Exam 1 Flashcards
What is a pure substance? Can it be separated?
It’s a sinlge thing/matter cannot be separated
What is a mixture? Can it be separated?
It’s a combination of 2 or more substances of things and it can be separated
What is a heterogeneous mixture and its features?
Has visibly different features, can see the different substances in the mixture
What is homogenous mixture and it’s features?
Only has one visible distinct phase (looks all the same thing)
What is an element?
A pure substance that can not be broken down (one thing)
What is a compound?
Something made up of 2 or more elements and can be broken down
What is a diatomic molecule?
A molecule that contains 2 atoms
What is a triatomic molecule?
A molecule that contains 3 atoms
What is a homoatomic molecule?
A molecule that contains the exact same atoms
What is a heteroatomic molecule?
A molecule made up of 2 or more different atoms
LOOK AT CHAPTER 1 PRACTICE PROBLEMS AND DO THEM
ANSWER IN YOUR NOTES
What are some things that are not matter?
Heat, light, electricity
How do you define solid as a state of matter?
definite shape, definite volume
How do you define liquid as a state of matter?
no shape, shape of container
How do you define gas as a state of matter?
indefinite shape, indefinite volume
How do you know if it is a physical reaction or a chemical reaction?
Physical
Color ,Oder ,Physical state ,Its Chemical identity remains the same, Substance changes its physical appearance
But its chemical composition stays the same
No new substance is formed
Chemical
Undergoes or resists change to form a new substance, A new substance is formed
What element is this? H
Hydrogen
What element is this? He
Helium
What element is this? Li
Lithium
What element is this? Na
Sodium
What element is this? K
Potassium
What element is this? Be
Beryllium
What element is this? Mg
Magnesium
What element is this? Ca
Calcium
What element is this? B
Boron
What element is this? C
Carbon
What element is this? N
Nitrogen
What element is this? O
Oxygen
What element is this? F
Fluorine
What element is this? Ne
Neon
What element is this? Al
Aluminum
What element is this? P
Phosphorous
What element is this? S
Sulfur
What element is this? Cl
Chlorine
What element is this? Br
Bromine
What element is this? I
Iodine
What element is this? Ni
Nickel
What element is this? Cu
Copper
What element is this? Zn
Zinc
What element is this? Sn
Tin
What element is this? Pb
lead
What element is this? Au
Gold
What element is this? Ag
Silver
What are exact numbers?
ANY number that has no uncertainty with it
What are some examples of defined numbers?
There are exactly 12 eggs in a dozen, things that DO NOT have to be measured
What are inexact numbers?
ANY number that has a degree of uncertainty or has to be measured
What are some examples of inexact numbers?
23.234, 0.0964, ANYTHING that needs a measuring tool
How can you tell if a number is a significant figure or not?
ALL NONE zeros (98.765)
IF zeros are sandwiched in between two non zero numbers than they are significant figures (7.80097
Leading zeros ARE NOT significant figures (0.0099)
IF trailing zeros HAVE a decimal point then they are significant figures (985.000) BUT IF NOT then they are NOT significant figures (987,000)
Density = WHAT?
Density = Mass/Volume
