gamma Rays
reactions that affect the neucleus of an atom are called neuclear reactions
who was the schoolmaster who studied chemistry and proposed an atomic theory john dalton
isotopes of an element contain different numbers of neutrons
the distance between two successive peaks on a wave is its wavelength
a quantum of electromagnetis energy is called a photon
as it travels through space, electromagnetic radiation exhibits wavelike behavior
one of the wave properties of electromagnetic radition, such as light, is frequency
in SI the frequency of electromagnetic radiation is measured in hertz
how many quantum numbers are needed to describe the energy state of an electron in an atom 4
the number of orbitals for the d sublevel is 5
for the f sublevel the number of orbitals is 7
what is the total number of electrons needed to fill the first 2 main energy levels 10
how many electrons can occupy the s orbitals at each energy level two, if they have opposite spins
in the modern perodic table, elements are ordered according to increasing atomic number
the discovery of the Nobel Gases changed Mendeleev's by adding a new group
to which group do fluorine and chlorine belong halogens
Argon, Krypton, and Xenon are Nobel Gases
a positative ion is known as a cation
a negative ion is known as a anion
valence electrons are the electrons in the in the highest energy level
the number of valence electrons in group 17 is 7
the number of valence electrons in group 1 elements is 1
the number of valence electrons in group 2 elements are 2
a covalent bond results when _______ are shared electrons
most chemical bonds are partly ionic and partly covalent
an octet is equal to 8
Malleability and ductility are characteristiss of substances with metalic bonds
the electron-sea model of bonding represents metallic bonding
an example of a molecular formula is NH3
the chemical bond formed when 2 atoms share electrons is called covalent bond
the electrons involved in the formation of a chemical bond are called valence electrons
an example of a formula unit is NaCl
a compound that vaporizes readily at room tempature is most likely to be a molecular compound
Created by: swatts