Tuesday

August 4, 2015

August 4, 2015

Total # Posts: 402

**Math**

the half life of a radioactive substance is one day. You have 100 grams. how much of the substance would be left after a week?
*July 30, 2015*

**Chemistry**

Calculate the molarity of a solution made by adding 33.4 mL of concentrated nitric acid (70.4 % by mass, density 1.42 g/mL) to some water in a volumetric flask, then adding water to the mark to make exactly 2000 mL of solution. (It is important to add concentrated acid or base...
*June 23, 2015*

**Chemistry**

Moles of potassium nitrite (in 536g) would be 6.29 or 6.3 moles, correct?
*April 20, 2015*

**Chemistry**

I forgot to add the equation so here it is: 2KNO3(s) ---> 2KNO2(s) + O2(g)
*April 20, 2015*

**Chemistry**

How many grams of potassium nitrate (KNO3) are required to produce 536 g of potassium nitrite (KNO2) according to the equation below? *I've tried this question for so long and I get so many different answers in the end so please help.
*April 20, 2015*

**business**

A proportionate tax consumes a determinate apportionment of one’s monetary flow.
*March 18, 2015*

**Physical Chemistry**

If a 30g piece of ice at -5C is immersed in 125mL of water at 25C in an insulated container... A. Determine the final temperature and final composition of the system B. Determine the entropy changes of the ice and the water and the overall entropy change of this process.
*March 16, 2015*

**math - relations and functions**

What is mean , Write a set of 10 ordered pairs that represent a function?
*February 17, 2015*

**Physics **

An optical fiber is made of a clear plastic with index of refraction n=1.6, For what angles with the surface the light remain contained within the plastic guide?
*January 4, 2015*

**physics**

A stone is thrown into water pond forming 10 waves in 5 seconds. The diameter of the first crest is 13 m and the diameter of the last crest is 4m. Find a.the periodic time b.the frequency c.the wave length d.the wave velocity
*January 1, 2015*

**math**

Classic Furniture purchases dining room sets with an invoice date of September 27, and terms of sale of 3/10, n/60. What is the net date? A) October 17 B) October 22 C) November 2 D) November 26
*December 14, 2014*

**Mechanics **

A 1-kg ball in the air has an initial velocity vo = [ 20 ] i + [ -30 ] j m/s. It falls for a total time of 1 s. Assume that positive x-values are to the right and positive y-values are upward. A)What is the impulse or change in momentum Delta p of the ball? B)What is the final...
*December 5, 2014*

**physics**

The acceleration of gravity is 9.8 m/s 2 . What is the magnitude of the total force on a(n) 87 kg driver by the dragster he operates as it accelerates horizontally along a straight line from rest to 41 m/s in 5.3 s? Answer in units of kN
*November 30, 2014*

**POL 201**

torn between A and C
*November 3, 2014*

**POL 201**

_______ is core to the notion of “life, liberty and the pursuit of happiness” in the Declaration of Independence. (Points : 1) Human agency Pure unfettered liberty the idea that government may never restrict citizens’ liberty the concept of American exceptionalism
*November 3, 2014*

**POL 201**

Thank U
*November 3, 2014*

**POL 201**

If Americans were said to have a positive liberty to work, then the government (Points : 1) may not prevent one from working. is required to provide jobs to those that cannot find jobs. may never pursue a policy that leads to unemployment. must prohibit discrimination in the ...
*November 3, 2014*

**ashford**

Those who attended the Constitutional Convention believed that (Points : 1) England was an evil society. America had made a great mistake in fighting the revolutionary war. British institutions of government were good but they became corrupt. America would only achieve ...
*November 3, 2014*

**math**

In three successive years the price of the common shares of Bedrock Resources Ltd. fell 40%, 60%, and 70% ending the third year at 50 cents. How much (in dollars and cents) did the share price drop in the second year?
*October 27, 2014*

**physics**

A box slides down a 28° ramp with an acceleration of 0.98 m/s2. Determine the coefficient of kinetic friction between the box and the ramp.
*October 12, 2014*

**chemistry**

what could cause the difference in the actual number of mole and the expected number of mole in copper oxide?
*October 7, 2014*

**chemistry**

what is the molar ratio of 0.114 copper to 0.116 oxygen? Then how do you make an empirical formula from this information?
*October 7, 2014*

**chemistry**

in a empirical formula lab how do you calculate the number of moles of Cu in 0.0114 moles of CuSo4*H2O? Thanks
*October 7, 2014*

**calculus**

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. x+y=4,x=5−(y−1) 2 ;
*October 1, 2014*

