.1 (1)
Name the type of chemical bond which forms between one hydrogen atom and
one nitrogen atom,
(2)
2
Define the term valence electrons.
(1)
3.
How many valence electrons does one nitrogen atom have?
4
For the ammonia molecule:
εεε εεε
(2)
6.4.1
Draw the Lewis structure of one ammonia molecule.
6.4.2 How many electron pairs surround the central atom?
6.4.3 How many atoms surround the central atom?
(1)
6.4.4 Give the term that is used to describe the molecular shape.
(1)
Ammonia readily dissolves in water (H20) to form ammonium ions (NH4").
6.5.1 Name the type of bond that forms between one ammonia molecule and
one hydrogen ion.
(1)
6.5.2 Draw the Lewis structure of one ammonium ion.
(2)
[12]​

Alivestock company reports that the mean weight of a group of young steers is 1100 pounds with a standard deviation of 93 pounds. based on the model n(1100,93) for the weights of steers, what percent of steers weigh a) over 1050 pounds? b) under 1300 pounds? c) between 1150 and 1250 pounds?

Astudent is performing an experiment comparing sound and light waves. the student gathers the following data. what conclusion does the student most likely make based on this data? light waves always travel the same speed; however, the speed of sound is determined by the medium that it travels through. all sound waves always have the same energy, so the temperature of the medium does not affect wave speed. light needs to vibrate particles, so it travels fastest in tightly packed solids, while sound does not need a medium, so it travels fastest in a gas. tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?