# Posts by Chris

Total # Posts: 2,710

chemistry
If you place 10.0 L of propanol (C3H8O) in a sealed room that is 3 m long, 2.75 m wide, and 2.5 m high, will all the propanol evaporate? If some liquid remains, how much will there be? The vapor pressure of propanol is 10.7 torr at 25 °C, and the density of the liquid at ...

Math
What is the riddle for moving words

Chemistry
I must be going wrong somewhere. 1.3x.250 = .325 Mols KOH .325 Mols KOH = .325 Mols HBr Then I'm taking 350ml (.350) and multiplying it by .325 Mols HBr and I get .11375... That doesn't seem quite right. I really do appreciate your help. I never took chemistry in high ...

Chemistry
Let’s assume you have 250 ml of a 1.3M KOH solution and you want to neutralize it with the acid HBr. It takes 350 ml of the HBr solution to do so. What must have been the molarity of the HBr solution? HBr(aq) + KOH(aq) => KBr(aq) + H2O(l) The stoichiometry is already ...

Chemistry
Ok, thank you!

Chemistry
For an H+ concentration, [H+], of 4.3 x 10-4 M, would this be acidic, neutral or basic? Why? I'm assuming that because it is an H+ it would be acidic and H+ means acidic and OH- means base. Is this correct? And is there a better formula for this equation?

Chemistry
To make 250 ml of a 5%(w/v) calcium carbonate solution, how many grams of calcium carbonate will I need?

physics
we did a lab and my observation chart is like this when my mass is 1.4 kgs (height is 0.12m,distance is 1.0m,time is 0.87s,velocity is 1.1 m/s ,Eg is 1.6 and the Ek is 0.85) when my mass is 2.14 kgs(height is 0.12m,distance is 1.0m,time is 0.88s,velocity is 1.1 m/s ,Eg is 2.8 ...

Maths
I have 40 questions, 4 marks given for a correct answer, 2 marks deducted for each wrong answer and 1 mark deducted for for each answer not attempted I attempt 19 and score 25 marks.how many questions did I get right

algebra
student takes out two loans 1 at 10% and the other at 12 percent interest the 10 percent loan is \$2000 more then the 12% loan and the total interest for one year is \$430 how much is each loan?

Science
True/false Earth's atmosphere oceans and continents began to form during the first several hundred million years of the Precambrian time.

Chemistry
Dr. Bob, I am unable to see the answer you have provided? I'm not sure why, but I see "Bob Pursley answered your first post. It's below." The problem is, the is no post below.

Chemistry
I missed a few days of school due to a sick child. I'm reviewing for an exam and the following questions are giving me trouble as I wasn't there when they were reviewed in class. If possible, I need the answer and step-by-step process so I can see what what to do and ...

Chemistry
Thank you so much. This is sure to be very helpful!

Chemistry
Ah, this is what it means "below". In the second question I posted (above I guess) I rephrased my question for answer and all work. I'm really confused as to what your provided answer means as I missed these classes. I honestly have no idea what to make of the ...

Chemistry
I missed a few days of school due to a sick child. I'm reviewing for an exam and the following questions are giving me trouble as I wasn't there when they were reviewed in class. If possible, I need the step-by-step process. Thanks. 1.) If you put hydrogen peroxide on ...

How to express 12/15 as a fraction, percent, and decimal. Someone please show me how to solve.

The poster shows 12/15 games won so far. I need help on how to express as a fraction, percent, and as a decimal.

The poster shows how many of its games the football team has won so far. Express this information as a fraction, a percent, and as a decimal. Can someone show me how to solve this problem?

physics
A 4.5 kg block is dropped onto a spring of spring constant 1861 N/m from a height of 1500 cm find the speed of the block when the compression of the spring is 12 cm. The acceleration of gravity is 9.81 m/s

History
What is the national monument of America?

