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Questions Asked on March 22, 2010

Hi I tried to understand this but I don't know why the answer is B:Which one of the following pairs cannot be mixed together to
1. 1 answer
2. asked by Kiki
3. 6,969 views
A certain reaction has a delta H= -75 kJ and an activation energy of 40 kJ. A catalyst is found that lowers the Activation
1. 1 answer
2. asked by josh
3. 4,831 views
Write the 12 mole ratios that can be derived from the equations for the combustion of isopropyl alcohol.2 C3H7OH(l) + 9 O2(g)
1. 1 answer
2. asked by Jack
3. 3,619 views
what is the maximum number of grams of PH3 that can be formed when 6.2 g of phosphorus reacts with 4.0 g of hydrogen to form PH3
1. 2 answers
2. asked by jose
3. 2,948 views
The mass of a paper clip is approximately1. 1 x 10^.6 kg 2. 1 x 10^3 kg 3. 1 x 10^-3 kg 4. 1 x 10^6 kg
1. 2 answers
2. asked by Priscilla
3. 2,482 views
There exists a correlation between maximum electrostatic potential and acid strength. As pKa decreases (acid strength
1. 1 answer
2. asked by Joe
3. 2,441 views
Which of the following are examples of a physical change?a)change in physical state b)change in size or shape c)change in
1. 3 answers
2. asked by Sara
3. 2,423 views
Hi! Thank you for your help...A 25.0 mL sample of 0.723 M HClO4 is titrated with a 0.273 M KOH solution. The H3O+ concentration
1. 1 answer
2. asked by Kiki
3. 2,264 views
Which of the following everyday activities are physical changes, and which are chemical changes?a)salting ice on a driveway
1. 2 answers
2. asked by Sara
3. 2,249 views
What are the major organic products of this reaction:CH3CH2CH2COCH2CH3 (an O is double bonded to the C before the O) + H2O -->
1. 1 answer
2. asked by Bobby
3. 2,231 views
The solubility of compounds containing the carboxylic acid group can be increased by reaction witha) sulfuric acid b) nitric
1. 3 answers
2. asked by Kristin
3. 2,150 views
If i take the inverse of a value, what happens to its uncertainty?For example, if I have C +/- deltC and then i do 1/C. What
1. 1 answer
2. asked by jude
3. 1,936 views
Match the terms with the correct description:a. regulates supply of gases from ATP production b. provides negative feedback
1. 1 answer
2. asked by mysterychicken
3. 1,903 views
What were some arguments and counter arguments of Martin Luther King's " I have a dream" speech? I have recognized bias,
1. 1 answer
2. asked by I need help
3. 1,902 views
Pure benzene has a normal freezing point of 5.50 degrees Celsius. A solution containing 11.4 grams of a molecular substance
1. 1 answer
2. asked by Katelynn
3. 1,812 views
How do I convert the polar equation r - 3cos(theta) = 5sin to cartesian equation form?
1. 2 answers
2. asked by karen
3. 1,656 views
The combustion reaction of acetylene gas is represented by this equation:2 C2H2(g) + 5 O2(g) ==> 4 CO2(g) + 2 H2O(g) How many
1. 3 answers
2. asked by Ralph
3. 1,558 views
The combustion reaction of acetylene gas is represented by this equation:2C2H2(g) + 5 O2(g) ==> 4CO2(g) + 2H2O(g) How many grams
1. 2 answers
2. asked by Danny
3. 1,485 views
Why did scientists once think there were volcanoes on the moon? What evidence from the Apollo landings makes this unlikely
1. 3 answers
2. asked by hillary post
3. 1,405 views
When methanol undergoes complete combustion, the products are carbon dioxide and water. 2CH3OH (l) + 3O2(g) --> 2CO2(g) + 4H2O
1. 1 answer
2. asked by Monica
3. 1,368 views
2NaHCO3 + H2SO4 ->Na2SO4 + 2H2O + 2CO2Can u tell me physical states of the equation?
