# Posts by ROSE

Total # Posts: 1,291

**Chemistry**

Determine the number of moles of NaCl in the solution. Measured Mass of NaCl: 11.69g Measured Vol of Water: 100mL Molar Mass of NaCL: 58.44g/mol 11.69gNaCL/58.44g/mol = 0.20 mol NaCl Do I then to multiply my answer by 100ml? 0.20 x 100=20.00mol NaCl?

*March 16, 2017*

**Chemistry**

Is is possible to get 100% on a percent yield? Now, For Cup A I had : Mass of cup water & stirrer: 67.51 mass of sodium bicarbonate: 1.00g mass of citric acid: .76g total mass of all: 69.27g mass of cup, solution, stir after reaction: 68.75g difference (CO2 mass) = 0.52 My ...

*March 2, 2017*

**science**

1. A (high densities) 2. C

*February 24, 2017*

**science**

It is new and old at the same time

*February 16, 2017*

**Chemistry **

Hydrogen gas, H2, reacts with nitrogen gas, N2, to form ammonia gas, NH3, according to the equation 3H2(g)+N2(g)?2NH3(g) PArt 1: How many grams of NH3 can be produced from 3.26 mol of N2 and excess H2. Part 2: How many grams of H2 are needed to produce 13.17 g of NH3? part 3 ...

*February 7, 2017*

**chemistry**

In part B of my question, I was asked calculate the number of atoms in 0.462 mol of 13C (mass number of this Carbon is 13). I received the correct answer of 2.78E23 atoms. However, I do not know how to do Part C of my question, which asks "Based on your answer in Part B, ...

*February 4, 2017*

**language art**

From the play "The Diary of Anne Frank" Examples of Dramatic Irony - Find 3 of them. Find the quote. Explain why it is ironic.

*February 3, 2017*

**math**

is it 27+24+18=69?

*February 1, 2017*

**math**

Ryan's team won 2 games and scored 27 points in the first game and 24 in the second game. They lost a game 40 to 18. What was the total number of points the team scored in the winning game?

*February 1, 2017*

**math **

a 6 pack of undershirts costs 13.98. This is 3,96 less than the cost of buying 6 individual shirts. If each undershirt costs the same amount, how much does each undershirt cost when purchased individually?

*January 31, 2017*

**pre-algerabra**

If dexters room is 10 wide and 12'6" long and in his drawing is 4 wide is it true or false if I doulbe the quantity I doulbe the other?

*January 27, 2017*

**Calculus**

UPDATE** I meant with limits regarding 0 and 2!!

*January 16, 2017*

**Calculus **

I would like to make sure my answer is correct: Question: the base of a solid is the triangular region with the vertices (0,0), (2,0), and (0,4). Cross sections perpendicular to the x-axis are semicircles. Find the volume of this solid. My Work: ?[0,2] (pi/2)(r^2)dx r = (-2x+4...

*January 16, 2017*

**Math**

Compare Noah's expenses to the following spending guidelines. What changes would he need to make to fall within the guidelines?

*January 2, 2017*

**Fun Physics**

A box is given a push up a 16.1° incline. When it reaches the bottom again it is only going 0.59 its original speed. Find the coefficient of kinetic friction. *I know the answer is .06 but I don't know how!

*December 30, 2016*

**Math**

Sally charges $175 for 5 hours of babysitting. How can I put that into an equation. What is the slope of the line, what is the y-intercept, is it proportional, and is it a function???????

*December 12, 2016*

**Algebra**

2+5s-4

*December 10, 2016*

**Quadratic Relations, Algebra, Math**

URGENT!! PLEASE HELP In a volleyball match. Jenny serves the volleyball at 14m/s, from a height of 2.5m above the court. The height o the ball in flight can be estimated using the equation h=-4.9t^2+14t+2.5, where h is the height, in meters, and t is the time, in seconds, ...

*December 8, 2016*

**Math**

If the perrimiter of a regular hexagon is 75 what is the length of each side

*December 4, 2016*

**Physics**

A box is given a push up a 26.0° incline. When it reaches the bottom again it is only going 0.51 its original speed. Find the coefficient of kinetic friction.

*December 1, 2016*

**Science**

A car completes a half of a circular track that has a radius of 10 m. What is the distance traveled by the car? What is the displacement of the car?