**physics**

A hunter wishes to cross a river that is 1.0 km wide and that flows with a speed of 4.9 km/h. The hunter uses a small powerboat that moves at a maximum speed of 9.6 km/h with respect to the water. What is the minimum time necessary for crossing?
*September 28, 2014*

**math**

sum of 3 number is equal 39 , the second number is half of third number ,and the first number less than third number by 1,the result must be 6 degit ?
*September 11, 2014*

**geometry**

Two rectangles are similar. If the height of the first rectangle is 3 inches, and the height if the second rectangle is 9 inches, how much larger is the second rectangle's area?
*July 23, 2014*

**Statistics**

A COMMITTEE OF 5 PEOPLE IS TO BE FORMED FROM 15 PARENTS AND 10 teachers. Find the probability that the committee will consist of at least one parent.
*July 11, 2014*

**chemistry**

which complementary functional group from dopamine would need to be present in the receptor for the interaction to occur.
*May 27, 2014*

**chem**

which complementary functional group from dopamine would need to be present in the receptor for the interaction to occur.
*May 27, 2014*

**chemistry**

i need to find the enthalpy for COF2 F2 (g) + CO (g) --> COF2 (g) i found -507 but i am not sure if it is correct
*May 21, 2014*

**science**

i need to find the enthalpy for COF2 F2 (g) + CO (g) --> COF2 (g) i found -507 but i am not sure if it is correct
*May 21, 2014*

**research**

Thank you
*April 27, 2014*

**research**

So would he research problem be: determining the effectiveness of the electronic monitoring (EM), used for serious offenders supervised in the community?
*April 27, 2014*

**research**

what is the research problem discussed in the article: UNDER SURVEILLANCE: AN EMPIRICAL TEST OF THE EFFECTIVENESS AND CONSEQUENCES OF ELECTRONIC MONITORING? I have read this and I am totally lost. Please help
*April 27, 2014*

**Math**

Given a total profit of p(x) = 1.4x-0.02x^2-20 let x represent a number of days and find profit achieved and when that profit is made
*April 22, 2014*

**criminal justice**

explain the relationship between theory and hypothesis development and testing
*April 19, 2014*

**Chemistry**

.20mol
*April 18, 2014*

**Math**

Abby has 18 blue socks and 4 white socks. How many socks does she need to pull out in order to have a matching pair of socks?
*April 10, 2014*

**Statistics**

a procedure in REGRESSION NALYSIS WHERE PREDICTOR OR INDEPENDENT VARIABLES ARE CODED AS 1 OR 0 (REPRESENTING CATEGORIES) AND CAN BE USED TO PRODUCE ANOVA TABLES UNDER THE GENERAL LINEAR MODEL IS KNOWN AS?
*April 5, 2014*

**physics**

a stone is thrown vertically upward with a speed of 10.5 m/s from the edge of a cliff 76.0 m high. how much later does it reach the bottom of cliff? what is its speed just before hitting? what total distance did it travel
*February 9, 2014*

**POL 201**

The Tenth Amendment balances out national authority by
*January 25, 2014*

**math **

1.45-7.3
*October 17, 2013*

**algebra 2**

x + my =d
*September 19, 2013*

**Business Statistics**

3456
*July 28, 2013*

**maths**

find value of p such that the equation (x+1)(x+2)=p
*June 10, 2013*

**calculus**

simplify aab-3/Ba^2b-2
*June 9, 2013*

**Chemistry**

What chemical feature in the protein dictates the local secondary structure? α-helix β-pleated sheet random coils amino acid sequence pH hydrogen bonding
*May 31, 2013*

**Chemistry**

Why does the equation Co(H2O)6 + 4Cl <------> CoCl4 + 6H2O shift left when cooled?
*May 1, 2013*

**Chem--PLEASE HELP 911**

A- 14H + 6Fe^2+ + Cr2O7^2- --> 6Fe^3+ + 2Cr ^3+ + 7H2O B- 3N2H4 +4Cl03- --> 6NO2+ 12Cl- + 6H2O This was all I was able to come up with, am I at lease headed in the right direction?
*April 25, 2013*

**Chem--PLEASE HELP 911**

Balance the following redox reaction and identify the oxidizing and reducing agents A- Fe2+(aq) + Cr2072-(aq) -->Fe3+(aq) + Cr3+(aq) (acidic) B- N2H4(g) + ClO3-(aq) -->NO2(g) + Cl- (basic)
*April 25, 2013*

**CHEM-PLEASE HELP**

Calculate the molar solubility of silver chloride (AgCl) in: a-deionized water and b-.20M NaCl solution Given Ksp=1.6*10^-10
*April 25, 2013*

