Laser_3

A monatomic ideal gas expands adiabatically from an initial volume of 72 L and a

A monatomic ideal gas expands adiabatically from an initial volume of 72 L and a

A monatomic ideal gas expands adiabatically from an initial volume of 72 L and an initial temperature of 350 K until its temperature falls to 290 K. What is the final volume of the gas?
A) 95 L
B) 98 L
C) 101 L
D) 104 L
E) 14

ppk   1722   N/A

ppk

2.50 moles of a monatomic ideal gas expand adiabatically from an initial tempera

2.50 moles of a monatomic ideal gas expand adiabatically from an initial tempera

2.50 moles of a monatomic ideal gas expand adiabatically from an initial temperature of 300 K and an initial volume of 80.0 L to a final volume of 150 L. What is the final temperature of the gas?
A) 840 K
B) 563 K
C) 426 K
D) 287

ppk   1447   N/A

ppk

A monatomic ideal gas at an initial temperature of 390 K is compressed adiabatic

A monatomic ideal gas at an initial temperature of 390 K is compressed adiabatic

A monatomic ideal gas at an initial temperature of 390 K is compressed adiabatically from an initial volume of 120 L to a final volume of 40.0 L. What is the final temperature of the gas?
A) 124 K
B) 811 K
C) 610 K
D) 775 K
E

ppk   1069   N/A

ppk

A certain engine extracts 1300 J of heat from a hot temperature reservoir and di

A certain engine extracts 1300 J of heat from a hot temperature reservoir and di

A certain engine extracts 1300 J of heat from a hot temperature reservoir and discharges 700 J of heat to a cold temperature reservoir. What is the efficiency of this engine?
A) 46%
B) 54%
C) 86%
D) 27%
E) 13%

ppk   1432   N/A

ppk

A reversible engine operating between 500 K and 300 K has the same efficiency as

A reversible engine operating between 500 K and 300 K has the same efficiency as

A reversible engine operating between 500 K and 300 K has the same efficiency as a reversible engine operating between 400 K and what lower temperature?
A) 200 K
B) 220 K
C) 240 K
D) 260 K
E) 280 K

ppk   1494   N/A

ppk

What is the maximum efficiency of an engine operating between 500 K and 300 K? A

What is the maximum efficiency of an engine operating between 500 K and 300 K? A

What is the maximum efficiency of an engine operating between 500 K and 300 K?
A) 20%
B) 30%
C) 40%
D) 50%
E) 60%

ppk   748   N/A

ppk

A certain Carnot engine has Th = Tc + 35K, and an efficiency of 20.0%. What is T

A certain Carnot engine has Th = Tc + 35K, and an efficiency of 20.0%. What is T

A certain Carnot engine has Th = Tc + 35K, and an efficiency of 20.0%. What is Th?
A) 70.0 K
B) 140 K
C) 175 K
D) 210 K
E) 245 K

ppk   1335   N/A

ppk

please help

please help

we know that 0.89% saline (NaCl) solution is isotonic with blood .In real-life emergency, you run out of physiological saline solution and have only KCL as a salt and distilled water . would it be acceptable  to make a 0.89% aqueous KCL solution

berfrye   751   N/A

berfrye

Specific heat, final temperature problem?

Specific heat, final temperature problem?

A piece of aluminum with a mass of 250. g is at an initial temperature of 5.0 °C. If 24.1 kJ is supplied to warm the Al, what is its final temperature?

the specific heat capacity of Al is 0.902J g^-1 ºC


what is did, is i s

nevada   2047   N/A

nevada

A 5.00-mL sample of a phosphoric acid solution of unknown concentration is titrated with a 0.1221 M

A 5.00-mL sample of a phosphoric acid solution of unknown concentration is titrated with a 0.1221 M

Part 1 of 1 -   27.0/ 50.0 Points
Question 1 of 12    4.0/ 4.0 Points
A 0.15 M solution of BaCl2 contains:

A. 0.30 M Ba2+ ions and 0.30 M Cl- ions.   

B. 0.30 M Ba2+ ions and 0.15 M Cl- ions.   
   

C. 0.15 M Ba2

tater218   8994   N/A

tater218

Name the following compound: CH3-CH2-CH2-CH2-O-CH2-CH3

Name the following compound: CH3-CH2-CH2-CH2-O-CH2-CH3

Part 1 of 1 -   25.0/ 50.0 Points
Question 1 of 12    4.0/ 4.0 Points
Name the following compound: CH3-CH2-CH2-CH2-O-CH2-CH3