1. 2 answers
2. asked by Khin
3. 1,354 views
simplify thr ratio 6yd/10ft
1. 1 answer
2. asked by tommira
3. 1,340 views
To make a solution with a pH = 4.40 a student used the following procedure :a certain amount of sodium acetate along with 0.280
1. 1 answer
2. asked by Rinzin
3. 1,314 views
Which of the following geological changes are physical changes and which are chemical changes?a)formation of a limestone cave
1. 1 answer
2. asked by Sara
3. 1,260 views
A bird of mass 0.8kg hovers upwards by beating the mass of effective area 0.5m^2. (i) what is its upthrust? (ii) estimate the
1. 1 answer
2. asked by Edwin
3. 1,230 views
An experiment consists of tossing a coin 14 times.(a) How many different outcomes are possible? (b) How many different outcomes
1. 0 answers
2. asked by Jared
3. 1,225 views
What is the percent by mass of Ca3N2?
1. 1 answer
2. asked by Sam
3. 1,223 views
Tom received 90 votes in the student council election. That was 30% of the total votes cast. How many votes were in the
1. 1 answer
2. asked by Joe
3. 1,214 views
A capacitor of capacitance C= 10mF, is charged using a battery of potential V, through a resistor of resistance R = 250 ohms.the
1. 1 answer
2. asked by drwales
3. 1,209 views
Construct a structure chart, as well as a flowchart and pseudocode, for the following problem. Assume that each input record
1. 0 answers
2. asked by nina
3. 1,204 views
When you add CuSO4+KI the substance stays clear and when you add hexane to it it became brownish yellow and a red substance was
1. 3 answers
2. asked by Dalala
3. 1,197 views
Consider this reaction: CO (g) + H2O (g0 <---> CO2(g)+H2(g)kc=102 at 500 K A reaction mixture initially contains 0.145 M of CO
1. 1 answer
2. asked by Katie
3. 1,196 views
ISOLATION OF CHLOROPHYLL AND CAROTENOID PIGMENTS FROM SPINACH:What would happen to the Rf values of the pigments if you were to
1. 3 answers
2. asked by Chinma
3. 1,191 views
container A has twice the capicity of container B. container A is full of sand and container B is empty. suppose 1/8 of the sand
1. 0 answers
2. asked by Katherine
3. 1,105 views
John Smith wants $80,000 per year in his retirement. He plans to be in retirement for 30 years. He has 25 years to work. Assume
1. 1 answer
2. asked by Ashley
3. 1,099 views
100-g sample of substance is heated to 100˚C and placed into calorimeter cup containing 150 g of water at 25˚C. The sample
1. 1 answer
2. asked by John
3. 1,095 views
You pull downward with a force of 27 N on a rope that passes over a disk-shaped pulley of mass 1.3 kg and radius 0.075 m. The
1. 1 answer
2. asked by Mary
3. 1,090 views
Is the somewhere where I could learn how to graph polar coordinates such as (1,pi/3)?
1. 1 answer
2. asked by bill
3. 1,078 views
Your company is considering a replacement of an old delivery van with a new one that is more efficient. The old van cost $30,000
1. 1 answer
2. asked by ananoumous
3. 1,075 views
A 150 g sample of metal at 55.0 C raises the temperature of 150 g of water from 23.0 C to 35.0 C. Determine the specific heat of
1. 2 answers
2. asked by adina
3. 1,074 views
For the following electrochemical cell, what is the correct, balanced reaction?Cu(s) | Cu2+(aq) || Ag+(aq) | Ag(s) A. Cu(s) +
1. 2 answers
2. asked by Val
3. 1,037 views
the solubility of a gas is 0.34g/L at STP. What is it's solubility at a pressure of 0.80 atm and the same temperature?
1. 1 answer
2. asked by David
3. 1,027 views
An electron is accelerated through 2550 V from rest and then enters a region where there is a uniform 1.30 T magnetic field.
1. 1 answer
2. asked by Anonymous
3. 1,027 views
I have to complete a course selection form for school but I'm having some trouble understanding some of the courses. Can someone
1. 3 answers
2. asked by John
3. 1,002 views
here is the question.it is a fact that when you add acetone to saturated sodium chloride, the equilibrum shifts towards the
1. 3 answers
2. asked by Dalala
3. 998 views
I have an exam in oceanography coming up and I'm having a little trouble understanding directions. For example in my review
1. 1 answer
2. asked by Krysten
3. 990 views
Hi I need some help on finding the correct answers,I got these wrong, my answers were : 2c/4c/7d/9a/13d/14c/16c/19b/20cThanks 2.
1. 10 answers
2. asked by Deya
3. 985 views
NaHCO3 + H2SO4 Na2SO4 + H2O + CO2Use minimal integer numbers to balance the reaction. Include physical states in your answer.