*November 29, 2016*

**Math Quadratic Equations . URGENT!!!!**

A toy rocket is launched form a 3m platform, at 8.2m/s. The height of the rocket is modelled by the equation h=-4.9t^2+8.1t+3 where h is the height, in metres, above the ground and t is the time, in seconds. After how many seconds will the rocket rise to a height of 6m above ...

*November 20, 2016*

**Math, Quadratic equations**

A toy rocket is launched form a 3m platform, at 8.2m/s. The height of the rocket is modelled by the equation h=-4.0t^2+8.1t+3 where h is the height, in metres, above the ground and t is the time, in seconds. After how many seconds will the rocket rise to a height of 6m above ...

*November 20, 2016*

**PRE-CALCULUS**

(a) $429,440.97; (b) $431,200.96; (c) $425,729.59; (d) $424,351.12; (e) $423,534.64

*November 18, 2016*

**PRE-CALCULUS**

. Sam won $150,000 in the Michigan lottery and decides to invest the money for retirement in 20 years. Find the accumulated value for Sam’s retirement for each of his options: (a) a certificate of deposit paying 5.4% compounded yearly (b) a money market certificate paying...

*November 18, 2016*

**PRE-CALCULUS**

Find the accumulated value of a $5000 investment which is invested for 8 years at an interest rate of 12% compounded: (a) annually (b) semi-annually (c) quarterly (d) monthly (e) continuou

*November 18, 2016*

**Physics**

You buy a plastic dart gun, and being a clever physics student you decide to do a quick calculation to find its maximum horizontal range. You shoot the gun straight up, and it takes 36.761s for the dart to land back at the barrel. What is the maximum horizontal range of your gun?

*October 31, 2016*

**Physics**

William Tell must split the apple atop his son’s head from a distance of 45.1m. When William aims directly at the apple, the arrow is horizontal. At what angle must he aim it to hit the apple if the arrow travels at a speed of 45.956m/s

*October 30, 2016*

**math**

the ratio of boys to girls in a senior class is 5:3. if 9/10 of the boys may graduate and all the girls may or may not graduate, what is the maximum part of the senior class that may graduate?

*October 7, 2016*

**chemistry**

The normal boiling point of methanol is 64.7oC. A solution containing a nonvolatile solute dissolved in methanol has a vapor pressure of 670.0 torr at 64.7oC. What is the mole fraction of methanol in this solution?

*October 5, 2016*

**chemistry**

Glycerin, C3H8O3, is a nonvolatile liquid. What is the vapor pressure of a solution made by adding 159 g glycerin to 338 mL H2O at 39.8oC? The vapor pressure of pure water at 39.8oC is 54.74 torr and its density is 0.992 g/cm3.

*October 5, 2016*

**Social Studys**

Its c i think

*September 21, 2016*

**Math**

The price of a small cabin is $45,000. The bank requires a 5% down payment. The buyer is offered two mortgage options: 20-year fixed at 6.56.5% or 30-year fixed at 6.56.5%. Calculate the amount of interest paid for each option. How ...

*September 18, 2016*

**math**

Ruth baked a big cake to sell during the school fair. She cut the cake into many equal pieces. She sold two- thirds of the pieces. She gave half of the remaining pieces to her friends. She then had 6 pieces left to bring home. Into how many pieces did she cut the cake?

*August 29, 2016*

**math**

There are 48 balls in a box. If 1/4 of the balls are white, 1/6 of them are blue, 1/8 of them are red and the rest are green, how many balls of each color are there?

*August 29, 2016*

**Algebra Quadratic Functions**

HOW DO YOU DO PART TWO? The performer stands on a tightrope 3m above ground and theows a diabolo upwards. In each throw , the height (ym) of the diabolo above the ground after s seconds is given by y=-s^2+3s+4 1) Find maximum height that the diabolo can reach My answer: 25/4 ...

*August 8, 2016*

**math quadratic functions**

Alice cuts a ribbon of length 40cm into two pieces to form two squares as shown in th figure (there was no figure, but from my assumption the two squares are probably different ). Let xcm be the length of a side of one of the two squares a)express the total area of the two ...

*August 8, 2016*

**Algebra Quadratic EFuncyoon**

David has 200m of fencing to enclose three identicle rectangular pens as shown in the figure. Let x be the length of each pen. a) express the total area of the pens in terms of x My answer: 2x^2-100x (It is correct according to the answer key) b) find the maximum total area of...

