Molecules and Compounds

List is ws#2

16 cards·by lulu

Chemical Change

Occurs when a chemical Reaction takes place and the atoms are rearranged to form newcompounds.

Physical Change

Occurs when the substance has changed shape or state.

Compound

A compound holds more than one element.

A Tiny 2

Subscript

A Big 2

Co-efficient

Ionic

The giving and taking of electrons.

Covalent

The sharing of electrons.

Hydrogen Bonds

Weak forces between hydrogen and other elements.

*CHNa + 5N* --> Ch + Na + 5N

Reactants

ChNa + 5N --> *Ch + Na + 5N*

Product

Law of Conservation of Matter (Mass)

Matter cannot be created nor destroyed in a chemical reaction.

Importance of a pH Scale

The pH scale goes from 0 to 14. 7 is neutral, below 7 is acidic and above 7 is basic.

Mixture

Elements not chemically connected together.

Below 7-pH scale

Acidic

Above 7-pH scale

Basic

What does --> mean?

yield/produces