Chemical Compounds. DO NOW Label the atom- proton, neutron, electron, nucleus. Label charges where they belong. (+) (-)

Chemical Compounds

DO NOW

Label the atom- proton, neutron, electron, nucleus. Label charges where they belong. (+) (-)

Elements• A pure substance that consists of just one type of

atom

• Classified by the number of protons/electrons

Elements• A pure substance that consists of just one type of

atom

• Classified by the number of protons/electrons

• REMEMER– the number of PROTONS is EQUAL to the number of electrons!!

“atomic number”= How many protons/electronsa Boron atom has

Elements• A pure substance that consists of just one type of

atom

• Classified by the number of protons/electrons

• REMEMER– the number of PROTONS is EQUAL to the number of electrons!!

• Atoms have NO CHARGE… NEUTRAL

CHALLENGE: What element is this??

How to solve a challenge question

• “I see that……”

• “I know that…..”

• “I think that…….”

Chemical Compounds

• 2 or more elements combined

Chemical Compounds

• 2 or more elements combined

• Example- H2O

Chemical Compounds

• 2 or more elements combined

• Example- H2O– Hydrogen Hydrogen Oxygen

(K2SO4P5) + Mg2Fe32+ (KSO4

3-)2 + KCl + CuPO42-

Chemical Compounds

• 2 or more elements combined

• Example- H2O– Hydrogen Hydrogen Oxygen

• Elements “combine” to one another by chemical bonding

Chemical Bonding

• When 2 or more elements bond together, the result is often very different than the original elements

• Bond- join, combine, or come together• Original- what you started with

Chemical Bonding

• Elements bond together, or combine/join with other elements by stealing or sharing electrons from other elements.

• Chemical bonds happen because of electrons

Ionic Bonding

• Elements take or give away electrons

Covalent Bonding

• Elements share electrons

Sodium

1

2

3

45

6

7

Sodium Chlorine

1

2

3

45

6

7

Sodium Chlorine

1

2

3

45

6

7

Sodium Chlorine

1

2

3

45

6

7

Sodium Chlorine

IONIC BONDING- stealing and giving away electrons

CHALLENGE

What do you think the charge of the sodium atom and the charge of the chlorine atom is Now that they are bonded? Why?

What do you think the charge of the sodium atom and the charge of the chlorine atom is now? Why?

CHALLENGE

REVIEW

• What is an atom?

• What are the 3 subatomic particles?

• What is the overall charge of an atom, and why?

Review

• What is an element?• What does the “atomic” number tell us?• What are some examples of elements?

Review

• What is a chemical compound?• How do chemical compounds form?

REVIEW

• How does chemical bonding happen? (what does it involve?)

• What are the 2 types of chemical bonds we have learned about?

REVIEW

• Someone explain ionic bonding.

• Some explain covalent bonding!