What is Chemstry and Accuracy and Precision
The study of matter and how it changes
What is Chemistry?
Properties that stay the same (they do not change!) no matter the amount
What is Intensive?
The type of change where the substance remains the same
What is a physical change?
The amount of minutes in an hour AND the amount of seconds in an hour
What is 60? What is 3600?
The number that is a significant figure: 0 or 3
What is 3?
What is cooking, baking, cleaning, rusting, etc.
Properties that change (do not stay the same!) depending on the amount
What is Extensive?
The type of change where the substance(s) change into a new substance
What is chemical change?
The amount of meters in a kilometer AND the amount of milligrams in a gram
What is 1000? What is 1000 again?
The amount of Sig Figs in 3200
What is 2?
The volume of a box that is 3 cm long, 3 cm wide, and 3 cm high (Hint: Volume = length × width × height)
What is 27?
The difference between intensive and extensive properties
What is intensive properties always remain the same for a substance (ex. density, color, melting point) and extensive properties change depending on the amount (ex. weight, mass, volume)?
The type of change when liquid water turns into water vapor
What is physical change?
The solution to converting 150 milligrams (mg) to grams (g) using the conversion factor of:
1 gram = 1000 milligrams
(hint* do we multiply or divide? Don't forget your unit)
What is .250g?
The amount of Sig Figs in 620.0 & 0.060
What is 4? What is 2?
A student measures a temperature 3 times: 99 degrees, 99 degrees, 99 degrees. The actual temperature is 104 degrees. Were they accurate, precise or both?
What is precise?
Examples of extensive properties
What are Mass, volume, weight
The type of change when baking soda and hydrogen peroxide combine and bubbles appear (CO2)
What is chemical change?
The solution to converting 3.5 kilometers (km) to meters (m) using the conversion factor of:
1 kilometer = 1000 meters
(hint* do we multiply or divide? Don't forget your unit)
What is 3500m?
Scientific notation for 3600 (Hint: ____ x 10^____)
What is 3.6x10^3?
"How close a measurement is to the correct or accepted value" and "How close a series of measurements are to each other (reproducibility)"
What is Accurate? What is Precise?
Examples of intensive properties
What are Density, electrical conductivity, color, melting/boiling points
A law that states that during a chemical reaction, the total mass of the products must be equal to the total mass of the reactants (mass before and after a chemical reaction stays the same)
What is Conservation of Mass?
The solution to calculating percent error when a student measures the density of water at 1.10 g/mL and the accepted value of water is 1.00 g/mL with the formula of:
/experimental value-accepted value/
----------------------------------------- x 100
accepted value
What is .10 as a decimal and 10%? Is this good? (close enough to zero?)
Scientific notation for 0.0008
What is 8.0x10^-4?