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# chapter 2 study

What number is the metric system of measure based on? 10
What is the basic unit of length in the metric system? Meter
What should scientists rely on if they cannot obtain exact numbers? Estimation
Percent error (calculations) A way to determine how acurrate an experimental value is.
What way does a horizontal axis of a graph run? Left to right.
What graph has data points that do not fall along a straight line? Nonlinear graph.
A system is a what that works together to perform a function Group
How many sig figs are in the number 8.0025 5
What is a group of parts that work together? A system.
Median The middle number in a set of data.
Density is the measure of how much mass in a given what? Volume
What is the curve on the surface of water in a graduated cylinder? Meniscus
What is a common tool used to measure length. A meter stick.
What would your result be if you had a high percentage error? The result would be not acurrate.
Calculate to the correct number of sig figs in the problem 1.2 + 2.55? 2
True or false - To measure the mass a of a small insect, scientists would use a gram or kilogram False, milligram.
True or false - SI is a version of the metric system. True
True or false - A scientists would most likely use the Kelvin scale to measure daily temperature. False, Celcius.
True or false - When multiplyiing or dividing measurements, the answer has the same number of sig figs as the measurment with the most sig figs. False, fewest.
How many sig figs are in the number 0.00235 6
What is the point where the X axis and the Y axis cross called? origin
Why can’t you use a ruler to measure the volume of an irregular object such as a rock? How could you measure the volume of the rock you cannot measure the volume of the rock with a ruler because of its irregular shape. But you can put the rock in water and measure how much the water level rises (water displacement).
what is accuracy and precision? Acuracy refers to how close a measurement is to the true or accepted value. Precision refers to how cose a group of measurements are to each other.
What are the properties of a system, and what is an example of one? All systems have an input, process, output, and feedback. An example of a system would be a bicycle.
How do you measure the volume of a rectangular solid? Length*width*height.
Estimate An approximation of a number based on reasonable assumptions.
Mean The numerical average of a set of data.
Mode The first number that appears most often in a list of numbers
Range A set of data is the difference between the greatest value and the least value in a set.
Linear A line graph on which the data points yeild a straight line.
Anomalous data Data that do not fit in the rest of a data set.
How do you calculate density? Mass divided by volume.
What is the SI unit for temperature? Kelvin. But it can be degrees celcius.
How do you make a line graph? Identify the variables, determine the scale of the graph, number and label each axis, plot the data points, draw the graph, title the graph.
Created by: kwinkler