*August 8, 2016*

**maths**

Solve this anagram of a famous mathematician: ghetgNlai

*August 4, 2016*

**chemistry**

Hydrogen chloride reacts with water to produce an ion with the chemical formula H3O+. An H3O+ ion has one dative covalent bond. Explain how the bond is formed.

*July 18, 2016*

**discrete math**

1.Let functions f and g be defined by f(x)=2x+1, and g(x)=x^2-2, respectively. Find a)(gof)(a+2) b)(fog)(a+2) 2.Let A={x:x≠2) and define f: A→R by f(x)=4x/(2x-1) . Is f is one- to- one? Find the range of f . Then find f^(-1) and hence determine the domain and ...

*July 9, 2016*

**discrete math**

Let R be a relation "is located in" from set x of y of countries. state each the following in words and state whether the statement is true or false. a)(Bangi,Selangor) b)(Kota Bharu,Johor) c)(Miri,Sabah) d)(Pekan, Pahang)

*July 8, 2016*

**math**

Let R be a relation on A={2,3,4,6,9} defined by "x is relatively prime to y", that is the only positive divisor or x and y is 1. a)write R as an ordered pair b)Draw a diagraph representing R c)Find the in-degree and the out-degree of each vertex d)List all paths of ...

*July 8, 2016*

**math**

how many committee of five people can be chosen from 20 men and 12 women if a) exactly three men must be on each committee b) at least four women on each committee

*July 6, 2016*

**math**

yes, there are two different questions a) exactly three men must be on each committee b) at least four women on each committee thank you

*July 5, 2016*

**math**

how many committee of five people can be chosen from 20 menand 12 women if exactly three men must be on each committee and at least four women on each committee

*July 5, 2016*

**math**

an outfit consists of skirt and a blouse. if there are 6 skirts and 8 blouses from which to choose, then how many different outfits are possible? we assume that any possible combination can be worn together.

*July 3, 2016*

**Msth**

I have a spinner that is divided into 3 equal parts,1/3 is N, 1/3 is E,and 1/3 is U. Use a tree diagram to find the probability that the spinner lands on N both times if the dpinner is spun twice?

*May 31, 2016*

**A question**

What are some ideas being propagated by society that most adhere to even though they know its wrong

*May 29, 2016*

**Basic math for science**

A sportswear manufacture determines that the marginal cost of producing x worm-up suits is given in dollars by 20-0.015x.if the cost of producing one suits is $25,find the cost function and the cost of producing 50 suits and 100 suits

*May 29, 2016*

**Religion**

Thank you

*May 28, 2016*

**Religion**

The question im asked is "What is it that im a slave to? What is holding you back, what you need liberation from. I wanna discuss on how i am a slave to my emotions. is it possible that your emotions can hold you back?

*May 28, 2016*

**Chemistry**

Complete the following equations: A) methyl butanone + oxygen ---> B) a pentagon + F2 ----->

*May 26, 2016*

**Chemistry**

What would the reaction of these two look like (reactants and products) A) hexanal is reduced B) Butanoic acid is neutralized by potassium hydroxide

*May 26, 2016*

**Chemistry**

Complete the following equations: 1. Benzene + hydrogen fluoride ----> 2. Propanoic acid + ethanol ----> 3. 3-pentanol --->(oxidized)

*May 23, 2016*

**Chemistry**

Complete the following equations. Include names of all reactants and products A) CH3CH2CHCH - CH2+H2O --> | CH3 B) CH3CHC=CCH3 + H2 ---> | CH3

*May 23, 2016*

**physics**

A wire 20cm long carry current of 2A is placed perpendicular to a uniform magnetic field. If a force of 0.8N acts on it. Calculate the value of the magnetic field intensity B

*May 18, 2016*

**Math**

I don't think your question has anything to do with math... Post a relevant question to the topic you need help with.

*May 16, 2016*

**Math**

Is this an example of two-variable data? Data Management Marks: 74,81,66,53,92,45,80 Grade 12 Average: 77,87,68,67,85,55,76 i think it is..

*May 16, 2016*

**Science**

If you are in a spacecraft that has been launched into space, your weight would A) Increase because gravitational force is increasing. B) Increase because gravitational force is decreasing. C) Decrease because gravitational force is decreasing. D) Decrease because ...

