Chapter 1 Flashcards
0
Q
History of chemistry
A
Early alchemists known as “chemists”
Early study of alchemy
Metals–> gold
1
Q
Chemistry
A
Scientific study of matter & How it changes
2
Q
Scientific Method
A
Ask questions about the natural world
- Ask a question
- Background research
- Hypothesis
- Experiment
- make observation or test hypothesis
- Gather data
- Conclusion
3
Q
Significant figure rules
A
- all Non-zero digits are significant (123456789)
- All zeros between non zeros are significant (2002)
- All beginning zeros are NOT sig (002)
- Ending zeros are only significant if decimal is present (20.870)
4
Q
Density
A
D= m/v
- comparing mass of object relative to size
- gas is less dense than liquids & solids
5
Q
Mass formula
A
M=DxV
6
Q
Volume formula
A
V=M/D
7
Q
Accuracy
A
How close the measured value is to the actual value
Quality effects it
8
Q
Precision
A
How close the values in a set of measurements are to each other
9
Q
Percent error
A
Accepted value - experimental value
_________________________________ x 100
Accepted value
10
Q
SI (system of measurement): length
A
Inch
Foot
Yard
Mile
11
Q
SI: volume
A
Cup
Teaspoon
Quart
Gallon
12
Q
Length base unit
A
Meter
13
Q
Mass base unit
A
Grams
14
Q
Temperature base unit
A
Celsius
