MuchCount

help me prove that (1 + Sinx + Cosx) / (1 + Sinx - Cosx) = Cot(X/2). Thanks.

If 80.0 mL of oxygen is collected over water at 20 degrees celcius and 95.0 kPa, what volume would the dry oxygen occupy at STP?

(the vapour pressure at 20 degrees celcius is 2.34 and the final answer is apparently 68.2 mL but i cant seem to get it... Please show your work)

If 80.0 mL of oxygen is collected over water at 20 degrees celcius and 95.0 kPa, what volume would the dry oxygen occupy at STP?

(the vapour pressure at 20 degrees celcius is 2.34 and the final answer is apparently 68.2 mL but i cant seem to get it... Please show your work)

i am in grade 10 and need a topic.i want to be creative and think of something good.

alright so i was thinking something about this stuff:

-the effects of abiotic factors on the growth of living things(humidity,fertilizers,salinity,pH,light,temperature,soil type,albedo,CO2,O2,nitrogen, etc..)

- the factors that affect the rate of common chemical reactions (temperature, concenctration, surface area, catalysts, etc..)

-the factors that affect decomposition

those are the ones im interested in so please help me think of a creative topic for my lab report..it has to be good and not to easy because the most of the mark depends on the topic i choose..

ok so my webcam works fine but when i try to add the the device on msn it shows the camera picture and its working ok but when i try to have a video conversation my webcam doesnt work its like i dont even have one. It says The Camera is currently in use or not plugged in, but its not in use and it is definately plugged in. How can i fix this and get my webcam to work on msn?

i formated my computer and now even though i install the hardware i cant get it to work..How can I on connect it and get it to work?

Ms. Mohammed wants to bleach her hair and she needs 1 500 ml of 36% hydrogen peroxide solution. The solutions available to her are 30% hydrogen peroxide solution and 40% hydrogen peroxide solution. How many millilitres of each solution should she use? plz show all your work and explain so i understand.

Chris is travelling by boat up the river and it took him 3h to cover 48 km against the current. It then took him 2h for the return trip with the current. What is the speed of the boat in still water and the speed of the current? [K//U 1 marks, App. 3 marks and Comm. 1 mark] plz show all your work and explain it so i understand.

Ms. Mohammed wants to bleach her hair and she needs 1 500 ml of 36% hydrogen peroxide solution. The solutions available to her are 30% hydrogen peroxide solution and 40% hydrogen peroxide solution. How many millilitres of each solution should she use? plz show all your work and explain so i understand.

Chris is travelling by boat up the river and it took him 3h to cover 48 km against the current. It then took him 2h for the return trip with the current. What is the speed of the boat in still water and the speed of the current? [K//U 1 marks, App. 3 marks and Comm. 1 mark] plz show all your work and explain it so i understand.

the problem is a virus im sure..how can i get rid of the virus cuz i just formated my computer this morning and it already has problems..

i have to take pictures for my Albanian passport but i don't know what sizes the pictures have to be. What size do the pictures have to be?

is it bad to leave an ipod mini charging all night (overcharging it). Would it be bad if it charged completly and it kept charging after?

is it bad to charge an ipod mini all night (overcharging it)?

i got an ipod mini 1st gen from my friend today. it was on dead battery and i have been charging it for 4 hours. It does not charge to 100% (around 80%). Should i leave it on overnight or it will never charge to 100%?

can it damage ur teeth?..is it something serious?

everytime i breath cold air, drink cold water, eat cold food, crunch my teeth together etc. my teeth hurt. The dentist said i have sensitive teeth but i dont think thats it. What is the problem and what should i do?

can it cause pimples on your face or body?

What did women who lived in the 1950's think of their own place in society? How many women were writing about their lives and experience? What did they say?