Define this
Substances that undergo a chemical change.
Reactants
What is an atom or group of atoms with a positive or negative charge?
Ion
A chemical bond that forms when atoms share electrons.
Covalent Bond
H2 + Br2 -> HBr
H2 + Br2 -> 2HBr
What is the chemical formula of water?
H2O
New substances formed as a result of a chemical change.
Products
When at atom loses an electron it forms a(n)…
Cation (for an extra 50 points, is it positive or negative?)
A chemical bond that forms when atoms exchange electrons.
Ionic Bond
C + O2 -> CO
2C + O2 -> 2CO
What type of bond does water form with itself?
Hydrogen bonds. For an extra 50 points, why is this important?
A molecule that has slight positive and negative charges due to an imbalance in the way electrons are shared.
Polar Molecule
When at atom gains an electron it forms a(n)…
Anion (for an extra 50 points, is it positive or negative?)
A chemical bond in which atoms share electrons resulting in a charge to the compound.
Polar Covalent Bond
NO2 -> NO + O2
NO2 -> 2NO + O2
What about water makes it the “universal solvent”?
It’s strong polarity. For an extra 50 points, why is this important?
The force of attraction between molecules of the same substance so that they tend to stay together.
Cohesion
Which family of elements never form ions?
Noble Gases
A chemical bond in which atoms share electrons resulting in a neutral charge to the compound.
Nonpolar Covalent Bond
Zn + HCl -> ZnCl2 + H2
Zn + 2HCl -> ZnCl2 + H2
Is water denser as a liquid or solid?
Liquid. For an extra 50 points, why is this important?
The force of attraction between molecules of different substances so that they tend to stick together.
Adhesion
Chlorine is a Group 7A element. What is the charge of a chloride ion?
1- (for an extra 50 points, explain why)
A chemical bond between two molecules with hydrogen.
Hydrogen Bond
AlBr3 + K -> KBr + Al
AlBr3 + 3K -> 3KBr + Al
What is the force of attraction between water molecules molecules so that they tend to stay together?
Cohesion. Water has one of the greatest tendencies towards cohesion. For an extra 50 points, why is this important?