Elements, Atoms, and Compounds
The mass number of an element equal the
What are the # of protons and neutrons?
these interactions result in atoms staying close together
What are chemical bonds?
the tendency of water molecules to stick to a penny
What is adhesion?
Household ammonia has a pH of 12; household bleach has a pH of 13. Which has more [H+]?
What is ammonia?
The vertical and horizontal rows on the periodic table
What are groups and periods?
Pure substance that cannot be broken down into other substances
What are elements?
The number of electrons in the first 2 electrons shells of an element
2,8
The tendency of water molecules to stick together
What is cohesion?
The chemical formula for water
H20
Determines the number of valance electrons
What is the group number?
Differ in the number of neutrons
What are isotopes?
type of bond that honds multiple water molecules together
What is a hydrogen bond?
The universal solvent
What is water?
This type of substance dissolves in water
What is hydrophilic?
If carbon has an atomic number of 6 and an atomic mass of 13, then how many does Carbon have
What is 7?
Number of electrons in boron if it has an atomic number of 5 and an atomic mass of 11.
What is 5?
Unequal sharing of electrons
What is a polar covalent bond?
If the [H+ ] increases, then the pH value
What is decrease?
minimize changes in pH
What are buffers?
Which of the folliwng is an example of a nonpolar molecule?
a. H20 b. CH4
What is CH4 (methane)?
Name the 6 essential elements
What are: Sulfur, Phosphorus, Oxygen, Nitrogen, Carbon, Hydrogen
Formed when electrons are transferred from a metal to a nonmetal
What are ionic bonds?
These ions can drastically affect a cell's proteins
What are hydrogen and hydroxide)
measures of how difficult it is to strech or break the surface of a liquid
What is surface tension?
The main difference between an anion and a cation
What are anions are negative charged due to to the gain of electrons and cations are positively charged due to the loss of electrons?