**Chemistry**

Balance the following redox reaction and identify the oxidizing and reducing agents A- Fe2+(aq) + Cr2072-(aq) -->Fe3+(aq) + Cr3+(aq) (acidic) B- N2H4(g) + ClO3-(aq) -->NO2(g) + Cl- (basic)
*April 25, 2013*

**chemistry**

Calculate the molar solubility of silver chloride (AgCl) in: a-deionized water and b-.20M NaCl solution Given Ksp=1.6*10^-10 please show work.
*April 25, 2013*

**CALCULUS**

Let the line l0 be defined by x = 1−t, y = 2+3t, z = 1−2t. Determine whether each given line intersects l0. If it does, give the intersection point. l1 :x=2+t, y=5−2t, z=1+3t l2 :x=6+2t, y=1+t, z=5+t
*April 24, 2013*

**books**

I need to write a Year 9 English Unit on the novel,"Strange Objects" by Gary Crew. I can't seem to find any resources to assist me. Can you help direct me to finding some???? thanks
*April 23, 2013*

**CHEMISTRY**

Suppose a student adds 25.00 mL of 1.025 M HCl to a 1.50 g antacid tablet. The student boils and then titrates the resulting solution to the endpoint with 0.4969 M NaOH. The titration requires 21.3 mL NaOH to reach the endpoint. How many moles of HCl were neutralized by the ...
*April 23, 2013*

**CHEMISTRY**

If a tablet contains 129 mg of Mg(OH)2 and 505 mg of CaCO3, how many moles of HCl would theoretically be neutralized?
*April 22, 2013*

**Chemistry **

You titrate a 10.0 mL sample of phosphoric acid with a 1.65 M solution of the base potassium hydroxide. It takes 7.55 mL to reach the endpoint of the titration. What is the molar concentration of the original solution of phosphoric acid? 3KOH + H3PO4 --> K3PO4 + 3H2O
*April 13, 2013*

**Chemistry **

A 10 mL sample of 1.5 M Potassium Phosphate is placed in a 100 mL volumetric flask and diluted to the mark. What is the Molar concentration of Potassium ions in this diluted solution?
*April 11, 2013*

**chemistry/science**

That is the question that I was given for homework and it stumped me also. Is it possible that the answer is transition metals. I looked on the periodic chart and found that that is what was possibly inside it. I am confused. Wondering if you could clarify the answer??
*April 4, 2013*

**chemistry/science**

What are the groups of atoms inside iron called?
*April 4, 2013*

**physics**

A slide is 5 inches high. it is placed 5.5 inches from the convex lens of a porjection lantern. The image is cast upon a screen 55 inches away. the focal length of the lens is ______inches? b) the heigh of the image cast by the lens is ________inches?
*March 19, 2013*

**Algebra 2**

Sidewalk of uniform width has area of 180 ft squared and is surrounded ny a flower bed that 11 ft wide and 13 ft long. Find the width of the sidewalk?
*March 17, 2013*

**ecology**

During the demographic transition of the eighteenth century, humankind led advances in mortlity and economy, leading to a prosperous population growth. What types of resources are necessary for population change and how might the availability of resources in different ...
*March 14, 2013*

**sociology**

There is a disparity between theory and direct observation. Because theories are based on observations, how are these theories first developed in the absence of direct observations?
*March 14, 2013*

**chemistry**

A sample of chlorine gas is collected by water displacement at 23C. If the atmospheric pressure is 751 torr, what is the partial pressure due to the chlorine?
*March 14, 2013*

**chemistry**

To raise the temperature of 200.8 g of water from 50.00 °C to 60.00 °C requires how much heat?
*February 28, 2013*

**algebra**

lura has 4 yards of material.she is making clothes for her doll. each dress requires 1/6 yards of material. how many dresses will she be able to make?
*February 27, 2013*

**math**

A piece of cardboard measure 12ft by 12ft. Corners are to be cut from it as shown by the broken lines, and the sides folded up to make a box with an open top. What size corners should be cut from the cardboard to make a boxx with the greatest possible volume.
*February 27, 2013*

**science**

What is the term used to describe making older buildings more resistant to earthquakes?
*February 25, 2013*

**Spanish: Please check answers**

3.duermo 4.devuelve 5.podemos 6.cuentan 7.cuestan 8. vuelve 9.encuentras 10. almorzamos Your answers are correct
*February 25, 2013*

**math**

i am trying find out how you would find the height of a rectangular prism if the surface area is 100 and length is 10 and width is 6. if someone can get me started on the right way it would help ?
*February 18, 2013*

**CRT205**

I am having difficulty finding/locating the rhetorical devices within the article. This assignment has really stumped me ... :-/
*February 17, 2013*

