Tuesday

December 1, 2015
Total # Posts: 370

**Chemistry **

when potassium in water are combined they produced 4000.0 kJ of heat along with potassium hydroxide and hydrogen gas. how much energy would be produced if you dumped a 1.00 kg chunk of potassium into a swimming pool? s this reaction what is the enthalpy change?
*October 19, 2015*

**Chemistry **

When methane is combusted with excess oxygen 891 kJ of energy is produced start with 100g of methane. how much energy is produced? is this reaction endothermic or exothermic? Also provide enthalpy change for this reaction: CH4 + 2O2 (arrow)= CO2 + H2O + 891 kJ
*October 19, 2015*

**Chemistry**

2Fe2O3 + 6C + 3O2 -> 4Fe + 6Co2 What mass of Fe2O3 present is needed to produce 15 of iron? what mass of CO2 is released when 15g of iron is produced?
*October 18, 2015*

**Chemistry**

List Sn , Sn2+, Sn4+ in order of decreasing ionization energy
*October 18, 2015*

**Chemistry**

Element X has the highest first electron affinity in its period; the ground state electron configuration of it's most common ion is [Kr] 5s^2 4d^10 5p^6 a Element Y is the second largest element in it's period; it's valence electrons are in orbital(s) that have n=6...
*October 18, 2015*

**prealgebra**

translate; the quotient of 41 and the product of a number and 35
*September 17, 2015*

**physics**

PLEASE HELP! When Babe Ruth hit a homer over the 10 m -high right-field fence 80 m from home plate, roughly what was the minimum speed of the ball when it left the bat? Assume the ball was hit 1.2 m above the ground and its path initially made a 39 ∘ angle with the ground.
*September 8, 2015*

**phyics**

When Babe Ruth hit a homer over the 10 m -high right-field fence 80 m from home plate, roughly what was the minimum speed of the ball when it left the bat? Assume the ball was hit 1.2 m above the ground and its path initially made a 39 ∘ angle with the ground.
*September 6, 2015*

**physics**

When Babe Ruth hit a homer over the 10 m -high right-field fence 80 m from home plate, roughly what was the minimum speed of the ball when it left the bat? Assume the ball was hit 1.2 m above the ground and its path initially made a 39 ∘ angle with the ground.
*September 6, 2015*

**physics**

An airplane is heading due south at a speed of 734 km/h . A wind begins blowing from the southwest at a speed of 110 km/h (average). In what direction should the pilot aim the plane so that it will fly due south?
*September 3, 2015*

**Physics**

I really need help with this question, i've found that a texbook said fourth hand, but I dont know if thats a thing Which rule is used to find the direction of force produced by electromagnetic induction? a. First right-hand rule b. Second right-hand rule c. Third right-...
*June 3, 2015*

**Physics**

I also got for 2. D
*June 3, 2015*

**Physics**

I got some of the answers I think 7. False 6. True 5. False 1. D 3. D Are these correct?
*June 3, 2015*

**Physics**

I need some help with a few multiple choice quadroons that I don't understand 1.EMF is best described as a(n) a. electric force. b. energy measure. c. charge flow rate. d. potential difference. 2. Which rule is used to find the direction of force produced by ...
*June 3, 2015*

**Math**

The parking lot has 5/6 as many vans as trucks. What equation can be use to show the number of vans?
*May 28, 2015*

**Probability**

1. 4 2. 4 3. 6 4. 4
*May 19, 2015*

**probability**

5. 2/5
*May 16, 2015*

**probability**

1. 0.44 2. 1/9 2/9 6/9 3. 1/9
*May 16, 2015*

**probability**

1. 0.44 2. 1/9 2/9 6/9 3. 1/9
*May 14, 2015*

**geometry**

the following system of equations bounds a region. If the region is rotated about the line x=0, what is the shape of the resulting solid figure? y=-2x+4 X=0 Y=0 Y=2
*March 24, 2015*

**physics**

We have to do a lab in physics where we research and write on real life applications of momentum, the guidelines we have are Research Assignment: Application of Momentum in Real-Life Situations Task: Choose any real-life situation where the concept of momentum is involved and ...
*March 24, 2015*

**Chemistry **

I have to do a lab on equilibrium, where you have to transfer water with two different sized straws, and answer questions based on that the questions are about the significance of where there is a flat line on the graph, and the significance of the point where the two lines ...
*March 19, 2015*

**Chemistry **

I need definitions for chemistry and I can't come up with any heterogeneous reaction homogeneous reaction activation energy activation energy activated complex elementary reaction
*March 16, 2015*

**math**

Aaron earns $1.50 for every video game he sells. When he sells one carton of 30 video games, he earns an additional $10. What is the minimum number of video games he has to sell in order to earn $450?
*March 5, 2015*

**geometry**

find the area bounded by a regular pentagon with radius 6 cm. round to the nearest tenth.
*March 2, 2015*