*May 12, 2016*

**English**

I think the answer is either to be entertained or to gain understanding but i think the answer that makes the most since would be to gain understanding.

*May 12, 2016*

**life orientation**

Evaluate the physical, social and economic consequences of this crime to the offender. How did this corruption and fraud impact negatively in the country example service delivery,tax,expenses of trial?

*May 8, 2016*

**Chemistry**

What are the molecular formula for: 3-methylpentanoic acid Cis-2-propyl-2-hexane N-methylpropanamine N-methylhexan-3-amine

*May 8, 2016*

**Math**

How can i find misleading graphs on the news online??

*April 27, 2016*

**math**

write an expression that represents how much you would make per hour on holidays if you earned time and a half (40 hours for 50 weeks)

*April 25, 2016*

**Chemistry please help**

A general reaction written as 1A + 2B --> C + 2D is studied and yields the following data: Expt (A). (B) initial (C)/t 1. 0.150. 0.150. 8.00 x10^-3 2. 0.150. 0.300. 1.60 x10^-2 3. 0.300. 0.150. 8.00 x10^-3 What is the order of the reaction with respect to B? What is the ...

*April 25, 2016*

**Chemistry**

The average rate of disappearance of ozone in the reaction 2O3(g) ---> 3O2 (g) is found to be 8.12 x 10^-3 molecules over 15 seconds. What is the rate of appearance of O2 during this interval

*April 24, 2016*

**Math please help**

I don't understand?

*April 24, 2016*

**Math please help**

My values: 0.012 0.008 0.005 0.0035 0.0025 0.002 0.0018 0.0017 For a graph.. What scale on the x axis should I go by to plot these values... The time is the y axis which I know the scale... But I can't think of a scale to go by for these values

*April 24, 2016*

**Chemistry**

Given info: Time(s). (ClO) mol/L 0.0. 0.012 4.0. 0.008 8.0. 0.005 12.0. 0.0035 16.0. 0.0025 20.0. 0.002 24.0. 0.0018 28.0. 0.0017 Calculate the average rate of the overall reaction

*April 24, 2016*

**STATS**

A survey found that 36% of students still enjoy doing research in a library. A random sample of 326 students showed that 105 of them will continue to go to library. If the critical value is -1.65 what is your decision.

*April 24, 2016*

**Chemistry**

How do I answer this question? The average rate of disappearance of ozone in the reaction 2O3 --> 3O2 is found to be 8.12 x 10^-3 molecules over 15 seconds. What is the rate of appearance of O2 during this interval?

*April 22, 2016*

**Chemistry**

Two electron configuration: Mg(Ne)3s^2 Zn(Ar)4s^2 3d^10 Using the configurations, explain the difference in relative reactivity of the 2 metals ( which are Mg and Zn)

*April 19, 2016*

**Chemistry**

Two electron configuration: Mg(Ne)3s^2 Zn(Ar)4s^2 3d^10 Using the configurations, explain the difference in relative reactivity of the 2 metals ( which are Mg and Zn)

*April 19, 2016*

**Chemistry**

Two electron configuration: Mg(Ne)3s^2 Zn(Ar)4s^2 3d^10 Using the configurations, explain the difference in relative reactivity of the 2 metals ( which are Mg and Zn)

*April 19, 2016*

**Chemistry**

Use the collision theory to explain the increase in rates of the other reactions

*April 19, 2016*

**Chemistry**

Write balanced reaction for the following metal acid reaction A) Mg and HCI B) Zn and HCI

*April 18, 2016*

**English**

Writing a haiku about a cellphone

*April 15, 2016*

**math**

My values are: 0.075 0.025 0.1 0.075 0.1 0.125 0.05 0.125 0.025 0.15 0.125 0.025 What would be an appropriate scale to go by on a bar graph.@bobpursely suggested 40:1 what does this mean???

*April 13, 2016*

**Math**

My values are: 0.075 0.025 0.1 0.075 0.1 0.125 0.05 0.125 0.025 0.15 0.125 0.025 What would be an appropriate scale to go by on a bar graph.

*April 13, 2016*

**Chemistry**

How do I calculate the heat released by 1 mole MgO Given: 0.5 g of MgO Heat gained by acid is 1337.6 kJ I calculated the moles for MgO which I got 0.0125 I'm not sure if I'm on the right track..

