unit 1 alchemy -...
TRANSCRIPT
Section1DefiningMatterkids.notebook
1
September 17, 2013
Unit 1ALCHEMY
Section 1 - Defining MatterLesson 2 - Introduction Alchemist - attempted to make ____________ from other things
-Learned a lot about matter Do you know the name Nicolas Flamel from Harry Potter? Flamel wrote books about the philosopher‛s stone, which people believe could change base metals into ____________
____________ - derived from Arabic work = al-khemi
The Roots of Chemistry- Techniques & beakers, flasks, tongs, and funnels derived from alchemists
-If an alchemists develops something that appears to be gold, how do they verify?
-Made a ____________ - possible explanation for an observation-Look at PROPERTIES (Characteristics)
1) ____________ = form changes- ____________ , hardness, weight,____________ , density, ____________
2) Chemical = did it change-bubbles, ____________ , light formed, ______ changes
-doesn't always indicate change
Where is chemistry?Nails rustingMilk SouringPlants GrowingColors FadingBakingBleaching hairIce CubesChanging a cheeseburger into muscle, fat, and bone
Section1DefiningMatterkids.notebook
2
September 17, 2013
Lesson 3 - Defining Matter
Matter - all materials and objects in the world
-air? shadow? virus? heat? sound? -HAS:
1)____________ (kg)- Amount of material
2)____________ - amount of space something takes up
Weight vs MassWeight = ____________
- dependant upon make-up and ____________ - use a ____________
Mass = ____________ - only dependant upon what the substance is made of- use an electronic ____________
Measuring Volume-l x w x h- 1L = ____________ mL-1cm3 = ____________ -Meniscus - like the thing in your knee???
- NOPE! Curvature of the top of a liquid -read, at eye level, liquid ____________ point
PrecisionHow specific a measurement is
the _______ decimal places (sig figs) the more the precise___________ Does NOT have to be ___________ to be precise
AccurateGetting the correct answer
Section1DefiningMatterkids.notebook
3
September 17, 2013
Jose measures the mass of a substance 3 different times to be 2.1g, 2.12g, and 2.124g.
Which measurement is most precise?
How could this measurement be precise but not accurate?
How can I assure that a measurement is accurate?
Significant Figures1. All ____________ numbers are significant
613 = ___123456 = ___
2. Zeros located ______ nonzero digits are significant 5004 = ___602 = ___6000000000000002 =___
3. Trailing zeros (those at the end) are significant only if the number contains a decimal point; otherwisethey are insignificant
5.640 = ___120000. = ___120000 ___ (unless you’re given additional
information in the problem)4. Zeros to left of the first nonzero digit are insignificant ;
0.000456 = ___0.052 =___
1. Provide the number of sig figs in each of the following numbers:
(a) 0.0000055 g _____
(b) 1.6402 g _____
(c) 16402 g ______
(d) 3.40 x 103 mL ______
(e) 1.020 L _____
(f) 1020 L _______
ADDING AND SUBTRACTING w/Sig Figs
When adding and subtracting, the precision of the final answer can be no greater than the least precise measurement.no more decimal places then least decimal in problemmake sure to always line up decimals
becomes _______ cm
Section1DefiningMatterkids.notebook
4
September 17, 2013
MULTIPLYING AND DIVIDING w/Sig Figs
Your answer must be limited to the measurement with the least number of sig figs.
Example 1
Example 2
Example 3
Measuring with Significant Figures - Measure all certain numbers plus ___ extra position
-52.3 = 52 is ___________ and .3 is __________
4X ?? X is probably 7we are off 147 1
Section1DefiningMatterkids.notebook
5
September 17, 2013
Lesson 4 - Mass and Volume2 methods to measuring Volume
1) l x w x h2)Using ___________ _________ to Determine Volume
Procedure:1) Add a specific amount of water to a graduated cylinder and
record volume2) Add solid object that you are measuring3) read new volume4) New volume - old volume = Volume of solid object
Comparing Mass and Volume-Can have same volume but different mass
Section1DefiningMatterkids.notebook
6
September 17, 2013
Lesson 5 - DENSITY
d =
Density = ___________ ___________
D=___________
UNITS = ??? = ___________
-More matter = object is ___________ Density of substance does NOT change with its size!
Identifying Matter Using Density
___________ Property - depends on type of matter, not amount
Ex: Color, hardness, melting point, temperature, and density___________ Property = change depending on amount
Ex: mass and volume
EVERY SUBSTANCE HASA PARTICULAR DENSITY
-Thus you can ID substances by density
Section1DefiningMatterkids.notebook
7
September 17, 2013