Monday, February 27, 2012

Which of these reactions are redox reactions?

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




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. 

Friday, February 24, 2012

ISU HDFS 276 QUIZ 2

1.


 
The mortality rate is highest for which type of cancer in women?

 Student ResponseCorrect Answer
Student Response ovarianStudent Response  
 breast 
vaginal 
cervical 
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 ResponseCorrect Answer
labia majora 
Student Response clitorisStudent Response  
cervix 
vagina 
perineum 
Score:1/1
 

3.


 
TSS is a:

 Student ResponseCorrect Answer
fungal disease. 
bladder disorder. 
Student Response bacterial disease.Student Response  
form of yeast infection. 
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 ResponseCorrect Answer
perineum. 
Student Response endometrium.Student Response  
parimetrium. 
myometrium. 
episometrium. 
Score:1/1
 

5.


 
Which statement below regarding the uterus is FALSE?

 Student ResponseCorrect Answer
It provides a path for sperm to reach the ovum. 
It undergoes a cycle of change each month that leads to menstruation. 
The uterine wall is made up of three layers. 
It increases in size and weight during pregnancy. 
Student Response It's a thin-walled organ composed of erectile tissue that engorges with blood.Student Response  
Score:1/1
 

6.


 
If a woman has a hymen that is not intact, we can safely assume that

 Student ResponseCorrect Answer
she has used tampons. 
she has had it surgically removed. 
 she is not a virgin. 
she has engaged in vigorous exercise that has ruptured her hymen. 
Student Response none of these are trueStudent Response  
Score:1/1
 

7.


 
The incision that may be made during childbirth to avoid tearing the perineum is called:

 Student ResponseCorrect Answer
Student Response an episiotomyStudent Response  
an avulsion 
a clitorectomy 
a hymenectomy 
an infibulation 
Score:1/1
 

8.


 
The primary function of the fimbriae is to:

 Student ResponseCorrect Answer
direct the release of hormones. 
Student Response direct the ova from the ovaries to the fallopian tubes.Student Response  
implant the fertilized egg into the uterus. 
provide arousal during sexual stimulation. 
begin contractions necessary for childbirth. 
Score:1/1
 

9.


 
The function of the mons veneris is primarily:

 Student ResponseCorrect Answer
to release hormones in a cyclical pattern. 
Student Response to protect the genitals during intercourse.Student Response  
to facilitate conception. 
to increase the production of pheromones. 
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 ResponseCorrect Answer
Student Response polycystic ovarian syndrome (PCOS).Student Response  
uterine fibroids. 
menorrhagia. 
endometriosis. 
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 ResponseCorrect Answer
menstrual 
premenstrual 
Student Response lutealStudent Response  
follicular 
ovulation 
Score:1/1
 

12.


 
Which of the following does not characterize the vagina?

 Student ResponseCorrect Answer
the birth canal 
the canal through which menstrual fluid flows 
Student Response the primary female organ involved in sexual arousalStudent Response  
the passageway for arriving sperm 
the primary female organ involved in intercourse 
Score:1/1