1. 1 answer
2. asked by Khin
3. 980 views
how many gram of potassium bromide can be made from 13.7 grams of potassium and unlimited bromide
1. 3 answers
2. asked by Sienna
3. 974 views
Determine the [H3O^+] of a 0.240 M solution of formic acid.
1. 1 answer
2. asked by Eddie
3. 960 views
One way to make the overall message of this article more objective would be to.Select all that apply remove the quality
1. 4 answers
2. asked by Betty
3. 956 views
The centers of a 14 kg lead ball and a 120 g lead ball are separated by 9.0cm .What gravitational force does each exert on the
1. 1 answer
2. asked by Nicole
3. 950 views
Are there any reliable websites that would give information and statistics on improvements that should be made to Immigration
1. 1 answer
2. asked by Emily
3. 945 views
Hi there,could you help me with the following questions;1.) Analyze the key features (any asymptotes, intercepts, critical
1. 0 answers
2. asked by Karen
3. 934 views
A cannonball is launched from a cannon on a wall. If the path is traced on piece of paper so that the cannon is situated on the
1. 1 answer
2. asked by DEE
3. 926 views
container A has twice the capicity of container B. container A is full of sand and container B is empty. suppose 1/8 of the sand
1. 1 answer
2. asked by Katherine
3. 901 views
A voltmeter of internal resistance of 5000 Ω is connected across the poles of a battery of internal resistance 0.20 Ω. The
1. 1 answer
2. asked by Selma
3. 882 views
how many ways can you arrange 6 books on a shelf horizontally?
1. 2 answers
2. asked by Paula
3. 873 views
For the Unit 1 Discussion Board assignment, you will: (1) select a topic from the list below, (2) develop a thesis statement
1. 4 answers
2. asked by Anonymous
3. 856 views
There are 10 women and 8 men in a club. How many different committees of 6 people can be selected from the group if equal
1. 2 answers
2. asked by Paula
3. 856 views
container A has twice the capicity of container B. container A is full of sand and container B is empty. suppose 1/8 of the sand
1. 1 answer
2. asked by Katherine
3. 847 views
A solar panel (an assemblage of solar cells) measures 58 cm x 53 cm. When facing the Sun, this panel generates 2.7 A at 14 V.
1. 1 answer
2. asked by Jenny
3. 843 views
Which of the following kitchen activities are physical changes, and which are chemical changes?a)cooking bacon-chemical b)making
1. 2 answers
2. asked by Sara
3. 828 views
if 16.5 of iron (II) sulfide contain 6.02 x 10^23 formula units, how many formula units of iron (II) sulfide are in 1.00 mL of
1. 1 answer
2. asked by Sienna
3. 828 views
the video media yp clubthe print media yp club the information telecommunication yp the RCY club the English conversation club
1. 1 answer
2. asked by rfvv
3. 828 views
Convert the polar equation r-3cosx = 5sinx in Cartesian equation form.
1. 1 answer
2. asked by dan
3. 796 views
What is the probability of 2 randomly chosen angles being congruent in a general triangle?
1. 1 answer
2. asked by Teresa
3. 771 views
I need to Create a table that lays out a day-by-day plan to use as a job aid for your employment search, spanning 3 weeks. I am
1. 0 answers
2. asked by anita
3. 756 views
The sum of a number and its square is 72. What is the number?I took a guess at 8, but I don't know how to put it in an equation
1. 2 answers
2. asked by Paula
3. 748 views
you can draw one segment to connect two points and three distinct segments to connect three named points. how many segments can
1. 1 answer
2. asked by Katherine
3. 747 views
How do I solve this with the elimination method?5x-10y=4 5x-10y=5 I need x=, and y= to get an ordered pair, but every time I
1. 2 answers
2. asked by bob
3. 745 views
Your company is considering a replacement of an old delivery van with a new one that is more efficient. The old van cost $30,000
1. 0 answers
2. asked by ananoumous
3. 742 views
Identify the following features of the graph of g(x) = (3/2)^x+2A) Asymptotes B) Intercepts C) Increasing or decreasing Once I
1. 1 answer
2. asked by Mark
3. 741 views
Posted by rfvv on Monday, March 22, 2010 at 3:48am.the video media yp club the print media yp club the information
1. 2 answers
2. asked by rfvv
3. 738 views
Can you please check if the following questions are correct?1) Which Lennon’s song became a special song for peace? 2) In
1. 1 answer
2. asked by Franco
3. 729 views
The demand and supply curves for an import-competing industry in a country are given by: D = 500 – 10P, S = 100 + 10P.
