Describe the main property associated with the Noble Gases and explain the reasons why these elements have this property.
The Noble Gases are highly unreactive. Their last shell is completely filled with electrons and they don't react with other elements because they don't need to lose or gain electrons for the atom to become more stable.
300
What does the atomic number of an atom tell us?
It tells us the number of protons in an atom.
300
What is the common name for H2SO4?
Sulfuric Acid
300
Name a toxic metal we have discussed in class and describe why it is so harmful.
The heavy metals: Mercury, Arsenic, Lead.
These metals are harmful because the human body cannot excrete them and they accumulate in the organs.
300
Describe the process of distillation and explain how it can be used for separation using a specific example.
Distillation can be used to separate a mixture of salt (solute) and water (solution) by the process of evaporation and then condensation to collect the water in one flask while the salt remains in the other.
It can also be used to separate two liquids like alcohol and water due to the different boiling points.
400
Using your understanding of sub-atomic particles, explain why metals conduct electricity.
Metals conduct electricity because they contain loosely held electrons in their outer shell and these electrons are free to move around the positive nuclei of the atoms.
400
What is the atomic mass of an atom and how is it calculated?
Atomic mass is the amount of matter in an atom (or how heavy an atom is). It is equal to the number of protons plus the number of neutrons.
400
What is the common name for CH4?
Methane
400
Which two elements is stainless steel made of?
Iron and Chromium
400
Use a specific example to explain why compounds don't have the same properties as their elements.
Example NaCl is made up of a very reactive metal (Na) and a poisonous gas (Cl) but when these elements are chemically joined together, they are safe enough to eat.
500
Using your understanding of sub-atomic particles, explain why metals are usually shiny.
As the electrons move around the positive nuclei of the atoms, they reflect the light and appear to be shiny.
500
What are the units to measure atomic mass?
Atomic Mass Units (AMU)
500
What is the common name for NaOH?
Sodium Hydroxide
500
Name two metals that don't corrode.
Gold and Platinum
500
Name the two common allotropes of Carbon and describe the main difference in their properties.
Graphite and diamond.
Graphite is soft and diamond is the hardest substance in the world.