**CRT205**

Option 1: Article Review Choose one newspaper editorial and one magazine article from the lists provided by your instructor and write a 250- to 350-word response to the following: • What rhetorical devices are found in each article? • Based on their characteristics, ...
*February 17, 2013*

**Algebra Problem Solving**

Denise's cell phone plan is $29.95 per month plus $.10 per minute for each minute over 300 minutes of call time. Denise's cell phone bill is $99.95. For how many minutes was she billed? Answer is 700 but what is the algebraic equation?
*January 29, 2013*

**Math**

There are18 boys and 20 girls in a class. What is the ratio of girls to boys?
*January 27, 2013*

**math**

i need someone to show the formula for this problem and amswer i have 16 not sure sally's art project is in the shape of a circle. she wants to put a piece of glitter string around the adge of her project has a radius of 4 inches, how much string will she need?
*January 27, 2013*

**the facility study unit**

aesthe tics is concemed with matters such
*January 17, 2013*

**math**

The sale on a map is 1 inch=12 feet. What is the actual distance between two points that are are 8 1/2 inches apart
*January 10, 2013*

**geometry**

Three security cameras were mounted at the corners of a triangular parking lot. Camera 1 was 151 ft from camera 2, which was 122 ft from camera 3. Cameras 1 and 3 were 139 ft apart. Which camera had to cover the greatest angle?
*January 4, 2013*

**Algebra 2**

How do i get the perfect square of: 3x^2+7x=-9
*December 20, 2012*

**Division**

If you have 43 marbles. You divide them equally among some sacks. How many sacks must you use to get fewer than 8that marbles in each sack?
*December 13, 2012*

**Division**

If you have 43 marbles. You divide them equally among some sacks. How many sacks must you use to get fewer than 8that marbles in each sack?
*December 13, 2012*

**math**

help me with missing number input 1 2 3 4 5 output, 2 , 5, 10, ?,26
*December 8, 2012*

**chemistry**

420
*December 5, 2012*

**chemisty **

NaOH + HCl -> NaCl + H2O What is the molarity of a NaOH solution that required 31.6mL to neutralize 25.0mL of a 0.145 M HCl solution?
*December 5, 2012*

**chemisty**

12.00 liters of oxygen gas is under a pressure of 20 mm Hg. If the volume of this gas is decreased to 2.00 liters at constant temperature, what will the new pressure be? I believe this is Boyle's law and the answer should be 120 mm Hg, but according the answer on practice ...
*December 4, 2012*

**chemistry **

12.00 liters of oxygen gas is under a pressure of 20 mm Hg. If the volume of this gas is decreased to 2.00 liters at constant temperature, what will the new pressure be? I believe this is Boyle's law and the answer should be 120 mm Hg, but according the answer on practice ...
*December 4, 2012*

**chemistry **

Reaction: Na2CO3 + 2 HCl -> 2 NaCl + CO2 + H2o How many grams of NaCl can be produced from the reaction of 1.35g of Na2CO3 with 125mL of 0.265 M HCl?
*November 30, 2012*

**CHEMISTRY**

Cant figure this out, I feel like the answer I keep getting is way too low. A voltaic cell is constructed that is based on the following reaction: Sn2+ (aq) +Pb(s) = Sn(s) + Pb2+ (a) If the concentration of Sn2+ in the cathode compartment is 1.00M and the cell generates an emf...
*November 30, 2012*

**Chemistry**

THANK YOU!
*November 29, 2012*

**Chemistry**

Hi everyone, I have been trying to figure out this titration equation all day and for some reason I am stumped. Here is the question in full: Potassium hydrogen phthalate, KHP, can be obtained in high purity and is used to determine the concentrations of solutions of strong ...
*November 29, 2012*

**Language**

What part of speech are the following words this, of, books, sighed, heavily, doctor,ask, you, address, auscultated, are, bruits, read, last, and, my, will follow up, yesterday, tomorrow, gift, call it, present, always, on
*November 14, 2012*

**Pre-calculus**

A sailboat leaves port and sails for 7 miles NE and then 9 miles NW. If the speed remains constant, what bearing would take the sailboat home?
*November 13, 2012*

**Math**

A farmer has 20 pigs ans sheep.he has 6 fewer sheep than pigs. How many pigs does he have?
*November 7, 2012*

**Chemistry**

Answer is 1.104L Oh remember that there are 0.028 mol in 1.88g of NaN2. Final, in 0.028mol of NaN3, there is 0.042 mol of N2. This is your n. so, V= ( nRT)/P remember, you are given R, T and P Hope this helps:)
*November 2, 2012*

**Chemistry**

Answer is 1.104L
*November 2, 2012*