Wednesday

August 31, 2016
Total # Posts: 1,805

**Chemistry**

If at a certain instant during the course of the reaction 2 NO2(g) + F2(g) ¨ 2 NO2F(g), the rate of formation of the product were 0.16 mol/L∙s, how fast would the F2 be disappearing (also in mol/L∙s) at that same instant in time? A) 0.16 mol/L∙s B) ...
*July 30, 2012*

**Chemistry**

If the rate of formation of ammonia is 0.345 M/s, what is the rate of disappearance of N2? 1/2N2(g)+3/2H2(g)-->NH3(g) a. 0.173 M/s b. 0.345 M/s c. 0.690 M/s d. 245 M/s e. 0.518 M/s
*July 30, 2012*

**Chemistry**

Given the following data, determine the rate constant of the reaction 2NO(g) + Cl2(g) 2NOCl(g) Experiment [NO] (M) [Cl2] (M) Rate (M/s) 1 0.0300 0.0100 3.4 x 10–4 2 0.0150 0.0100 8.5 x 10–5 3 0.0150 0.0400 3.4 x 10–4 a. 1.13 M –2s–1 b. 9.44 M –2s...
*July 30, 2012*

**Chemistry**

Heat transfer from the system to the surroundings has a large effect on äSsurr ___________. a. when the temperature of the surroundings is low. b. when the temperature of the surroundings is high. c. when the temperature of the system is low. d. when the temperature of ...
*July 30, 2012*

**Chemistry**

What is the entropy change to the surroundings when 1 mol of ice melts in someone’s hand if the hand temperature is 32°C? Assume a final temperature for the water of 0°C. The heat of fusion of ice is 6.01 kJ/mol. a. –188 J/K d. b. –22.0 J/K c. –19.7...
*July 30, 2012*

**Chemistry**

If 1 mol of ice melts at its melting point of 273 K, the entropy change for the ice is 22.0 J/K. If the ice melts in someone’s hand at 34°C, what is the change in the entropy of the universe? Assume a final temperature for the water of 0°C. The enthalpy of fusion ...
*July 30, 2012*

**Chemistry**

Indicate which of the following has the highest entropy at 298 K. 0.5 g of HCN 1 mol of HCN 2 kg of HCN 2 mol of HCN All of the above have the same entropy at 298 K.
*July 30, 2012*

**Chemistry**

The standard molar entropy of lead(II) bromide (PbBr2) is 161 J/mol • K. What is the entropy of 2.45 g of PbBr2? a. +1.07 J/K b. –1.07 J/K c. +161 J/K d. –161 J/K e. 0 J/K
*July 30, 2012*

**Chemistry**

Calculate DeltaS0 for the formation of 1 mol of HI(g) from its elements given the following information: S0[H2(g)] = 131 J/mol∙K S0[I2(s)] = 116 J/mol∙K S0[HI(g)] = 206 J/mol∙K. A) 82 J/K B) 165 J/K C) 247 J/K D) 329 J/K
*July 30, 2012*

**Chemistry**

For which reaction is delta Ssys > 0? A) CH4(g) + 2 O2(g) ¨ CO2(g) + 2 H2O(l) B) NH3(g) + HCl(g) ¨ NH4Cl(s) C) 2 NH4NO3(s) ¨ 2 N2(g) + O2(g) + 4 H2O(g) D) HCl(aq) + NaOH(aq) ¨ NaCl(aq) + H2O(l)
*July 30, 2012*

**math**

Use a table of trigonometric values to find the angle è in the right triangle in the following problem. Round to the nearest degree, if necessary. cos è = 0.8192 A = 45 H =?
*July 18, 2012*

**math**

jai can you help me with my one right below taylor i think i got the answer
*July 17, 2012*

**math**

-8 1/8=6 1/2p is the answer 52.8 does p =52.8
*July 17, 2012*

**math**

is k 1971.9 if not can you please help me
*July 17, 2012*

**math**

6 9/16k=31 13/32 i dont know the answer to this one really its hard
*July 17, 2012*

**math**

and can you check my bottom question i answered
*July 17, 2012*

**math**

i got -9.31
*July 17, 2012*

**math**

arjun whnts to buy a telescope that costs 330.69 how much change does he receive if he gives the cashier 340
*July 17, 2012*

**math**

i got -2.73
*July 17, 2012*

**math**

nicole wants to buy a sled for 37.27 she gives the cashier $40 how much cahnge does she recieve
*July 17, 2012*