**Math**

Davida bought a pair of earrings, each in the shape of an isosceles triangle with equal side lengths of 24 mm and a base length of 16 mm. She used one earring to make another pair of earrings, similar in shape, with the base length equal to 11 mm. What is the length of the ...
*February 27, 2015*

**Geometry**

The circumference of a circle is 20 pi cm. Find diameter, radius, and area of the disk, the length of an arc of 90 angle and area of a 90 angle sector. Answer in terms of pi. d= ___ r= _____, disk area= _______ arc length =______, sector area =________
*February 26, 2015*

**math**

At 8 A.M., Dylan and his neighbor, Mickey, drove in their cars to a city that was 240 mi. away from their neighborhood. When Dylan reached the city, Mickey had 40 mi. to go. He finally completed the trip 48 minutes later. a) How long did it take Mickey to drive to the city? b...
*February 26, 2015*

**Chemistry**

what is the trend in the atomic radii as the atomic number increases across a period? What is the exception to this trend? I know the radius decreases as you go from left to right, but I can't figure the exception, I read somewhere that it's the noble gasses but I'...
*February 23, 2015*

**Chemistry **

what is the trend in the atomic radii as the atomic number increases across a period? What is the exception to this trend? I know the radius decreases as you go from left to right, but I can't figure the exception, I read somewhere that it's the noble gasses but I'...
*February 23, 2015*

**Chemistry**

what is the trend in the atomic radii as the atomic number increases across a period? What is the exception to this trend? I know the radius decreases as you go from left to right, but I can't figure the exception, I read somewhere that it's the noble gasses but I'...
*February 20, 2015*

**Chemistry **

what is the trend in the atomic radii as the atomic number increases across a period? What is the exception to this trend? I know the radius decreases as you go from left to right, but I can't figure the exception, I read somewhere that it's the noble gasses but I'...
*February 20, 2015*

**math**

thank you
*February 19, 2015*

**math**

A basket contained 75 brown eggs and some white eggs. Salima found that 15% of the total number of eggs were rotten. Of the rotten eggs,2/3 were white and the remaining 6 were brown. a) How many white eggs were there altogether? b) How many eggs were not rotten?
*February 19, 2015*

**Chem**

What pairs of ions produce similar colours in the flame test? Use your periodic table of elements to explain the reason for this. I think it's the different groups of elements, but I'm not sure.
*February 17, 2015*

**physics**

What angle might give you the greatest height? How could you test this with a simulation that does not go off the page? What angle might give you the greatest distance? How could you test this with a simulation that does not go off the page? What angle will give you minimum ...
*February 13, 2015*

**geometry**

Isosceles trapezoid JKLM has legs Jk and LM and bases KL and JM. Jk=8X+5 KL=4X+1 LM=10x+4 and MJ=18X+3, area of JKLM?
*February 8, 2015*

**Geometry**

find the area of a triangle whose vertices have coordinates:(5,5)(3,4)(8,3)
*February 3, 2015*

**HSM/230**

Post a 200- to 300-word response to the questions found at the end of the case study.
*February 3, 2015*

**Math**

Kelly was helping a friend with cleaning her bedroom. Kelly spent two hours and cleaned 80% of the room. what fraction of the room did Kelly help clean? How would I solve this - divide?
*January 21, 2015*

**MATH**

a rodeo performer spins a lasso in a circle perpendicular to the ground. the circle has a diameter of 118cm. she starts with the knot at the lowest point which is at 90 cm above the ground, she spins the lasso and .5 seconds later the knot is at the highest point. 1.what is ...
*January 16, 2015*

**Language Arts**

I don't know what it is than
*January 8, 2015*

**Language Arts**

Is it c
*January 8, 2015*

**Language Arts**

yes
*January 8, 2015*

**Language Arts**

I think its c please answer ASAP.
*January 8, 2015*

**Language Arts**

4. What is the significance of the speech James Otis delivered at the last meeting of the Observers? (1 point) a)Many of the Observers considered Otis to be insane by that time. b)Otis delivered an inspirational speech about the costs of war and the reasons for fighting. c)...
*January 8, 2015*

**CHEMISTRY**

Identify the conjugate base in the following reaction. H2O (l) + HCO31- (aq) ¨ H3O+ (aq) + CO32- (aq)? Identify the Bronsted-Lowry acid in the following reaction. H2O (l) + HCO31- (aq) ¨ H3O+ (aq) + CO32- (aq)
*December 3, 2014*

**chemistry**

so its 7m?
*December 3, 2014*

**probability**

The lifetimes of batteries are independent exponential random variables, each having parameter λ. A flashlight needs 4 batteries to work. If one has a flashlight and a stockpile of n batteries, what is the expected time that the flashlight can operate?
*November 22, 2014*

