Accuracy and Precision
Having measurements that are close together but far from the target are
Precise but not accurate
_______ centimeters are in 1 meter.
100
The SI standard units for volume and mass are
liters and grams
The relationship between the mass m of a material, its volume V, and its density D
density= mass/volume
What is the equation for water displacement?
Vsubstance = Vfinal - Vinitial
Having measurements that are close together and close to the target.
Both precise and accurate
_____________ millimeters are in 1 meter.
1,000 millimeters
The symbols for units of length in order from smallest to base unit are
pm, nm, um, mm, cm, dm, m
The density of aluminum is 2.70 g/cm3. The volume of a solid piece of aluminum is 1.50 cm3.
What is 1.80 grams
An object is dropped into a graduated cylinder containing 10.0 mL of water. If the density of the object is 3.15 g/mL, and its mass equals 15.0 g, how high did the water rise to in the graduated cylinder (what is the water’s final volume) after the object was placed in the water?
14.76mL
The measurement that was recorded was 1.500g but the actual measurement should have been 1.513g. What is the precent error and is that accurate?
0.86%, and accurate
The quantity of matter per unit volume is
density
The symbols for units of mass in order from base unit to largest unit are
g, dag, Hg, Kg, Mg, Gg, Tg
The mass of a 5.00 cm3 sample of gold is 96.5 g.
Complete the calculation: 4.126g +100.28g
104.41g
Give an example of accurate and precise measurements if your target is 1.900g/mL
1.899, 1.900, 1.898, 1.899
The unit cm3 measures and equation for the derived unit.
volume = l *w* h
The two instruments used to measure the mass of an object.
digital scale and triple beam balance
The density of sugar is 1.59 g/cm3. The mass of a sample is 4.0 g.
2.5 cm3
Write in scientific notation 0.000320
3.20x10-4
Calculate the precent error of the following samples 5.23g/mL, 5.64g/mL, 4.94g/mL. The theoretical value is 5.250g/mL. Is it precise or accurate?
0.4%, 7.4%, 5.9% , overall not precise and not accurate.
If your graduated cylinder reads to the tenths place what should your answer be in?
hundredths place
What is an example of a derived unit
density (g/mL) or volume (cm3)
When density of a cube with 2.00cm side, and a mass of 54.35g
6.79g/cm3
If there is a leak in a kids pool of 2.00 cups per hour and dimensions are 2.0 dm by 11.430 dm by 11.430 dm. How many days until it is empty.
1 m3 = 1000 Liters, 2 cups = 1 pint, 2 pints = 1 quart, 946 mL = 1 quart
23 days