The Local Environment
Properties of the Environment
Density
The Nature of Change
EnvironmentalEquilibrium
100
An interaction of one or more of the senses with the environment or surroundings.
What is an observation?
100
L x W x H
What is the formula for Volume?
100
What is the density of a rock which has a mass of 35 grams and a volume of 7.0 cubic centimeters? 1. 5.0 g/cm3 2. 0.20 g/cm3 3. 28 g/cm3 4. 42 g/cm3
What is Density = mass/volume = 35 g/7.0 cm3 = 5 g/cm3
100
Provide the percent error/deviation formula and it's "units".
What is percent error or deviation = (|estimated value - actual value| / actual value) X 100
100
What is the formula to calculate for the rate of change?
What is change in field value/ change in time.
200
An interpretation of one or more observations.
What is an Inference?
200
A prediction of next winter's weather is an example of 1. an observation 2. an inference 3. a measurement 4. a classification
What is an inference.
200
An object has a density of 1.2g/cm3 and a mass of 5g. What is it's volume? Provide the formula for which you used to solve your answer.
What is volume = mass/density. v=5g/(1.2g/cm3)= 4.167cm3
200
What is meant by source of error? Give one example of a source of error.
What is any person, action, or condition that gets incorporated in an experiment and affects it's results. Examples: instrument imprecision, usage imprecision (not zeroing scales etc), unaccounted for outside influences (things like temperature changes), calculation errors, logic errors.
200
Which condition exists when the rates of water flowing into and out of a lake are balanced so that the lake's depth appears to be constant? 1. dynamic equilibrium 2. transpiration 3. equilibrium 4. saturation
What is dynamic equilibrium.
300
Grouping of of objects and events based on observable properties.
What is Classification?
300
A student placed a 20-cm plastic foam ball and a 5-cm piece of sandstone in a container of water. The sandstone sank and the ball floated. Propose a reason why the larger object floated and the smaller object sank.
What is density. The larger object is less dense than water so it sank. Even though the plastic foam ball has a greater volume, it does not have a great mass. The sandstone has a lot more mass, thus greater density and why it sank.
300
A student calculated the density of a substance. His teacher told him that his percent deviation is 4.35%. What does this percent error tell you about the actual value?
What is "the percent error tells you that the student's density value is 4.35% away from the actual value". Remember, you can used percent deviation for any measurement/calculation - density, mass, volume, length, rate of change etc.
300
Which event would be the most predictable one year in advance of the event? 1. a hurricane in Florida 2. an earthquake in California 3. a volcanic eruption in Japan 4. an eclipse of the Sun
What is an eclipse of the Sun.
400
An inference based on observations that indicate what will happen in the future.
What is a Prediction?
400
M / V
What is the Formula for Density?
400
Under the same conditions of temperature and pressure, three different samples of the same uniform substance will have the same 1. shape 2. density 3. mass 4. volume
What is density.
400
A student calculated the volume of a box to be 140cm3. The box has dimensions 10cm, 3cm, 5cm. What is the student's error?
What is 6.66%. |140-150|/150 x 100
400
The Earth process whose rate of change is easiest to measure is the 1. erosion of a mountain 2. discharge of a stream 3. formation of a rock 4. development of mature soil
What is discharge of a stream. The other possible answers take years to for the change to occur thus making an observation of the rate of it's change difficult. The discharge of a stream is the water that passes through a set location on the stream in a given amount of time - measured in cubic meters per second.
500
Improves ability to observe and to make measurements that would otherwise be very inaccurate or even impossible to make.
What is an Instrument?
500
(Difference between the measured value and the accepted value / accepted value) x 100%
What is the Formula for Percent Deviation?
500
As water cools from 4°C to O°C, its density 1. decreases 2. increases 3. remains the same
What is decreases. As a liquid, water has some unusual properties. As it cools from 100°C to 4°C its density increases as happens with other liquids. Between 4°C and O°C it actually expands. This means that the density decreases. For this reason, the maximum density of water occurs at 4°C, not O°C.
500
Walter gets a paper back in lab with "-2.75% error" written on it. He had found the mass of the object to be 100.7 grams. Can percent error be negative? What does this negative percent error mean?
What is " percent error can not be negative because of the absolute value in the formula. The negative percent error the teacher placed on Walter's paper tells you that the mass of the object as Walter calculated it is 2.75% below the actual value.
500
Which graph represents the greatest rate of temperature change and why?
What is graph (2), it is the steepest. Between the hours of 0 and 1, the temperature changed about 4 degrees Celsius/hour, more than that seen in any other graph.
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