**math**

what is 270% of 2 inches
*July 17, 2012*

**math**

-3 1/2=7/4a
*July 17, 2012*

**math**

-9 1/4=-2x with steps please
*July 17, 2012*

**math**

ok thanks
*July 17, 2012*

**math**

i got $-4
*July 17, 2012*

**math**

heather had $23 to spend on three raffle tickets. after buying them she had 11. how much did each raffle ticket cost
*July 17, 2012*

**math**

thats what i had
*July 17, 2012*

**math**

a recipe for bread call for 5 1/6 cups of flour. matt accidentally put in 5 5/6 cups. how many extra cups did he put in?
*July 17, 2012*

**math**

how old am i if 400 reduced by 2 times my age is 236
*July 17, 2012*

**math**

7-2n+4n=n+3 an can you please provide steps
*July 15, 2012*

**math**

Please show the ratio answer as #:#. The length of a pool is twice its width. What is the ratio of the length to the width of the pool?
*July 5, 2012*

**english**

we need two helping verbs Ms. Sue
*June 25, 2012*

**english **

we ________ _____________ started our trip earlier in the morning. fill it in with a helping verb
*June 25, 2012*

**Physics :)**

A block of iron at 39.0°C has mass 2.30 kg. If 3.50×104 J of heat are transferred to the block, what is its resulting temperature? The specific heat of iron is 449 (J/kg*K) Someone else had this question on here but I cannot get the right answer from the explanation ...
*June 20, 2012*

**reading**

in"Stolen Days" what does this story say about the motivations for people's behavior?
*June 20, 2012*

**reading**

in "after twenty years" how much has jimmy changed over the years
*June 19, 2012*

**reading**

in "After Twenty Years" how are jimmy and bob similar and different
*June 19, 2012*

**math**

oh wait is it 588.23
*June 18, 2012*

**math**

is it 83
*June 18, 2012*

**math**

i have one last question hannah sold some girl scout chips and recieved a 17% commission. if she makes about $100 about how much did she have in sales? is it $83.00
*June 18, 2012*

**math**

thanks
*June 18, 2012*

**math**

john bought a new mac laptop for 520.99 with 15% sales tax. what was the original price and tax?
*June 18, 2012*

**math**

so when you do 6 of 20 would it be 333.3% or 30.0%
*June 17, 2012*

**math**

what percent of 67 is 33? round to the nearest tenth of a percent. the answer is 49.3% but i dont know how he got that can you explain
*June 17, 2012*

**math**

kk thanks
*June 17, 2012*

**math**

at the school store 6 pencils sell for $.99. at this rate what is the cost of 16 pencils?
*June 17, 2012*

**Geometry**

In a right triangle, sin θ = 9/15. Find the value of tan θ
*June 13, 2012*

**English 2**

thanks
*June 11, 2012*

**English 2**

Give two possible expository writing purposes. TOPIC: An historical figure Purpose #1 Purpose #2
*June 11, 2012*

**math**

-4 to the 6 power divided by -4 to the 3power
*May 30, 2012*

**probablitiy**

i did i responded
*May 29, 2012*

**probablitiy**

to th nearest tenth of a percent of 11/68 may i have a fraction,decimal, and percent
*May 29, 2012*

**math**

but my calulator is messed up may you please help me
*May 29, 2012*

**math**

probablity to the nearest tenth of a percent 11/68 to a decimal and percent
*May 29, 2012*

**math**

a drawer contains 2 red socks, 5 white socks, and 6 blue socks. without looking, you select a sock at random, replace it, and selecct a second sock at random. what is the probability that hte first sock is blue and the second sock is red?
*May 24, 2012*

**math**

The ratio of dogs to cats in a park is 4 to 5. If there are 63 dogs and cats in the park altogether then how many dogs are there?
*May 22, 2012*

**pre-algebra**

a tree is 5 ft. tall and has a shadow of 12 ft. if you are 5 ft. tall, what is the length of your shadow
*May 21, 2012*

**pre-algebra**

a tree is 5 ft. tall and has a shadow of 12 ft. if you are 5 ft. tall, what is the length of your shadow
*May 21, 2012*

**Math**

the area of the shaded part. 4cm is the height 8cm is the base and 6cm is the top of the square. then 6cm is the base of the second figure a trapezoid
*May 21, 2012*

