Terms
A chemical bond in which two atoms share one or more pairs of valence electrons
Covalent Bond
New substances formed as a result of a chemical
Products
Name 2 ways an element can achieve a stable electron configurations?
Either transferring electrons (ionic bonds) or by sharing electrons (covalent bonds)
What is the chemical formula for water?
H2O
Why are water molecules polar?
Because the oxygen atom has a greater attraction for electrons than the hydrogen atom does.
A chemical bond formed between oppositely charged ions
Ionic Bond
Numbers that appear BEFORE a formula in a chemical equation to show how many atoms or molecules of each reactant or product are involved in the reaction
Coefficients
What is a stable electron configuration?
One which the highest occupied energy level is filled with electrons
How many atoms are in CO2?
3 atoms
Why do ionic compounds include at least one metal and one nonmetal?
Ionic compounds form when cations and anions are attracted to each other. Metals form cations and nonmetals form anions. So you need one of each.
Substances that undergo a chemical change
Reactants
The force of attraction between molecules of the same substance so that they tend to stay together
Cohesion
What do you call it when the atoms all pull on electrons with the same strength, none of the electrons will spend more time around any one atom?
Used to show the number of atoms of an element in a molecule or compound
Subscripts
Chlorine is a Group 7A element. What is the charge on a chloride ion?
1-
When an atom loses an electron it forms
Cations (which are positive)
A molecule that has slight positive and negative charges due to an imbalance in the way electrons are shared
Polar Molecule
What happens to the charge on atoms when they form a polar covalent bond?
The atom with the greater attraction for electrons has a partial negative charge. Then other atom has a partial positive charge.
Used to tell how many molecules of each atom or compound is needed to balance a chemical equation
Coefficient
Balance this equation: CH4 + O2 → CO2 + H2O
CH4 + 2O2 → CO2 + 2H2O
The force of attraction between molecules of different substances so that they tend to stick together
Adhesion
When an atom gains an electron it forms
Anion
What does each dot in an electron dot diagram represent?
A valence electron
Name the element and number of each element in: AgNO3
1 silver atom, 1 nitrogen atom and 3 oxygen atoms
Balance this equation: AlBr3 + 3K → KBr + Al
AlBr3 + 3K → 3KBr + Al