A. hexyl ether   

B. 2-hexone   
   

C. butyl ethyl ether   

D. ethyl butylone

tater218   10231   N/A

tater218

Dilutions

Dilutions

You were working in a biomedical research lab. You needed to find 25 mL of 1.5x10-3 M aqueous solution of blue dye for your next experiment. After a thorough search, you found a bottle of 0.01M, stock solution of the blue dye. How do you dilute the s

sholland90   1187   N/A

sholland90

Chemistry for Today: General, Organic, and Biochemistry, 6th Edition Seager, Sla

Chemistry for Today: General, Organic, and Biochemistry, 6th Edition Seager, Sla

Hi does anyone have Chemistry for Today: General, Organic, and Biochemistry, 6th Edition
Seager, Slabaugh test bank questions? Please let me know ASAP

trisha101   2186   N/A

trisha101

Chem Lab Help

Chem Lab Help

From a manufactory’s production line, there are two types of soda products: Apple and Cherry flavors. Your job is to randomly select samples from the each product line and monitor the quality of the products from data you have measured. You have used

sholland90   1147   N/A

sholland90

Confident Interval

Confident Interval

From a manufactory’s production line, there are two types of soda products: Apple and Cherry flavors. Your job is to randomly select samples from the each product line and monitor the quality of the products from data you have measured. You have used

sholland90   747   N/A

sholland90

confident interval of the mean for the Cherry soda

confident interval of the mean for the Cherry soda

From a manufactory’s production line, there are two types of soda products: Apple and Cherry flavors. Your job is to randomly select samples from the each product line and monitor the quality of the products from data you have measured. You have used

sholland90   934   N/A

sholland90

confident interval of the initial production?

confident interval of the initial production?

From a manufactory’s production line, there are two types of soda products: Apple and Cherry flavors. Your job is to randomly select samples from the each product line and monitor the quality of the products from data you have measured. You have used

sholland90   779   N/A

sholland90

the mean of the initial test indeterminate or determinate error?

the mean of the initial test indeterminate or determinate error?

From a manufactory’s production line, there are two types of soda products: Apple and Cherry flavors. Your job is to randomly select samples from the each product line and monitor the quality of the products from data you have measured. You have used

sholland90   869   N/A

sholland90

Hexane boils at 156.2oF. What is this temperature in Celcius? What is this temperature in Kelvin?

Hexane boils at 156.2oF. What is this temperature in Celcius? What is this temperature in Kelvin?

Question 1 of 12
Which of the following is an example of an observation? 
 A. Reactions occur due to the transfer of electrons. 
 
 B. All matter is composed of small, indestructible particles called atoms

TOLBERTJD   10048   N/A

TOLBERTJD

Write the chemical formula for each of the following ionic compounds: Copper (II) Bromide, Silver (I

Write the chemical formula for each of the following ionic compounds: Copper (II) Bromide, Silver (I

Question 1 of 12
Identify the element that is a nonmetal, a gas, and has an elemental symbol that starts with the letter "A." 
 A. Al 
 
 B. Ac 
 
 C. Au 
 

TOLBERTJD   7072   N/A

TOLBERTJD

Burning up or burning down?

Burning up or burning down?

An experiment was carried out to determine the chemical formula of a metal oxide (MxOy) by burning the metal. The similar experiment but using Magnesium is described in the previous article: "Stoichiometric experiment explained". You can al

sholland90   1132   N/A

sholland90

Exam tomorrow!! Please help me solve this! I tried everything!!! (Acid/base pH calculation)?

Exam tomorrow!! Please help me solve this! I tried everything!!! (Acid/base pH calculation)?

Some hydrogen and iodone are mixed at 229 degrees C in a 1.00L container. When equilibrium is established, the following concentrations ar present:
[HI] = 0.490M
[H2] = 0.080M
[I2] = 0.060M

If an additional 0.300 moles of HI is then added, what con

soccer1912   776   N/A

soccer1912

predict the initial rate

predict the initial rate

predict the initial rate if [no]= 0.30 m and [h2]=0.15 m
what would happen to the initial rate of the reactonif[no]=0.60 m and [h2]=0.15 m instead. does your result make sense interms of order of reacton?

Post Merge: [time]134

thains32   4302   N/A

thains32

Bond Length Differences

Bond Length Differences

What causes the difference in bond lengths in butane and tertbutyl cyclohexane?

Does it have something to do with stability?

tackett6   2738   N/A

tackett6

chemistry question

chemistry question

(2.) How do soaps work? Describe their chemical properties and give an example (including chemical formula) of a particular soap.

Need ASAP thanks

bcretired   625   N/A

bcretired

solution for lab 5 SCN131

solution for lab 5 SCN131

Suppose you were required to make a solution by diluting 15.0 mL of an aqueous solution to a final volume of 500 mL.
(4 pts.) Describe, in as much detail as possible, the entire dilution process from beginning to end as described in this la

bcretired   1263   N/A

bcretired

Technetium-99m emits only gamma radiation? Why would this type of radiation be used in diagnostic imaging?

