Biology/ Chapter 2 - Chemistry Of Life - Review
There are_________elements that can be found to occur in nature
92
Check the correct statements regarding a compound and a molecule -
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
neutron
A subatomic particle that carries no charge
proton
A subatomic particle with a positive charge
matter
Anything which occupies space and has mass
The smallest unit which retains the properties of an element is a(n)
Atom
compound
Atoms of two or more elements chemically bonded to one another
A molecule of one atom of carbon and two atoms of oxygen would be written:
CO 2
Select four of the most abundant elements found in plants and animals -
Carbon Oxygen Nitrogen Hydrogen
diatomic
Containing two atoms
The common subatomic particles that make up an atom consist of protons, neutrons, and...
Electrons
The subatomic particles/ units which govern potential chemical reactions among elements are:
Electron{s}
electron
Exists in energy levels around the nucleus of an atom and carries a negative charge
Naturally occurring compounds in the earth are called
Minerals
Atomic mass is determined by the number of protons plus
Neutrons
nucleus
The positively charged center of an atom
Which statement is correct?
electrons of a neutral atom always equals the number of protons
Each unique element is determined by the number of__________occurring in the atom
Protons
energy level
The area surrounding the nucleus of an atom in which electrons are normally located
atomic mass
The mass of an element
atomic number
The number of protons in the nucleus of the atom
atom
The smallest unit of an element
In nature, on Earth, matter can exist in__________ phases.
Three
Each element consists of only one type of atom T/F
True
Many elements exist naturally as a diatomic molecule. This means that the element is found in nature as_______chemically bonded atoms
Two
molecule
Two or more atoms held together by chemical bonds
mixture
Two or more substances mixed together but not chemically combined
Nitrogen gas consists of:
a molecule of two Nitrogen atoms
HCl is an example of a(n):
compound molecule
What has mass and occupies space?
matter
The smallest unit of a compound is a(n)
molecule
Any particular element can always be identified by its:
number of protons