Physics-coefficient of friction
What's the minimum coefficient of friction between the ladder (of length d) and the ground will keep it from slipping? (consider the wall frictionless) (θ=56.5 degrees) I think the formula is supposed to be mg L/2 sin y, but it does not provide a length, nor a mass. ...

Physics- tension
An 63 kg construction worker is sitting 2.0 m from the end of a 1435 kg steel beam to think about the state of the world. Find the tension in the cable that is supporting the beam. Am I required to use the formula T1=sin(theta)*m*g? I am not sure if the problem is similar to a...

Physics- spring constant
Astronauts are in space so there is no gravity, but they wish to weight themselves. The spring constant is 265 N/m. The question shows a graph; the y is the position in meters while the x is the seconds. I do not wish for an answer, but the way in which i'm supposed to ...

Math
A sea turtle laid 95eggs,each weighing 1 ounce.what is the total amount of weight in pound?

Science
heated 100 grams of powdered mercuric oxide to produce 93 grams of liquid mercury, how much oxygen would be released?

English
What is a metaphor for improvement?

Math
3.85

Physics
A. You drag a suitcase of mass 19 kg with a force of F at an angle 41.3 degrees with respect to the horizontal along a surface with kinetic coefficient of friction 0.54. The acceleration due to gravity is 9.8 m/s^2. What is the normal force on the suitcase? Answer in units of ...

physics-distance
Here's a stationary bike. If you pedal such that the front wheel rotates at 6.9 rad/s, and that wheel's radius is half a meter, how far would you have gone in 35 minutes, if the bike where a non-stationary bike? (Assume a constant speed of rotation) I am not sure where...

science
Using the systematic method and information in the Appendices F and J (note that log value is given in Appendix J), determine [SCN-], [Hg2+], and [HgSCN+] at equilibrium when Hg(SCN)2(s) is dissolved in water.

chemistry
Propose methods for protecting the sodium hydroxide solution in the bottle and the buret from exposure to carbon dioxide in the air.

Math
A woman has money in two accounts. One account pays 7% annual interest, whereas the other pays 15% annual interest. If she has \$1,500 more invested at 15% than she does at 7% and her total interest for a year is \$1,545, how much does she have in each account? Please show the ...

physics
A skier leaves the starting gate at the top of a ski ramp with an initial speed of 4.00 m/s (Figure 6-41). The starting position is 120 m higher than the end of the ramp, which is 3.00 m above the snow. Find the final speed of the skier if he lands 145 m down the 20.0° ...

english
the air was thick and grey what else???

english
how can i describe polluted air using imagery

grammar
thanks

grammar
oops sorry that was a typo, it's supposed to be filled. "his eyes swollen and were filled with tears" OR his eyes suddenly got swollen and were filled with tears"

grammar
Does this sentence make sense? "His eyes swollen and were felled with tears."

Chemistry
Thanks

Chemistry
A sample of methane (CH4) gas contains a small amount of helium. Calculate the volume percentage of helium if the density of the sample is 0.70902 g/L t 273K and 1.00 atm. I know that the sample is at STP and that the 1 mole of gas under these conditions occupies 22.4L, but ...

chemistry
Just treat the 82.2 kJ as a product of the reaction and use stoichiometry to found out how many moles of methane were used like so... 82.2kJ x 2mol CH4/252.8 kJ = ? Then just multiply by the molar mass of methane (about 16.042g) to find how many grams of methane gas are ...

la
thats why were here in the first place boi

math
THERE IS NU ANSWER OK GEEZ MATH FRICKEN CHICKEN SUCKS

soc 120
Making abortion illegal is the result of continual undermining of women’s rights

Physics
A 10 kg box is held 2 meters up a ramp that is inclined at 35 degrees. It is released frpm rest, slides down the ramp and across the floor. the coefficient of friction is 0.15. How far along the floor will the box slide?