**Math **

Sally has 3 planting boxes . Each box is 4 feet wide and 8 feet long. How much space does she have altogether? Is it 3x4 + 3x8= 36 total feet?
*November 12, 2014*

**math**

LEGO R bricks are very common toys and have a structure that allows them to be placed on a rectangular grid. This makes them great for interesting questions about math. A 24 brick has two rows and four columns, making it have 8 total studs. But a 24 is the same as a 4...
*November 10, 2014*

**Physics **

Repairing a spaceship CJ drops a hammer and it took .68 s to fall .90 m to the ground. What is the magnitude of the gravitational accerleration on mars
*November 2, 2014*

**Calculus - PLEASE HELP!**

Find al points where tangent lines to: (x^2+y^2)^(3/2) = sqrt(x^2+y^2) + x is either horizontal or vertical using implicit differentiation.
*October 27, 2014*

**Calculus**

Find al points where tangent lines to: (x^2+y^2)^(3/2) = sqrt(x^2+y^2) + x is either horizontal or vertical.
*October 26, 2014*

**Calculus**

Find al points where tangent lines to: (x^2+y^2)^(3/2) = sqrt(x^2+y^2) + x is either horizontal or vertical.
*October 26, 2014*

**Calculus**

All right! Thank you :)
*October 26, 2014*

**Calculus**

a hyperbola passing through (8,6) consists of all points whose distance from the origin is a constant more than its distance from the point (5,2). find the slope of the tangent line to the hyperbola at (8,6).
*October 26, 2014*

**Calculus**

The graph of the equation x2 − xy + y2 = 9 is an ellipse. Find the lines tangent to this curve at the two points where it intersects the x-axis. Show that these lines are parallel.
*October 26, 2014*

**math**

A hotel has rooms numbered 1 to 1000. One thousand visitors enter the hotel. 1. The first visitor switches on the light switches of every room. 2. The second visitor switches off the light switches of every other room, starting with room 2. 3. The third visitor toggles the ...
*October 20, 2014*

**math**

yes,disregard the disclaimer....
*October 19, 2014*

**math**

Downtown Mathville is laid out as a square grid of 9 North-South streets and 9 East-West streets (See diagram). Your apartment is located at the Southwest corner of downtown Mathville. (See point T.) Your math classroom is located in a building that is 6 blocks East and five ...
*October 19, 2014*

**Math**

A number and its absolute value are equal. If you subtract 2 from the number, the new number and its absolute value are not equal. What do you know about this number? What is a possible number that satisfies these conditions?
*October 12, 2014*

**math**

Consider an equilateral triangle with points located at each vertex and at each midpoint of a side. (See picture.) This problem uses the set of numbers {1, 2, 3, 4, 5, 6}. Place one number at each point. Call the sum of the three numbers along any one side (two vertices and ...
*October 10, 2014*

**art history**

d.
*October 9, 2014*

**Science**

-Describe the zero sum rule -True of False: The formula for the nitride ion is N^(-3) -True of False: The stock system shows the charge on the negative ion Answer this Question
*October 1, 2014*

**math**

1. Finding the Counterfeit Coin. You have 5 coins. You know that one of them is counterfeit and weighs less than the others. Suppose also that you have a balance scale. Is there a strategy for finding the counterfeit coin using the balance scale only twice? If yes, what is the...
*September 30, 2014*

**chemistry**

A mixture of 3.00 g of silver and copper metals was dissolved in excess nitric acid. Resulting salts, silver(I) nitrate and copper(II) nitrate, were isolated and dissolved in enough water to make 0.100 L of a solution with a total concentration of the nitrate ion equal to 0....
*September 29, 2014*

**math**

Ruth buys 20 pencils for $20. some cost $4,some $0.25 and some $.50 each. at least one of each. How many of each price?
*September 22, 2014*

**physics**

7.4 waves crash onto a beach every 58.3 s. What is their frequency?
*September 21, 2014*

**Chemistry**

A protein subunit from an enzyme is part of a research study and needs to be characterized. A total of 0.135g of this subunit was dissolved in enough water to produce 2.00 mL of solution. At 28 ∘C the osmotic pressure produced by the solution was 0.138 atm. What is the ...
*June 27, 2014*

**Math**

√(5y+1)-√(3y-5)=2, I need to solve algebraically, and state any restrictions on the values for the variables, which I can't remember how to do
*June 12, 2014*

**MAth **

4+sqrt(4+x^2)=x, I need to isolate the x variable in the radical equation, but I can't figure out how to do it. The answer is x=3/2
*June 12, 2014*

**English**

Then it would be something along the lines of because 20% of teenagers and youth suffer from mental illnesses, parents should be aware of how to recognise problems in their children so they can receive proper care.
*June 11, 2014*

**English**

Because I don't know what a thesis statement is and I've never written one.
*June 11, 2014*