Technetium-99m emits only gamma radiation? Why would this type of radiation be used in diagnostic imaging?

rather than an isotope that also emits beta or alpha radiation?
Please help

bugmenot1   1687   N/A

bugmenot1

A sample of technetium-99m has an activity of 1.5 Ci.?

A sample of technetium-99m has an activity of 1.5 Ci.?

A sample of technetium-99m has an activity of 1.5 Ci. How many disintegrations occur in the technetium-99m sample in 5.0 sec?

smmoh4   2682   N/A

smmoh4

What is the total orbital energy of this satellite? Extra energy to put it into parabolic orbit?

What is the total orbital energy of this satellite? Extra energy to put it into parabolic orbit?

A communications satellite of mass 700 kg is placed in a circular orbit of radius 4.23 X 10^7m around the Earth.

A) What is the total orbital energy of this satellite?

B) How much extra enegry would we have to give this satellite to put it into par

liem921   457   N/A

liem921

Calculating pH with pKa at certain ionization point?

Calculating pH with pKa at certain ionization point?

1) Lactic Acid has one acidic hydrogen with pKa=3.85. At what pH is lactic acid 3/4 ionized?

2) Ammonia has a pKa of 9.24. At what pH is ammonia 70% ionized?

smmrwds   606   N/A

smmrwds

Calculating pH of a buffered solution?

Calculating pH of a buffered solution?

Can someone help me set up an ICE box for this problem?

Calculate the pH of a buffered 1-L solution that contains .010 mol HF and .010 mol KF. What would be the pH if the same volume did not include KF?

Mick   449   N/A

Mick

What is the composition of the vapor of a pentane-hexane solution that has a vapor pressure of 361 Torr at 25C?

What is the composition of the vapor of a pentane-hexane solution that has a vapor pressure of 361 Torr at 25C?

I got 0.584 = mole fraction of pentane in vapor and 0.416 mole fraction of hexane in vapor.

Somehow it's wrong please help =(

SMK.ANOOP   1496   N/A

SMK.ANOOP

Dissolution Rate Constant

Dissolution Rate Constant

2 grams of sugar (solubility = 4.20 g/mL water at 90°C) was added to a travel mug of coffee (500 mL) and half the sugar dissolved with stirring in 100 secs.
The sugar had a surface area of 6 x 10^(-3)m^2(approx 1mm^3 grains).
Calculate th

andzo   725   N/A

andzo

consider the following reaction

consider the following reaction

Again this board has been great in helping me prepare for assignments..would appreciate your help again

Consider the following reaction, and its value of K :
 2 HBr(g) + Cl2(g) ⇄ 2 HCl(g) + Br2(g)
K = 0.065
 a. Sketch the r

megared   684   N/A

megared

What did you observe when your solution of water and t-butyl alcahol was shaken with saturated potas

What did you observe when your solution of water and t-butyl alcahol was shaken with saturated potas

the salting out effect:
1)what did you observe when your solution of water and t-butyl alcahol was shaken with saturated potassium carbonate?

2)addition of pottasium carbonate _____ (decrease or increase) the solubility of t-butyl alc

gh1991   971   N/A

gh1991

Does anyone has any information on this forum, I have not had any luck!!!

Does anyone has any information on this forum, I have not had any luck!!!

In this discussion, you will be investigating the effects of acid rain in your location.

1. Identify your chosen area and include an image that shows an example of the effects of acid rain in your chosen area. If possible, find the example

Steptim   580   N/A

Steptim

have a couple questions can anyone answer them?

have a couple questions can anyone answer them?

   If the Constitution was written today, given what we now know about science and technology, particularly chemistry (and even more specifically biochemistry and molecular biology), what do you think it would include/not include, and why?
   How w

Cupcake16   481   N/A

Cupcake16

Titration Curve Problem for amino acid

Titration Curve Problem for amino acid

(20 points) Draw the titration curve for the titration of 25 mL of a 0.18 M solution of lysine (pka1 =
2.18, pKa2 = 8.95) with 0.15 M sodium hydroxide. Clearly label the axes of your graph in mL of
sodium hydroxide added. Be sure to include

gathwal   761   N/A

gathwal

how many moles?

how many moles?

I dont understand how to do any of these!! please help
if anyone can explain how to do it as well thatd be awesome!

kbertoldo7   438   N/A

kbertoldo7

Calculating the Potential of Solution, this makes me sick!!?

Calculating the Potential of Solution, this makes me sick!!?

You are titrating 50.00mL of solution containing 0.100mol/L Co2+ with 0.100 mol/L Ce4+ titrant at 25 degree celcius.
Eo Ce4+, Ce3+ = 1.44 V    ---------------------------    Eo Co3+, Co2+ = 0.855V

Calculate the potential of the solution after the ad

desiinuk   330   N/A

desiinuk