Biology A: Preparing for Quiz 1 Unit 2
In nature, on Earth, matter can exist in __________________ phases.
three
There are ____________ elements that can be found to occur in nature.
92
Exists in energy levels around the nucleus of an atom and carries a negative charge
electron
The subatomic particles/ units which govern potential chemical reactions among elements are: ___________________.
electron[s]
The common subatomic particles that make up an atom consist of protons, neutrons, and ___________________.
electrons
Which statement is correct? electrons of a neutral atom always equals the number of protons neutrons always equal the number of protons neutrons always equal the number of electrons atomic weight is identical to atomic mass
electrons of a neutral atom always equals the number of protons
Containing two atoms
diatomic
Check the correct statements regarding a compound and a molecule: a compound consists of any two or more atoms chemically bonded A compound consists of two or more distinct bonded atoms a molecule is the smallest chemical subunit of a compound a molecule may consist of two similar elements chemically bonded
A compound consists of two or more distinct bonded atoms a molecule is the smallest chemical subunit of a compound a molecule may consist of two similar elements chemically bonded
A molecule of one atom of carbon and two atoms of oxygen would be written: CO2 CO2 Co2 2CO
CO2
Each element consists of only one type of atom. True or False
True
Nitrogen gas consists of: two separate Nitrogen atoms a diatomic Nitrogen atom a molecule of two Nitrogen atoms A compound of Nitrogen atoms
a molecule of two Nitrogen atoms
The smallest unit of an element
atom
The smallest unit which retains the properties of an element is a(n) _____________________.
atom
The mass of an element
atomic mass
The number of protons in the nucleus of the atom
atomic number
Select four of the most abundant elements found in plants and animals. potassium argon carbon oxygen magnesium nitrogen sodium hydrogen
carbon oxygen nitrogen hydrogen
Atoms of two or more elements chemically bonded to one another
compound
HCl is an example of a(n): atom compound element mixture molecule
compound molecule
The area surrounding the nucleus of an atom in which electrons are normally located
energy level
Anything which occupies space and has mass
matter
What has mass and occupies space? energy matter volume density
matter
Naturally occurring compounds in the earth are called _____________________.
minerals
Two or more substances mixed together but not chemically combined
mixture
The smallest unit of a compound is a(n) _________________.
molecule
Two or more atoms held together by chemical bonds
molecule
A subatomic particle that carries no charge
neutron
Atomic mass is determined by the number of protons plus _________________.
neutrons
The positively charged center of an atom
nucleus
Any particular element can always be identified by its: number of electrons number of protons number of neutrons atomic mass
number of protons
A subatomic particle with a positive charge
proton
Each unique element is determined by the number of ___________________ occurring in the atom.
protons
Many elements exist naturally as a diatomic molecule. This means that the element is found in nature as ________________ chemically bonded atoms.
two