Which of these reactions are redox reactions?

The commercial production of nitric acid involves the following chemical reactions: 

	4NH3 (g) + 5O2 (g) → 4NO(g) + 6H2O(g)
	2NO(g) + O2 (g) → 2NO2 (g)
	3NO2 (g) + H2O(l) → 2HNO3 (aq) + NO(g).

My students and I came across this and were stumped. Oxidation is always accompanied by reduction - so I was taught. These reactions appear to only have oxidation, where is the reduction? These steps are from the Ostwald process for producing HNO3 

1) 4NH3 + 5O2 ---> 4NO + 6H2O 
2) 2NO + O2 ---> 2 NO2 
3)3NO2 + H2O ---> 2HNO3 + NO 


step 1 shows oxidation of nitrogen from 3- to 2+ and reduction of oxygen from 0 to 2- 

step 2 shows oxidation of nitrogen from 2+ to 4+ and reduction of oxygen from 0 to 2- 

step 3 shows both oxidation and reduction of nitrogen, as you have indicated. 

ISU HDFS 276 QUIZ 2

1.
	The mortality rate is highest for which type of cancer in women?   Student Response Correct Answer A. ovarian     B. breast   C. vaginal   D. cervical   E. endometrial   Score: 1/1
2.
	What is the name for the small cylindrical organ containing erectile tissue whose sole function is to bring sexual pleasure?   Student Response Correct Answer A. labia majora    B. clitoris    C. cervix   D. vagina   E. perineum   Score: 1/1
3.
	TSS is a:   Student Response Correct Answer A. fungal disease.   B. bladder disorder.    C. bacterial disease.    D. form of yeast infection.   E. viral disease.   Score: 1/1
4.
	During menstruation, the layer of the uterus that is partially shed in response to hormonal fluctuations is the:   Student Response Correct Answer A. perineum.    B. endometrium.    C. parimetrium.   D. myometrium.   E. episometrium.   Score: 1/1
5.
	Which statement below regarding the uterus is FALSE?   Student Response Correct Answer A. It provides a path for sperm to reach the ovum.   B. It undergoes a cycle of change each month that leads to menstruation.   C. The uterine wall is made up of three layers.   D. It increases in size and weight during pregnancy.    E. It's a thin-walled organ composed of erectile tissue that engorges with blood.    Score: 1/1
6.
	If a woman has a hymen that is not intact, we can safely assume that   Student Response Correct Answer A. she has used tampons.   B. she has had it surgically removed.    C. she is not a virgin.   D. she has engaged in vigorous exercise that has ruptured her hymen.   E. none of these are true    Score: 1/1
7.
	The incision that may be made during childbirth to avoid tearing the perineum is called:   Student Response Correct Answer  A. an episiotomy    B. an avulsion   C. a clitorectomy   D. a hymenectomy   E. an infibulation   Score: 1/1
8.
	The primary function of the fimbriae is to:   Student Response Correct Answer A. direct the release of hormones.    B. direct the ova from the ovaries to the fallopian tubes.    C. implant the fertilized egg into the uterus.   D. provide arousal during sexual stimulation.   E. begin contractions necessary for childbirth.   Score: 1/1
9.
	The function of the mons veneris is primarily:   Student Response Correct Answer A. to release hormones in a cyclical pattern.    B. to protect the genitals during intercourse.    C. to facilitate conception.   D. to increase the production of pheromones.   E. to aid in the maturation of ova.   Score: 1/1
10.
	Sadaf has irregular menstruation, is overweight, has excessive body and facial hair, and acne. She may have:   Student Response Correct Answer  A. polycystic ovarian syndrome (PCOS).    B. uterine fibroids.   C. menorrhagia.   D. endometriosis.   E. toxic shock syndrome.   Score: 1/1
11.
	During a normal menstrual cycle, a woman's endometrium is maximally ready to receive a fertilized egg. Most likely, she is in which phase of the menstrual cycle?   Student Response Correct Answer A. menstrual   B. premenstrual    C. luteal    D. follicular   E. ovulation   Score: 1/1
12.
	Which of the following does not characterize the vagina?   Student Response Correct Answer A. the birth canal   B. the canal through which menstrual fluid flows    C. the primary female organ involved in sexual arousal    D. the passageway for arriving sperm   E. the primary female organ involved in intercourse   Score: 1/1