Biology Unit 2 Quiz 1

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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


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