Physical Properties
What is a physical change?
A physical change is when a substance changes state without changing its chemical composition.
How many valence electrons does Barium have?
2 valence electrons
How are ionic bonds formed? (What are the two element classifications that form ionic bonds?)
Ionic bonds are formed between metals and non-metals.
What is the chemical formula of Sodium and Chlorine?
NaCl
What is the chemical name of LiF?
Lithium Fluoride
What are 2 examples of a physical property?
Solubility, conductivity, density, mallebility, melting point, etc
What charge does Nitrogen have?
-3 charge
This type of force holds the oppositely charged ions together in an ionic compound.
Electrostatic attraction
What is the chemical formula of Magnesium and Iodine?
MgI2
What is the chemical name of AlN?
Aluminum Nitride
What is the difference between a chemical and physical change?
A physical change occurs when the substance changes state without changing its chemical composition.
A chemical change occurs when a substance changes into something new.
What charge will an element with 80 protons and 78 electrons have?
+2 charge
Which is the ionic compound: CO2 or NaF?
NaF
What is the chemical formula of Potassium and Sulfur?
K2S
What is the chemical name of Na2S?
Sodium Sulfide
Explain why ionic bonds conduct electricity when dissolved in water.
Ionic bonds conduct electricity when dissolved in water because the ionic compound fully dissociates into its ions. In this state, the charged ions can move and carry an electric current.
When sulfur forms an ion, will it gain or lose electrons?
Sulfur will gain electrons to form an ion
In an ionic bond, metals tend to do this with their valence electrons.
Metals tend to donate their valence electrons to the non-metal
What is the chemical formula of Boron and Nitrogen?
BN
What is the chemical name of BeO?
Beryllium Oxide
Explain why ionic bonds have high melting points.
Ionic bonds have high melting points because they form a crystal lattice held together by electrostatic attraction between oppositely charged ions. A large amount of energy is required to break these strong forces, resulting in a high melting temperature for ionic compounds.
How many valence electrons do most atoms like to have?
For 200 Bonus Points: Which two elements are the exception?
Most atoms want 8 valence electrons except hydrogen and helium which can only have 2
What are 3 properties of ionic bonds?
1. Dissolve in water
2. Conduct electricity when dissolved in water
2. Brittle Solids
What is the chemical formula of Calcium and Phosphorus?
Ca3P2
What is the chemical name of SrI2?
Strontium Iodide