Social Studies
thanks Ms. Sue

Social Studies
which of the following best describes the purpose of the U.S constitution? A. It restricts rights of citizens. B. it outlines how the government should make laws. C. it establishes a national bank. D. it outlines basic rights for the people of all nations of the world. B

math
20+10+9+7=46 20/46 = .43478261 .43478261x100 = 43.5% 43.5% are ninth graders

chemistry
1. A sample weighing 1.30 mg was analyzed to determine the concentration of a certain compound (FW =292.16 g/mol) using UV/Visible spectrometry. First, the sample was dissolved in 5.00 mL volumetric flask. A 1.00 mL aliquot was drawn up, placed in a 10.0 mL volumetric flask ...

Analog Electronics
A 50mV signal is applied to the base of a properly biased transistor with r'e=10ohms and RC=560ohms. Determine the signal voltage at the collector. In my text book for this section there are formulas Vb=Ier'e Vc=IcRC Vc=IeRC Do I take 50mV/560ohms to get Ic then take ...

Western civilization
What development marked the start of the Archaic Age in Greece?

eng
the chances of something that is going to happen to u is really small ex:death

eng
name something so small that you won't expect it to happen ex: death

ap chemistry
.25L

math,algebra
(3^-1X^3)^2 x 12X^5 my work: 3/2X^6 x 12X^5= 36/2=18X^11 but the answer was 4/3X^11

Math
For N balls, m are black and the rest white,what is the probability that in the first n balls from N, 1 of them are black. Here m< N.

math
5.4%

social studies check
Hernado de Soto's mission accomplishes its original objectives. True or False? I think true but I'm not sure

social studies check
Ok Thanks

social studies check
Which of the following most contributed to the decline of Native American culture following the arrival of the Europeans? A. warfare B. enslavement C. relocation D. disease I think D?

social studies check

social studies check
In which period of Native American history did permanent settlements develop for the first time? A. Paelo-Indian B. Archaic C. Woodland D. Mississipian Is the answer B?

social studies check
1. Which of the following is NOT a reason that Oglethorpe and the trustees wanted to start the colony of Georgia? A. to help the poor who could not pay their bills B. to help the englich economy C. to form large plantations D. to provide defense I think B?

Social Studies
srry A

Social Studies
Politics most informs a person's actions in? A.civic life B. work life C. private life D. school life

Social Studies
Pete's peanuts wants to grow its overall prouctivity.which investment would best help the company achieve this goal? A. a larger building to store its peanuts. B. better advertiements for its products. C. new uniforms for company employees. D. an improved roasting and ...

Social Studies
which of these actions would most help a worker improve her productivity? A. finding a new job in a different field. B. taking a training course related to her job. C. buying a laptop computer for home use D. asking her employer to give her a raise i think D

Social Studies
which of these people is an example of an entrepneur? A. Malia started selling jewelry she made in an online store. B. Liam found a summer job walking dogs in his neightborhood. C. Pavel worked hard to learn to speak a foreign language. D. Ophelia took classes in painting and ...

Social Studies
yes thanks

Social Studies
how are interest rates and wages similar? A. both rise due to inflation B. both are types of prices. C. both relate to the cost borrowing D. both are payment for work done i think B

Social Studies
how are interest rates and wages similar? A. both rise due to inflation B. both are types of prices. C. both relate to the cost borrowing D. both are payment for work done i think B

PHYSIC
what is the horizontal distance a slingshot on a 25 m cliff will shoot if it's initial velocity is 240 m/s and it's inclined at 45 degrees y = 25 + 9.8/(240cos45)^2) x^2 ? ^^would this be the right formula?