*April 12, 2016*

**Chem**

How do I calculate the heat released by 1 mole MgO Given: 0.5 g of MgO Heat gained by acid is 1337.6 kJ I calculated the moles for MgO which I got 0.0125 I'm not sure if I'm on the right track...

*April 12, 2016*

**Chemistry please help!**

The reaction through which carbon changes from graphite to diamond form is represented by the equation C(graphite) ---> C(diamond) delta H: ? Using the reactions below, determine the amount of heat absorbed in the change of one mole of graphite to one mole of diamond C(...

*April 7, 2016*

**Chemistry please help**

The reaction through which carbon changes from graphite to diamond form is represented by the equation C(graphite) ---> C(diamond) delta H: ? Using the reactions below, determine the amount of heat absorbed in the change of one mole of graphite to one mole of diamond C(...

*April 7, 2016*

**Chem**

The reaction through which carbon changes from graphite to diamond form is represented by the equation C(graphite) ---> C(diamond) delta H: ? Using the reactions below, determine the amount of heat absorbed in the change of one mole of graphite to one mole of diamond C(...

*April 6, 2016*

**Chemistry**

Calculate the enthalpy of formation of maganese (IV) oxide based on the following information. 4Al(s) + 3MnO2(s) --> 3Mn(s) + 2Al2O3(s) Delta H = -1790 kJ 2Al(s) + 3/2O2 (g) ---> Al2O3 (s) Delta Hf = -1676 kJ

*April 6, 2016*

**Chemistry**

So i would change the sign of the second equation and add them?

*April 5, 2016*

**Chemistry**

The reaction through which carbon changes from graphite to diamond form is represented by the equation C(graphite) ---> C(diamond) delta H: ? Using the reactions below, determine the amount of heat absorbed in the change of one mole of graphite to one mole of diamond C(...

*April 5, 2016*

**Chem**

How did u get 4.186 kj?

*April 5, 2016*

**Chem**

Compound B is burned in a bomb calorimeter that contains 1.50 liters of water. When I burned 50.0 grams of compound B in the calorimeter, the temperature rise of the water in the calorimeter was 35.0 degrees C. If the heat of combustion of compound B is 2,150 kJ/mol, what is ...

*April 5, 2016*

**Chemistry**

Consider the following three reactions: Ca(s) + 2H2O(l) ---> Ca2+(aq) + 2OH^- (aq) + H2(g) CaO(s) + H2O(l) ---> Ca2+ (aq) + 2OH^- (aq) H2(g) + 1/2O2 (g) ----> H2O (l) Delta H = 430.75 kJ Delta H = 81.55 kJ Delta H = 285.63 kJ Determine Delta H for the overall reaction...

*April 5, 2016*

**Chemistry**

How much energy will be liberated upon the combustion of 12.5 grams of ethene? C2H4(g) + 3O2(g) ----> 2CO2(g) + 2H2O(g) Delta H = -1387.4 kj

*April 4, 2016*

**Need ideas**

It is for Religion class... Grade 12.. we are just supposed to explain the topic and connect it to the Catholic Church...

*April 3, 2016*

**Need ideas**

I am doing a presentation on Consumerism... I need ideas on activities that have to do with Consumerism I can do with the class... To engage them

*April 3, 2016*

**Religion**

How does St.Therse of Lisieux exemplify the qualities from the parable the Good Samaritan

*April 1, 2016*

**life orientation**

No guys plz help with answer not wat u r doing and let's help each other plz plz plz

*March 31, 2016*

**Math**

I need help coming up with a unique game that can be played at a carnival, amusement park or casino.... and u need to be able to explain the probabality of your game. Any ideas

*March 30, 2016*

**maths**

A.If 0 is less than or equal to thita is less than 360 ,find all possible value of thita such that : 1.Sin thita =0.5623

*March 29, 2016*

**English**

I have to write a point form outline for a short story... i need to start with a flashblack but not sure how? the topic: Your main character is an easy going 74-year old woman. The story begins in a doctors surgery. Your character is determined to get to the truth.

*March 26, 2016*

**Math**

The game of euchre uses the 10s, jacks,queen,kings and aces from a standard deck of 52 cards. How many 5-card euchre hands have at least 2 red cards? Explain your reasoning. What is this question asking me to find, this is what I don't understand

*March 21, 2016*