Atoms and models
What are the subatomic particles found in each atom?
Protons, neutrons, and electrons
What does the atomic number of an element tell us?
# of Protons and electrons
C
element
How many hydrogen and oxygen atoms are in 2H2O?
H: 4
O: 2
What does the coefficient tell us?
The number of molecules
What charge do protons, neutrons, and electrons have?
+protons - positive
neutrons - neutral
electrons - negative
What does the atomic mass of an element tell us?
Total # of protons + neutrons
3Na2CO3
compound
How many molecules are in C6H12O6?
1
What does the subscript tell us?
The number of atoms within each molecule.
What is the mass of each subatomic particle
Proton - 1 AMU
Neutron - 1 AMU
Electron - 1/1850 AMU or not significant
If a substance is malleable and conducts heat well, where on the periodic table could it be located?
to the left of the zig-zag
Can be separated by filtering, evaporation, or tools like a magnet.
a mixture
How many atoms in total are in 4K3PO4?
32
How many molecules of 2Fe2O3 are represented in this chemical formula?
2
If a model has a single type if atom it represents a __
ELEMENT
Which type of elements are used in modern technology to create things like touch screens and powerful magnets. They are #21, 39, 71 and the lanthanide series.
Rare Earth Elements
Has a uniform appearance and can be separated by physical means.
homogeneous mixture
How many carbon atoms are in 3Na2CO3?
3
What are the elements and their subscripts in NaHCO3?
Sodium - 1
Hydrogen - 1
Carbon -1
Oxygen-3
If a model has dots of different colors that are drawn touching each other in a repeating pattern (all the same) what does it represent?
a compound
If an element is a brittle solid and a semiconductor, where on the period table could it be located.
on the zig-zag
Has visible particles that can be physically separated.
Heterogeneous mixture
How many total atoms are in 3Na2CO3?
18
How do you know the number of elements in the formula 3Na2CO3?
count the capital letters