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