Chemistry - November 2006

chemistry

2006-11-14 05:21:21 · 5 answers · asked by Anonymous

2006-11-14 05:16:30 · 4 answers · asked by dreamer 1

2006-11-14 05:12:19 · 3 answers · asked by goring 6

2006-11-14 05:11:08 · 26 answers · asked by Anonymous

Metallic molybdenum can be produced from the mineral molybdenite, MoS2. The mineral is first oxidized in air to molybdenum trioxide and sulfur dioxide. Molybdenum trioxide is then reduced to metallic molybdenum using hydrogen gas. The balanced equations are given below.
MoS2(s) + 7/2 O2(g) MoO3(s) + 2 SO2(g)
MoO3(s) + 3 H2(g) Mo(s) + 3 H2O(s)

Calculate the volumes of air and hydrogen gas at 21°C and 1.00 atm that are necessary to produce 1.00 103 kg of pure molybdenum from MoS2. Assume air contains 21% oxygen by volume and assume 100% yield for each reaction
what is the volume in L of air and Hydrogen?
please explain

2006-11-14 05:10:06 · 1 answers · asked by smile 1

2006-11-14 05:00:51 · 4 answers · asked by tipper 1

I know that there is way to know or figure out the charges (2+, 3-, +) of the elements but what is it?

2006-11-14 04:44:53 · 3 answers · asked by daddysgurrl0505 1

2006-11-14 04:28:30 · 4 answers · asked by sam w 1

If the vapor's volume is assumed to be 125 mL instead of the measured volume, what is the percent error of the unknown's calculated molecular weight?

2006-11-14 04:20:42 · 1 answers · asked by HeTrP 1

If the outside of the flask is not dried after vaporizing the liquid, will the unknown's calculated molecular weight is too high ot too low? and explain why ?

2006-11-14 04:16:08 · 2 answers · asked by HeTrP 1

2006-11-14 04:12:59 · 4 answers · asked by Lindsay A 1

2006-11-14 04:09:46 · 2 answers · asked by Lindsay A 1

2006-11-14 04:07:33 · 2 answers · asked by Lindsay A 1

Which of the following is not associated with the neutralization reaction?

a. Litmus Paper
b. Vinegar
c. Ammonia
d. Copper

The Idea of balancing equations likely originated with...

a.Democritus
d. Dalton
c. Rutherford
d. Lavoisier

The Atomic Theory proposed by Dalton is not completely accurate according to what we know about matter today but his theory was valuable. What does this show us about science?

a. Useful ideas arise from scientific knowledge that can change.
b. Science is a body of unchanging information.
c. Scientific knowledge needs to be true to be useful.
d. Earlier ideas in scientific must remain as presented. They cannot be changed.

If Vinegar has a PH of about 3 and orange juice has a PH of about 4, then vinegar is.

a. Twice as strong an acid as orabge juice.
b. A weaker acid than orange juice
c. A weaker base than orange juice
d. 10 times stronger an acid than orange juice.

2006-11-14 03:48:43 · 6 answers · asked by artistmartista 1

2006-11-14 03:47:19 · 4 answers · asked by britt- britt 1

2006-11-14 03:47:08 · 4 answers · asked by blackbeauty_lilblack 1

2006-11-14 03:30:00 · 3 answers · asked by saurabh 1

how do you calculate the average atomic mass?

2006-11-14 03:28:28 · 4 answers · asked by yassem1ne 2

2006-11-14 03:09:34 · 5 answers · asked by Onecolegirl 2

where do i find informations about FDA standards (or any other country standards) regarding the amount of heavy metals in food...

>> preferably a website..

2006-11-14 03:04:40 · 2 answers · asked by LiNa-thrEe 1

If I have 1.0 M of HCL reacting with 1.0 M NaOH, and there is .02 L of HCL and .08 L of NaOH? How many mols of water form?

2006-11-14 03:00:38 · 2 answers · asked by Anonymous

these questions are so hard for me to answer. Please help me.

Indicate how the concentration of the unknown monoprotic acid would be affected by each of the following errors. Circle the correct choice and briefly explain your choice.

a) air bubble in the buret during the entire experiment
decrease increase no effect
b) air bubble initially in the buret that disappears by the end of the experiment
decrease increase no effect
c) pH meter calibrated to read higher value than actual
decrease increase no effect
d) water left in pipet subsequently used to dispense acid solution
decrease increase no effect


Thanx

2006-11-14 02:51:19 · 1 answers · asked by Anonymous

If a lot of people follow the same procedure for making a calorimeter and determing its heat capacity, would the heat capacity of it be (within experimental error) the same for everybody?

2006-11-14 02:30:02 · 1 answers · asked by hibiscus2424 1

2006-11-14 02:18:02 · 4 answers · asked by JAMES 4

2006-11-14 01:13:38 · 3 answers · asked by Caroline B 1

someone asked me how to clean the dollars which are black into original one

2006-11-14 01:02:37 · 5 answers · asked by arsik 1

2006-11-14 00:36:10 · 4 answers · asked by nutan_nutty 2

to know about this

2006-11-13 23:47:41 · 2 answers · asked by BUKNOY PANGIT 1

2006-11-13 23:37:37 · 17 answers · asked by madhu g 1

2006-11-13 23:35:21 · 3 answers · asked by Anonymous