Chem Review
Compound
- a substance that contains more than one kind of atom - consists of two or more atoms of different elements
Ionic Bond
- formed when electrons are gained and lost from atoms - the force of attraction between the opposite charges of the ions in an ionic compound
Unique properties of water because of hydrogen bonding
- high surface tension - high boiling point
Water
- polar molecule meaning that the opposite ends of the molecule have opposite electrical charges - polar allows it to be a versatile solvent
Number the following items in order from most acidic (1) to least acidic (most basic). Milk Tomatoes Blood Lemon Juice Lye Borax Rolaids Coffee Vinegar Stomach Fluids Pure Water Bleach Household Ammonia Baking Soda
1 - Stomach Fluids 2 - Lemon Juice 3 - Vinegar 4 - Tomatoes 5 - Coffee 6 - Milk 7 - Pure Water 8 - Blood 9 - Baking Soda 10 - Borax 11 - Rolaids 12 - Household Ammonia 13 - Bleach 14 - Lye
number 2 in the formula H2O
2 Hydrogen Atoms
Relationships between matter, atoms, elements, and compounds
MATTER makes up ATOMS ATOMS make up ELEMENTS ELEMENTS make up COMPOUNDS
Sodium Chloride
NaCl
Covalent Bond
a chemical bond that occurs when atoms share electrons
Chemical Element
a substance that contains only one kind of atom
Elements
a type of atom that has a specific number of protons Examples: Al, Cu, N, O
Ion
an atom that has an electrical charge
Matter
anything that has mass and volume
symbol in a chemical formula without a subscript
contains 1 atom of that element
Carbon Dioxide
not an element
atomic number of an element
represents the number of protons
Chemical Formula
shows the elements that make up a compound and the ratios of the atoms of those elements
Atoms
small units of matter
Isotope
when an element's atoms have different numbers of neutrons Example: Carbon-12
chemically stable atom
when its outer energy level is filled with electrons