Chapter: Let's review
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In chemistry we use: metric system of measurement or decimal system of measurement?
Decimal system of measurement
What is the 7 SI (system international d’unité) base unit?
Mass————————–Kilogram—————–kg Length————————Meter———————m Time—————————Second——————-s Temperature ————–Kelvin———————K (capital letter) Amount of substance—-Mole———————mol Electric current————-Ampere—————–A (capital letter) Luminous intensity——–Candela—————-cd
What are the 3 temperatures scales?
Celsius Kelvin Fahrenheit
What is the • freezing point of pure water? • boiling point of pure water? • normal body temperature? in celcius
0=freezing point of pure water 100=boiling point of pure water 37=normal body temperature
What is the • freezing point of pure water? • boiling point of pure water? in Kelvin
273,15= freezing point 373,15= boiling point
What is the • freezing point of pure water? • boiling point of pure water? in Fahrenheit
32= freezing point of pure water 212= boiling point of pure water
How do we convert Celsius to Kelvin?
add (+)273,15 to Celsius temperature
How do we convert Kelvin to Celsius?
subtract (-)273,15 to Kelvin temperature
convert 1L to cm3
1000cm3
What is the precision?
the precision is how close the measured values are to each other
What is the accuracy?
The accuracy is how close a measured value is to the actual (true) value
how do we calculate the error in measurement?
experimental value - accepted value
How do we calculate the percent error in measurement?
(error in measurement)/(accepted value) x100
How do we calculate the percent relative error?
(accepted value-observed value)/(accepted value) x100
How do we calculate the standard deviation?
• calculate the average of the measurement • calculate the differences between measurements and the average • square the numbers found in step 2 • add the numbers found in step 3 • square root of the number found in step 4 divided by one less than the number of cases
True or False? Leading zeros do not count as significant figures
True
True or False ? Captive (imbedded) zeros do not count as significant figures
False
True or False ? trailing zeros are significant provided the number is written with a decimal point
True