Biology Unit 2 Quiz 1
CO subscript 2
A molecule of one atom of carbon and two atoms of oxygen would be written: 2CO CO^2 CO subscript 2 Co2
6H2S1O4
A molecule of sulfuric acid contains two hydrogen atoms, one sulfur atom, and four oxygen atoms. Place the correct labels to indicate six molecules of this acid.
neutron
A subatomic particle that carries no charge
proton
A subatomic particle with a positive charge
number of protons
Any particular element can always be identified by its: number of electrons number of protons number of neutrons atomic mass
matter
Anything which occupies space and has mass
35
Atomic Mass for Chlorine
23
Atomic Mass for Sodium
17
Atomic Number for Chlorine
11
Atomic Number for Sodium
neutrons
Atomic mass is determined by the number of protons plus ____________________________
compound
Atoms of two or more elements chemically bonded to one another
A compound consists of two or more distinct bonded atoms a molecule may consist of two similar elements chemically bonded a molecule is the smallest chemical subunit of a compound
Check the correct statements regarding a compound and a molecule: A compound consists of two or more distinct bonded atoms a molecule may consist of two similar elements chemically bonded a compound consists of any two or more atoms chemically bonded a molecule is the smallest chemical subunit of a compound
24 48 24 4
Choose the total number of each item requested below. 4C6H12O6 Carbon atoms ______ Hydrogen atoms ______ Oxygen atoms ______ Molecules _____
diatomic
Containing two atoms
True
Each element consists of only one type of atom. True False
protons
Each unique element is determined by the number of ____________________ occurring in the atom.
electron
Exists in energy levels around the nucleus of an atom and carries a negative charge
compound molecule
HCl is an example of a(n): compound element molecule mixture atom
three
In nature, on Earth, matter can exist in ________________ phases.
two
Many elements exist naturally as a diatomic molecule. This means that the element is found in nature as __________ chemically bonded atoms.
minerals
Naturally occurring compounds in the earth are called ____________________________
nucleus
The positively charged center of an atom
a molecule of two Nitrogen atoms
Nitrogen gas consists of: a diatomic Nitrogen atom A compound of Nitrogen atoms a molecule of two Nitrogen atoms two separate Nitrogen atoms
17
Number of Electrons Chlorine Has
11
Number of Electrons Sodium Has
18
Number of Neutrons Chlorine Has
12
Number of Neutrons Sodium Has
17
Number of Protons Chlorine Has
11
Number of Protons Sodium Has
nitrogen hydrogen carbon oxygen
Select four of the most abundant elements found in plants and animals. nitrogen sodium hydrogen potassium carbon magnesium argon oxygen
Cl
Symbol for Chlorine
Na
Symbol for Sodium
energy level
The area surrounding the nucleus of an atom in which electrons are normally located
electrons
The common subatomic particles that make up an atom consist of protons, neutrons, and ______________________________
atomic mass
The mass of an element
atomic number
The number of protons in the nucleus of the atom
molecule
The smallest unit of a compound is a(n) __________________________
atom
The smallest unit of an element
atom
The smallest unit which retains the properties of an element is a(n) ____________
electron[s]
The subatomic particles/ units which govern potential chemical reactions among elements are: ____________________________ neutrons.
92
There are ______ elements that can be found to occur in nature.
molecule
Two or more atoms held together by chemical bonds
mixture
Two or more substances mixed together but not chemically combined
matter
What has mass and occupies space? volume matter energy density
electrons of a neutral atom always equals the number of protons
Which statement is correct? electrons of a neutral atom always equals the number of protons neutrons always equal the number of protons atomic weight is identical to atomic mass neutrons always equal the number of electrons
