Atomic Structure
What is the mass of a single atom called and what unit is it measured in?
Atomic mass; it is measured in daltons
Identify the element whose chemical symbol is He.
Helium
Which two of these are not good properties to consider when identifying a substance?
Boiling Point, Size, Melting Point, Smell, Density, Flammability
What is a polymer?
A repeating, 2d pattern of molecules that forms a larger molecule
What is the chemical formula for a molecule made of two hydrogen and one oxygen?
H2O
What is the atomic mass of chlorine?
35.45 Da
The atomic mass ___________ as you move left and down the periodic table.
Increases
What is the term for the amount of mass per unit of volume?
Density
What is a crystal?
An extended structure made of a repeating, 3d pattern of molecules.
In the molecule 3C6H12O6, what does the "3" mean?
There are 3 separate molecules.
What is an atomic number?
The number of the element on the periodic table.
Where should you look to find elements of similar properties on the periodic table?
In the same column
What is the term for one substance being completely absorbed by another substance?
Solubility.
What is the difference between a polymer and a crystal?
A crystal's molecular pattern is 3D.
In the molecule 3C6H12O6, what does the "12" mean?
There are 12 hydrogen atoms in the molecule.
Why were there blank spaces in Mendeleev's periodic table?
He was leaving space for undiscovered elements.
What is the name for the group of elements on the very far right side of the table?
Nobel Gases
Candles float on water. This means the the candle molecules are ___________ dense than the water molecules.
Less
Why does diamond and graphite have different properties despite being made of the same element and both being a crystal?
The pattern/arrangement of the crystals are different.
Why would two molecules that share the same atomic composition have different properties?
They have a different chemical structure.
What was the name for the machine used to detect atomic mass?
Mass Spectrometer
What was the man's name who created the first accepted periodic table?
Dmitri Mendeleev
Sugar is soluble in water. You notice that the lb of sugar in your cup of water is not dissolving. What can you do to fix this?
Add more water.
What is one sub-unit of a polymer called?
a monomer
Molecules are made of two or more of these building blocks.
Atoms/Elements