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Biology: Chapter 2, The Chemistry of Life
Molecules, Matter, Atoms, Ionic and Covalent Bonds
32
Biology
9th Grade
01/16/2013

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Term

What is all Life made of?



 

Definition
All life is made of Cells
Term
What is matter?
Definition
Anything that has mass and takes up space
Term
What is Energy?
Definition

Power which may be translated into motion, overcoming resistence, or effecing physical change

 

in other words, "Energy is the ability to do work"

Term
What is an Atom
Definition
An atom is a basic unit of matter
Term
 What 3 subatomic particles make up an atom?
Definition

Protons and Nuetrons form the center/nucleus

 

Electrons cirlce around the nucleus

Term
Which subatomic particle has a positive charge?
Definition

proton

 

 

(Positive Proton)

Term
Which subatomic particle has a negative charge?
Definition

electron

 

(Excited Angry Electron)

Term
Which subatomic particle has no charge?
Definition

nuetron

 

(Nuetron Nuetral)

Term
What is an element?
Definition
A chemical element is a pure substance made up of only one kind of atom
Term
The number or protons in the nucleus of an element is known as the element's ______  _______
Definition
Atomic Number
Term
If a carbon has 6 protons and 6 electrons, what is it's atomic number?
Definition
6
Term

What is a Atomic Mass?

 

Can two atoms of the same elements ever have different mass numbers?

Definition

# of protons + # of nuetrons = atomic mass

 

yes, if they are isotopes, they sometimes differ in # of nuetrons

Term
What are Isotopes?
Definition

sometimes, atoms of an element have different numbers of nuetrons.

 

For example, all carbon atoms have 6 protons, but some have 6 nuetrons, some have 7 nuetrons, and a few have 8.

 

Atoms of the same element that have different numbers of nuetrons are called isotopes 

Term
An elecron is _______ the mass of a proton
Definition
1/1840
Term
 all isotopes of an atom have the same chemical properties ?
Definition
yes, they have the same number of electrons and protons
Term

What is a compound?

How are compounds different from elements? 

Definition

A compound is a substance formed by the chemical combination of two or more elements in definite proportions. (this means that H2O is water, but H3O is not)


 

Compounds have different physical and chemical properties  from the elements they are made of

(For example, Chlorine (Cl) is a poisonous gas and Sodium (Na) is a metal, but when combined they form NaCl which is table salt. 


Term
How do atoms of elements join to form compounds?
Definition
They form chemical bonds
Term
What are valence electrons?
Definition
Valence electrons are electrons in the outermost shell or energy circle of an atom. They are very important in forming chemical bonds between atoms.
Term
What are the two main types of chemical bonds?
Definition

Ionic Bonds

 

Covalent Bonds

Term
What is another name for negatively or positively charged particles?
Definition
Ions
Term
What is a Cation?
Definition
cation is a positively charged ion
Term
What is an Anion?
Definition

An Anion is a negatively charged ion 

 

Term
How is a Cation formed?
Definition

When an atom of an element looses one or more electrons

 

 

* loosing electrons means there are more protons (+) than electrons (-) so there is a positive charge

Term
How is an Anion formed?
Definition

When an element gains one or more electrons

 

* gaining electrons means there are more electrons (-) than protons (+) so there is a negative charge

Term
How is an Ionic Bond formed?
Definition

When one or more electrons are TRANSFERED from one atom to another

 

Oppositely charged ions (Created by transferring the electrons) attract each other and from an ionic bond

 

[image]

Term
In this type of bond, electrons travel around the nucleus of both atoms
Definition
covalent bond
Term
What is the type of bond where electrons are shared by the atoms and not transferred called?
Definition
A covalent bond
Term

What is a single covalent bond?

 

What is a double covalent bond?

 

What is a triple covalent bond?

Definition

When atoms share 2 electrons 

 

 

When atoms share 4 electrons

 

 

When atoms share 6 electrons 

Term
The structure formed when atoms are joined by covalent bonds is called a
Definition

molecule

 

(smallest unit of most compounds)

Term
Does if it's two of the same element or two different elements matter for if it's a molecule?
Definition
no, both are molecules
Term

Which of these are elements?

Neon

Nitrogen

Water

Potassium

Carbon Dioxide

Music

Definition

Nitrogen

Neon

Potassium

 

 

Term

Oxygen-16 and Oxygen-18 are isotopes, this means that they...

 

a.) have the same number of protons and nuetrons

b.) have the same number of protons but different number of nuetrons

c.) have a different number of protons but the same number of nuetrons

d.) have a different number of protons and a different number of nuetrons

Definition
b.)
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