Chemical Bonding
Monatomic elements consist of what?
Unbounded “like” atoms
A basic building block of matter
Is Gas a state of matter?
Yes
A mole is how many atoms?
6.02 x 10^23
What’s the name for different forms of the same element in the same state of matter
Allotropes
Polyatomic elements consist of what?
Several bonded “like” atoms
Ductile means what?
Can be pulled into wire
Name a way to separate mixtures.
Filtering, boiling, density, chromatography
How many electrons can an s orbital hold?
How many electrons can the d orbital hold?
10
Electrons will occupy what first?
Lowest energy orbital available
Homogeneous means what?
Particles evenly mixed in a solution
Is all matter made of specific compositions?
Yes
Phosgene Gas (CoCl₂) is 12.1% carbon, 16.2% oxygen, and 71.7% chlorine by mass.
Find the # of g of each element in 254 g of CoCl₂
30.70 g C
41.10 g O
182.10 g Cl
A mole is how many Atoms?
6.02 x 10^23
Are mixtures chemically bonded?
No
Endothermic change means what?
System absorbs heat/energy
Different varieties of the same element are called what?
Isotopes
A 550 g sample of chromium (III) oxide (Cr₂O₃) has 376 g Cr. How many grams of Cr and O are in a 212 g sample of (Cr₂O₃)?
145 g Cr
67 g O
Exothermic means what?
The system releases heat/energy
An alloy is what?
A homogenous mixture of metals
Extensive properties depend on what?
The amount of substance present
14
An element has 15 p+ 16n0 18e-. What is the Net Charge, Atomic Number, Mass Number, and Ion Symbol?
Net Charge:3-
Atomic Number:15
Mass Number:31
Ion Symbol:p^3-
Law of Conservation of energy states what?
No energy can be created or destroyed.