Science
If you are riding your bike and hit a curb and stop suddenly at 25m/s when you hit the curb and it took you only .75 seconds to stop after hitting the curb. What was your acceleration?

social studies check
what is the most likely effect on a person's income if he or she has little education and few skills? A. the person's income will vary greatly. B. the person's will earn a high income. C. the person's income will decline over time. D. the person's will earn...

whats the anser

Social Studies
Which of these goods and services is paid for with federal taxes? A. community roads. B. military bases C. public universities D. police protection. i think B

Social Studies
The government must provide some goods and services because? A. they are too expensive for entrepreneurs to provide. B. demand for them is greater then supply. C. private producers have no incentive to do so. D. not many people are interested in buying them. i think B

Chemistry - dilutions
The concentration of stain in the bottle was 5% and you added 100 microliters of it to 9.9ml of a buffer to make a working dilution of stain. You then combined 10 microliters of that diluted stain with 40 microliters of your diluted cells and put a few microliters of that ...

chemistry
at 17.9 degrees celsus ethyl ether has a vapor pressure of 400 torr. What is the mole fraction of ethly ether in a solution which has a vapor pressure of 380 torr, if the solute is non-volatile at 17.9 degrees celsus?

Statstics
Let's pretend the Work variable is normally distributed, with a mean/median/mode value of 22 and a standard deviation of 17. Based on these numbers, we can say that approximately 50 percent of SOC 390 students work more than ____ hours per week (round answer to the nearest...

P.E
in order to make healthy choice, you must learn to_________risks. A. ignore B. advocate for C. evaluate D. take more. i think its B

P.E
The way in which your emotions affect your physical and overall health is part of? A. setting goals B. heredity C. the mind-body connection. D. your cultural environment. I think its c

Statistics
Let's pretend the Work variable is normally distributed, with a mean/median/mode value of 22 and a standard deviation of 17. Based on these numbers, we can say that approximately 50 percent of SOC 390 students work more than ____ hours per week (round answer to the nearest...

Statistics
Let's pretend the Work variable is normally distributed, with a mean/median/mode value of 22 and a standard deviation of 17. Based on these numbers, we can say that approximately 68 percent of SOC 390 students work between ______ and ______ hours per week.

math proportions
what are you solving for? x?

geometry
1/8uw +1/8vw

P.E
B.

P.E
all of the traits passed biologically from parent to child are known as? A. risk factors. B. behavior. C. heredity. (D.) environmental influences.

Pre-Calc
The peak of a mountain is observed from the base and from the top of a tower 180 ft high. Find the height of the mountain above the base of the tower is the angles of elevation of the peak are 21 degree 35’ and 24 degree 48’

Math
How can you make 83c using only pennies, nickels,dimes ,or quarters

physics
A spherical shell is formed by taking a solid sphere of radius 20.0 cm and hollowing out a spherical section from the shell's interior. Assume the hollow section and the sphere itself have the same center location. a) If the hollow section takes up 90% of the total volume...

math
a man is 68 inches tall and casts an 8 foot shadow. A tree casts a 21 foot shadow, how tall is the tree

Science
Having scientic literacy involves being able to? A. ask scientific qustions. B. evaluate scientic information. C. understand scientific terms. D. all the above. i think C.

Science
help fastwhich of the following statements incorrectly describes a tool used by scientists? A. A compound light microscope enables a scientist to view objects too unaided eye to see. (B).A beaker is a type of glassware a scientist uses in the lab to record data. C. A scale is ...

Science
which statement best describes the benefit of having a universal system of measurement? A. Scientists from different counties can more easily shared and compare data from experiment. B. Scientists who speak difference languages do not have to translate each others work into ...

Science
which statement best describes the benefit of having a universal system of measurement? A. Scientists from different counties can more easily shared and compare data from experiment. B. Scientists who speak difference languages do not have to translate each others work into ...

Science
which of the following describes scientific inquiry?(1 point) A.a statement that describes what scientists expect to happen in experiment. B.facts,figtures,and other evidence gathered through observation. (C).the diverse ways in which scientists study the natural world. D.a ...

Science
which of the following describes scientific inquiry?(1 point) A.a statement that describes what scientists expect to happen in experiment. B.facts,figtures,and other evidence gathered through observation. (C).the diverse ways in which scientists study the natural world. D.a ...

P.E
Visiting your doctor for regular check-ups is an example of which step you might take to meet take to meet your health goals? A. gain awareness. (B). gain knowledge. C. build health skill. D. set goals.

Post a New Question