Formulas/Reactions (Blue Stamp Sheet)

Vocab: Chemical Formulas

• Contains symbols and subscripts to indicate the number of each element in a compound.

• Hard, brittle, solids that conduct electricity when molten are dissolved in water. Forms from e- transfer.

• 3-D structure of atoms and anions that are ionically bonded.

• Half the distance between two covalently bonded atoms.

Vocab: Cation

Vocab: Anion

Vocab: Polyatomic Ion

• A positive charge.

• A negative charge.

• A molecule that has lost or gained electrons has a charge. Required to have parentheses.

What charge does Ionic compounds have? Why?

• Have an electrical charge, therefore it is not neutral.

• Do not have an electrical charge, therefore they are neutral.

• Do not have an electrical charge, therefore they are not neutral.

• Have an electrical charge, therefore it is neutral.

What do Subscripts do?

• Electrons are gained to equal the electrons they lost.

• They lose electrons to form negative ions.

• Used in formulas to indicate more than one atom or ion in a compound.

What is an example of a polyatomic ion?

• (NO3-1)

• NO3-1

• NO3(-1)

• (NO)3-1

Key Ideas: Ionic compounds are made from negative ions(_____) attracting to positive ions(_____) forming a (_____) structure.

Key ideas: Ionic compounds are neutral so the total positive and total negative charges must be equal indicating that some number of electrons (_____) by the anions are (_____) by the cation.

(_____) are ALWAYS written first in the formula (or name) for an ionic compound.