The balmer-rydberg equation was derived from the observations of the spectral lines from the hydrogen emission spectrum. it relates the beginning and ending energy states of an electronic transition to the difference in energy between the two states.

δe = −2.179 ✕ 10^−18 j

leftparen1.gif
1
n
2
final
-

1
n
2
initial
rightparen1.gif
how much energy, in joules, is needed to excite an electron from the n=2 energy level to the n=5 energy level? report your response to three (3) significant figures.
in j
what wavelength of light, in meters, is needed to excite an electron from the n=2 energy level to the n=5 energy level? report your response to three (3) significant figures.
in m

Find the mass in grams of 1.37x1020 particles of h3po4

When a scientific theory has been tested and proved by the scientific community, it becomes a law

1. an experiment in your science class lists the materials needed for the lab. it is your job, as a lab partner, to measure out 25 ml of distilled water and 2.5 grams of magnesium. what lab measuring tools would you choose to measure each substance and how would you use each tool to get the correct amounts? be sure to describe the process you would follow step-by-step. (5 points) 2.which of the following is an si base unit for measuring mass? (2 points) ampere gram meter pound 3.which of the following is an si base unit for time? (2 points) decades hours minutes seconds 4.which of the following tools should a scientist use to measure an object in milligrams? (2 points) graduated cylinder pan balance tape measure thermometer 4.which of the following tools should a scientist use to measure an object in milligrams? (2 points) graduated cylinder pan balance tape measure thermometer. 5.a pencil beside a metric ruler. the ruler is scaled from 1 centimeter to 10 centimeters, with markings for millimeters between each number. one end of the pencil is beside the 0 on the ruler, and the pencil point is beside the 5. which of the following measurements is accurate but not precise? (2 points) 5 mm 5 cm 50 mm 50 cm 6. which of the following prefixes represents the largest value? (2 points) giga hector kilo milli 7. which of the following types of graphs is best for plotting the percentages of a whole value in a data set? (2 points) bar graph circle graph histogram line graph