1. Observations/ Inferences
Regents Review
Prologue Topics
Observations/ Inferences
Measurements
Percent Deviation
Density
Rate of Change
Graphing

2. Observations-facts based on the 5 senses Inferences- educated guess based upon observations
Observation: The mountain has a U shaped valley.
Inference: It must have been carved by a glacier.
Inference: There are probably scratch marks on the bedrock

3. Measurements-a means of describing observations using numbers
Distance(meters) ESRT cover (ruler)
Volume(liters) length * width * Height or water displacement
Mass(grams) triple beam (balance)
Pressure(mb or Inches) ESRT pg 13 (barometer)
Temperature (F or C) ESRT pg 13 (thermometer)

4. Percent Deviation- how far your answer is from the actual answer.
Formula is on cover of ESRT
Ex. A student measures the mass of a rock to be 238.2g.
The actual mass of the rock is 237.5g. What is the
Students percent deviation?
% = actual-measured * 100
actual
% = g-237.5g * % = *100
237.5g g

5. Density-quantity of matter contained in a given space
Formula on cover of ESRT
Mass = 30 g
Vol=
Density= 6g/l
Mass = 10 g
Vol = 5 lt
Density =
Mass=
Vol= 15 ml
Density= 7 g/ml

6. Rate of Change: amt of time it takes for a change to occur
Formula on cover of ESRT
If we start with a 150g of salt in a shaker with water. After 8 Minutes the salt is weighed again and now has a mass of 73g. What is the rate of change for the salt?
Rate of =  in field value
time
Rate of  =  in mass
Rate of  = 150g-73g
8 min

7. Graph Relationships
Direct: on goes up
Other goes up
indirect: on goes up
Other goes down

8. Cyclic Graph: one that runs in a cycle
Increases than decreases