1. 0 answers
2. asked by JP
3. 726 views
32. To function properly, a neuron must maintain aa. membrane potential b. neurotransmitter c. negative charge on the inside d.
1. 0 answers
2. asked by mysterychicken
3. 711 views
Which of the following are examples of a chemical change?a)corrosion reactions b)combustion reactions c)dissolving of sugar
1. 2 answers
2. asked by Sara
3. 704 views
The solubility of compounds containing the carboxylic acid group can be increased by reaction witha) sulfuric acid b) nitric
1. 1 answer
2. asked by Kristin
3. 684 views
For my research paper on Coral Reefs, can someone please help me write an intro paragraph? I think I should first start by
1. 0 answers
2. asked by y912f
3. 684 views
This is the equation for the formation of Al(OH)3:6NaOH (aq) + Al2(SO4)3 (aq) �¨ 2Al(OH)3 (s) + 3Na2SO4 (aq) Would any side
1. 2 answers
2. asked by Alan
3. 682 views
Hello I to write a paper and part of the paper is asking for information I am not sure which way to go if some one can please
1. 0 answers
2. asked by Ann
3. 677 views
Suppose sin theda= – 3/5 and theda is a Quadrant III angle.Find the exact value of sin 2 theda and cos 2 theda.
1. 3 answers
2. asked by Anonymous
3. 666 views
Your math classroom has 4 computers in it. There are 18 students in the class. What is the ratio of computers to students? whats
1. 1 answer
2. asked by Jay
3. 666 views
Create two problems for your fellow students to solve. Make one of the questions a permutation and the other one a combination.T
1. 2 answers
2. asked by Linda
3. 653 views
As you are leaving the community, you notice another new community just down the street. Because you are in the area, you decide
1. 4 answers
2. asked by KiKi
3. 649 views
A.A pair of narrow, parallel slits separated by a distance of 0.335 mm are illuminated by green laser light with wavelength =
1. 0 answers
2. asked by Andy
3. 646 views
Find the derivative of y with respect to x:y=(1+cos²x)^6 y'=6(1+cos²x)^5 How do you derive inside the brackets? The answer
1. 2 answers
2. asked by sh
3. 634 views
What is the speed of a wave with wavelength=150 m and T=9.8 s, when it is moving through water 40 m deep? What is its speed when
1. 2 answers
2. asked by Krysten
3. 634 views
Find the exact value of cos7(pi)/12 using sum and/or difference identities.
1. 2 answers
2. asked by Michael
3. 633 views
During the preparation of K3[Al(C2O4)3].3H2O, NaOH was added slowly and with stirring over an approximately 10-minute period to
1. 1 answer
2. asked by Alan
3. 619 views
1. At Sora's school, the first period begins at 8:30 am.2. The first class begins at 8:30 am at Sora's school. 3. School begins
1. 1 answer
2. asked by rfvv
3. 615 views
James invested some money at 12% interest. James also invested $188 more than 4 times that amount at 13%. How much is invested
1. 2 answers
2. asked by Hannah
3. 614 views
final mass initial mass CO2 mass(1.) 84.755 minus 85.672 = .917 (2) 84.733 minus 85.684 = .951 (3) 84.757 minus 85.707 = .95
1. 1 answer
2. asked by DEBBIE
3. 613 views
How do such rewards influence recruitment or retention? This is what I have for internal and external rewards that affect
1. 3 answers
2. asked by Rayna
3. 612 views
10. How was the Great Leap Forward supposed to make China's production greater than that of the Western nations?a. by replacing
1. 1 answer
2. asked by y912f
3. 609 views
Please critique and correct this document in APA STYLE AND FORMAT.Nursing Theory as the Basis of Care Who am I? One of the
1. 1 answer
2. asked by Susan
3. 605 views
3. Consumer spending on durables falls, draw a graph to analyze the effects of this change in real interset.4. The Canadian
1. 1 answer
2. asked by kelvin
3. 595 views
Two parallel wires which carry currents I1 = 69 A and I2. The top wire is held in position, the bottom wire is prevented from
1. 0 answers
2. asked by Jason
3. 595 views
Simplify::::sin (teta) cot (teta) = cos (teta)
1. 2 answers
2. asked by John
3. 593 views

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