UNIT 1 - THE WORLD OF CHEMISTRY
EXAM 2026,QUESTION AND ANSWERS
Energy - answera measure of a systems ability to change or to create change
Kinetic Energy - answerenergy of motion
Potential Energy - answerstored energy due to position of the object
Matter - answermaterial that has mass and takes up space
Variable - answerA quantity that can be measured or changed
Controlled Variable - answera factor in an experiment that remains constant
Error - answerUnavoidable differences between real measurements and the unknown
true value of the quantity being measured
significant difference - answerin an experiment, a situation where the difference
between two results is much greater than the error in either result.
Mass - answerthe amount of matter in an object
Volume - answerThe amount of space an object takes up
Density - answerA measure of how much mass is contained in a given volume.
Accuracy - answerhow close a measurement is to the true value
Precision - answerhow close the measured values are to each other
Significant Figures - answerA way of writing data that indicated how precise a
measurement is.
Scientific Notation - answerA mathematical method of writing numbers using powers of
ten.
Conversion Factor - answera ratio of equivalent measurements used to convert a
quantity from one unit to another
Average - answera central value in a data set around which other values cluster
mean - answeran average value obtained from a set of measurements by adding up all
of the values and dividing by the total number of measurements
EXAM 2026,QUESTION AND ANSWERS
Energy - answera measure of a systems ability to change or to create change
Kinetic Energy - answerenergy of motion
Potential Energy - answerstored energy due to position of the object
Matter - answermaterial that has mass and takes up space
Variable - answerA quantity that can be measured or changed
Controlled Variable - answera factor in an experiment that remains constant
Error - answerUnavoidable differences between real measurements and the unknown
true value of the quantity being measured
significant difference - answerin an experiment, a situation where the difference
between two results is much greater than the error in either result.
Mass - answerthe amount of matter in an object
Volume - answerThe amount of space an object takes up
Density - answerA measure of how much mass is contained in a given volume.
Accuracy - answerhow close a measurement is to the true value
Precision - answerhow close the measured values are to each other
Significant Figures - answerA way of writing data that indicated how precise a
measurement is.
Scientific Notation - answerA mathematical method of writing numbers using powers of
ten.
Conversion Factor - answera ratio of equivalent measurements used to convert a
quantity from one unit to another
Average - answera central value in a data set around which other values cluster
mean - answeran average value obtained from a set of measurements by adding up all
of the values and dividing by the total number of measurements
