Unit 1B
Anything that has mass and takes up space
Matter
The weighted average of the atomic masses of the naturally occurring isotopes of an element
Average atomic mass
Greek prefix for 9
Nona-
How much in Liters @ STP is 1 mole?
22.4 Liters
What are beakers good for?
Mixing, stirring, and heating chemicals is the most common and best uses for a beaker.
A mixture in which the composition is uniform throughout
Homogenous mixture (solution)
What is the definition of Atomic number?
The number of protons in the nucleus of an atom
What is the name of this rule?
-prefix mono is only used for second element
-if first element has “subscript”, then it is not indicated
“Mono” rule
What is Avogardo’s number?
6.022 x 1023
What is a crucible?
A small clay cup made of material that can withstand extreme temparures.
Hydrogen and Iron are examples of what classification of matter?
Element (Pure Substance)
What is a Isotope?
An isotope is the atoms of the same element that have different numbers of neutrons.
What is different about ionic compound Lewis structures?
The charge is the main difference.
How do you find molar mass?
By adding the atomic mass of each element and adding them together
What flask has a round bottom and long neck and is used to hold liquids and can be easily swirled and heated?
A Boiling Flask
Acetone C3H6O is an example of a?
Compound (Pure substance)
How many neutrons are in sulfur-33?
17
What does the abbreviation VSPER stand for?
Valence-Shell-Electron-Pair-Repulsion
What is Dichlorineheptoxide (Cl2O7) percent composition?
Cl = 38.76% Cl
O - 61.24% O
What flask is named after its inventor?
Erlenmeyer Flask
What are the SI units for mass, length, time, temperature, and amount of a substance?
Kilogram, meter (m), second (s), Kelvin (K), and mole (mol)
How many protons, electrons, and neutrons does an atom with atomic number 50 and mass number 125 contain?
50 protons
50 electrons
75 neutrons
Why is the geometry of the molecule important in Molecular geometry?
It is important for telling us the chemical reactivity, solubility, and pyshcial properties
If a container has 58.6 Liters of Nitrogen gas @ STP, how many moles of Nitrogen are in the container?
2.62 moles
Where do you look at to get the measurement from when using the graduated cylinders?
Hint: Talking about the dip
The Meniscus