**math**

Which describes independent events? a. you grab two jelly beans from a jar at the same time b. you draw a card from a deck, replace it, and draw a second c. you draw a card and do not replace it. Then yo draw another d. you study english every night and then you get an A on ...
*May 21, 2012*

**Honors Chemistry**

How many moles are in 4.36 L of oxygen gas at STP?
*May 21, 2012*

**math**

A pastry chef has 13 pounds of apple slices to make 8 apple pies. if the chef distributes the slices equally, what will be the weight of the apple slices used to make each pie?
*May 17, 2012*

**trig**

would that be 88 degrees, 45 degrees, 135 degrees, or 92 degrees?
*May 17, 2012*

**trig**

find the angle between vectors U= <2,3> and V= <1, -5>
*May 17, 2012*

**trig**

a vector has a magnitude of 16 and direction of 120 degrees. write the vector in terms of unit vecotrs i and j.
*May 17, 2012*

**trig**

what is the magnitude and direction of the vector U= -2i - 3j
*May 17, 2012*

**trig**

what is the single term of csc^2 theta-1 over csc^2 theta
*May 16, 2012*

**trig**

what is the angle of A? C = 125 degrees, a = 18, and c = 42
*May 16, 2012*

**trig**

find the supplimentary angle of pie over 8
*May 16, 2012*

**trig**

find the exact radian of 84 degrees
*May 16, 2012*

**trig**

Find the amplitude of f(t)=1/3sin8t
*May 16, 2012*

**irregular figures**

it is an irregular figures like a trapezpoid and triangles
*May 16, 2012*

**irregular figures**

if the base is 9 1/2in and the line in the middle is 3 1/2in. what is the area follow formula
*May 16, 2012*

**math irregular figures**

if the base is 46km and the other base is 26km and the height is 17km and the the little line in the middle say 11m wha tis the area
*May 16, 2012*

**reading**

in the story The Dying Decetive " how do watson's feeling about Holmes cahng during the play?
*May 15, 2012*

**math**

hello
*May 15, 2012*

**math**

is it 31777777 repeatimg i dont know
*May 15, 2012*

**math**

two cities are 1,900miles apart. a map uses a scale of 3cm=500 miles. how many centimeters apart are the two cities on the map?
*May 15, 2012*

**math**

so is it x=225in
*May 15, 2012*

**math**

a model of a house is drawn using a scale of 3in=15ft. what is the length of the actual house if the model has a length of 15in
*May 15, 2012*

**math**

um well 9% of 24 and 80% i think i dont know
*May 8, 2012*

**math**

do a% of b and b% fo a represent the same amount? Justify your answer
*May 8, 2012*

**math**

250% of t is 50. What is t?
*May 8, 2012*

**math**

thanks
*May 8, 2012*

**math**

18% of ________ is 14.4?
*May 8, 2012*

**math**

what is 4/21=x/168
*May 3, 2012*

**math**

proportions 4/21=x/168
*May 3, 2012*

**math**

marty has saved 72 dollars he spent 8 dollars write a ratio as a fraction in simplest form to represent what portion of his saving he has f\left
*May 3, 2012*

**math**

marty has saved $72. He spent $8 on a video rental. write a ratio as a fraction in simplest form to srpresent what portion of his savings he has left
*May 3, 2012*

**math**

thanks
*May 1, 2012*

**math**

how are triangles and trapziods alike
*May 1, 2012*

**math**

how is a triangle and a trapezoid alike
*May 1, 2012*

**math**

how are a trapezoid and a traingle alike
*May 1, 2012*

**Science**

i know you morgan fisher
*May 1, 2012*

**math**

no. the -4 goes with the entire problem. That's how the problem is written on my paper on two lines
*April 30, 2012*

**math**

evaluate (2 ^-4 - 3) the -4 goes with the whole problem
*April 30, 2012*

**Statistics**

The driver of a truck loaded with 900 boxes of books will be fined if the total weight of the boxes exceeds 36450 pound. If the distribution of the weight of a box has a mean of 40 pounds and a variance of 36, find the approximate probability that the driver will be fined.
*April 30, 2012*

**world geography**

ok, thank you for the references. And do you know if this sentence is an example of an economic challenge: The government owns everything, collectives and state farms are trying to operate.
*April 25, 2012*

**world geography**

what does a social challenge mean? I'm trying to find the social challenges of Kazakhstan.
*April 25, 2012*