Atomic Structure
What is an atom?
The smallest particle of matter.
What is a physical property? What is a chemical property?
Describe an element.
An element is one or more of the same atom and cannot be broken down further.
What is the Periodic Table?
The Periodic Table is a table listing the elements in four different ways.
Is this balanced?
2H2+O2 > 2H2O
Yes
What is the charge of a proton and electron?
Answer format: ________, ________ (respectively)
positive, negative
List some physical properties.
Temperature, size, state of matter, color, etc...
Describe a compound.
A compound is a combination of chemically combined elements that can only be broken down through chemical methods.
How many elements are in the Periodic Table?
118 (although more than 118 has been theorized, but not yet made or observed.)
True or False:
We can only change coefficients on one side of the equation.
False
The amount of neutrons is the atomic mass minus ______.
protons
Is the ability to burn a chemical change?
Yes.
What is a mixture?
Mixtures are a mixture of compounds NOT chemically combined and can be easily separated by physical means.
How many families and periods are there?
18, 7
True or False:
Coefficients can only be whole numbers.
True
True or False:
Electrons are more massive than protons or neutrons.
false
What are physical changes? What are chemical changes?
Physical changes don't change composition of matter and can be reversed. Chemical changes change the composition of matter and cannot be reversed.
Is saltwater a compound or mixture?
Mixture.
What are metals, nonmetals and metalloids?
Metals are shiny, can conduct heat/electricity, and are malleable, while nonmetals are dull, are insulators, and are brittle. Metalloids are in between.
It should be the same for each element on both sides.
The amount of neutrons in Phosphorus (30.974) is __.
Answer in this format: 1st blank, second blank
16
X element rusts and breaks. Describe the sequence of changes, and explain the changes.
Answer Format: _, _, reasons
Use C for chemical changes and P for physical.
C, P, the reason why is because rusting is a chemical change as it reacts with oxygen gradually and breaking is a physical change, as it can be observed.
Describe heterogeneous and homogeneous mixtures.
Heterogeneous mixtures have visible particles, while homogeneous mixtures have particles invisible to the naked eye, and appears as one substance.
Where are metalloids located on the periodic table?
Fill in the blanks.
_NO2 > _NO + _O2
Fill with whole numbers only. Fill respectively in this format: _, _, _
2, 2, 1