**English**

I've written the paper and edited it already.
*June 11, 2014*

**English**

Its less of an essay and more of an article type thing
*June 11, 2014*

**English**

Im writing an essay in English about mental illnesses in teenagers and youth and i can't think of An appropriate title for it. I need some ideas of how to make on or some suggestions.
*June 11, 2014*

**English **

I asked a question earlier about creating a title for an article i wrote in English, the article being about school, and the pressure to achieve and the stress on students, and I can't figure out a good title, I've gotten some help from people and suggestions but I can...
*June 3, 2014*

**Math**

7+15=22 7-15=-8 the line has to be between 8 and 22 to work, otherwise it would be a straight line so it cannot be a, 5cm
*June 3, 2014*

**English**

I didnt mean homework, I meant more that school work and the pressure to achieve is a large stress
*June 3, 2014*

**English**

I'm writing an article for my english exam prep, and my main topic that i went off of was the relationship between school, homework and stress on teenagers (the exam prep topic is relationships) in the article I talk about how homework is a large stress in most teenagers ...
*June 3, 2014*

**History**

Would an answer the question make sense if it was something like 'the ethical dimensions of bill 94 are that the bill is to protect the security of many people, but the ban on face coverings goes against peoples religion'
*June 3, 2014*

**History **

I still need help with what ethical dimensions are, I understand that it's 'the scope of right and wrong''the extreme of right and wrong' but I don't understand how to apply that to my question, which is what are the ethical dimensions of bill 94? Bill ...
*June 3, 2014*

**history **

What are ethical dimensions? I've searched google but I don't understand what it means.
*June 2, 2014*

**History **

What are the ethical dimensions of bill 94? (Bill in Quebec that banned face covering in any government funded building such as hospitals, government-subsidized high schools and universities) I mostly need help on the definition of ethical dimensions, I can't remember what...
*June 2, 2014*

**Math**

Kelly's scores on the first three tests in her physics class are 79, 84, and 68. Determine all scores on the fourth test that will yield an average test score of at least 80.
*May 24, 2014*

**History **

1)How did enlistment in the Canadian military change between first world war and second world war? What changed? I have a few points but I can't think of any more 2)how has the Canadian military changed from the second world war? Research the the inclusion policies to see ...
*May 23, 2014*

**History.**

Do you think the CRTC's restriction on media freedom were reasonable in the 1960's? DO you think they are reasonable now? Explain.
*May 15, 2014*

**Maths Probability**

var(XY) = E[(XY)^2] - (E[XY]^2) = 7/9
*May 14, 2014*

**Chemistry **

During an acid-base titration, 25 mL of NaOH 0.2 M were required to neutralize 20 mL of HCl. Calculate the pH of the solution for each: a) Before titration b) After adding 24.9 mL of NaOH c) At equivalence pt d) After adding 25. 1 mL of NaOH e) The pH of the equivalence pt ...
*May 10, 2014*

**Algebra 1B**

It's not factorable. Try using the quadratic formula to solve for x.
*May 10, 2014*

**physics**

A 50kg girl sits at the top of a slide 6m long tilted at an angle of 30 degrees. if it takes her 3.3s to slide to the bottom and the coefficient of kinetic friction is 0.45, how fast will she be going at the bottom?
*April 10, 2014*

**physics**

A car has a flywheel ( a diks of R=0.2m and uniformly distributed mass M=100kg) that can convert 25% of the rotational kinetic energy into translational kinetic energy. The mass of the car is 1000kg ( including flywheel). Suppose the car is at rest, and the flywheel has a ...
*December 30, 2013*

**physics**

Hi, Elena. Thanks for helping me with the neutron star problem. I knew the formula, but kept getting answers that were not close to the possible choices. What variables did you use. Thanks again for your help.
*December 25, 2013*

**physics**

Assume that the mass of a neutron star is 1.5 times that of the Sun and the radius of the neutron star is 10 km. Ignore effects of Special Relativity. What is the approximate speed at which an object released from far away (at zero speed) reaches the surface of a neutron star...
*December 25, 2013*

**PHYSICS URGENT HELP **

a charges electric potential energy within an electric field is calculated as the product of the ____ of it's position times the magnitude of it's charge
*December 18, 2013*

**Physics**

ANY ANSWERS WILL HELP! THANKS! 1. Isolated points of electric charge are called ____. 4b. ____ was the American physicist who first measured this fundamental unit of charge. 5. This type of electrification occurs when the charging rod touches an electroscope. 6. This type of ...
*December 17, 2013*

**chemistry**

determine the density in copper at 1305K. 1 mole of vacancies in copper is 104kJ. The answer I calculated this time is 8.4572*10^22. I am not sure if this correct. Thanks.
*November 17, 2013*

**chemistry**

DDD I may not be using the right formula. I am getting negative answers. Down to last chance.
*November 17, 2013*