Chemistry MID TERM
Card Set Information
Chemistry MID TERM
Chemistry Mid Term
A chemical can be defined as
any substance that has a definite composition
Which of the following is an extensive property of matter?
Which of the following is an intensive property of matter?
A measure of the quantity of matter is
Matter includes all the following except
A chemical change occurs when
a leaf changes color in the fall
Nirtogen monoxide and oxygen, both colorless gases, form a red-brown gas when mixed. Nitrogen monoxide and oxygen are called
A solid substance is
always the same shape regarless of its container
What happens to the energy in a substance when it changes state?
it changes from, but is neither destroyed nor increased
Which of the follwoing is an example of a heterogeneous mixture?
Which of the following is an example of a homogenous mixture?
All known chemical elements are organized into groups based on similar chemical properties
A team of scientists is working to discover how an enzyme affects clood cells in sheep. They are working in the field of _____ chemistry
Which of these statements does
describe a measurement standard?
A standard can be easily changed to suit the experiment
The standard base unit for mass is the
Dalton incorporated the law of conservation of mass into his atomic theory by asserting that
atoms of different elements have different properties
The principles of atomic theory recognized today were conceived by
The most common from of hydrogen has
The energy of a photon is related to its
According to the Bohr model of the atom, the single electron of a hydrogen atom circles the nucleus
All of the following describe the Heisenberg uncertainty principle
it helps to locate an electron in an atom
An orbital that can never exist according to the quantam description of the atom is
How many electrons are needed to completely fill the third main energy level if it already contains 8 electrons?
The statement that an electron occupies the lowest available energy orbital is
the Aufbau principle
The statement that no two electrons in the same atom can have the same four quantam number is
the Pauli exclusion principle
Which of the following rules requires that each of the
orbitals at a particular energy level receive one electron before any of them can have two electrons
An element with 8 electrons in its highes main energy level
The size and shape of an electron cloud are most closely related to the electron's
The idea of arranging the elemtents in the periodic table according to their chemical and physical properties is attributed to
The periodic table
was completed with the discovery of the noble gases.
A horizontal row of blocks in the periodic table is called a
When an electron is added to a neutral atom, a certain amount of energy is
either released or absorbed
The energy required to remove an electron from an atomis the atom's
When an electron is acquired by a neutral atom, the energy change is called
In the alkaline-earth group, atoms with the smallest radii
have the greatest ionization energies
What are the diatomic elements?
hydrogen, oxygen, flourine, nitrogen, bromine, chlorine, and iodine