# Noelle

Most popular questions and responses by Noelle
1. ## Chemistry

If a solution containing 118.44 g of mercury(II) perchlorate is allowed to react completely with a solution containing 17.796 g of sodium sulfide, how many grams of solid precipitate will be formed? How many grams of the reactant in excess will remain

2. ## Pre-Calculus

After leaving an airport, a plane flies for 1.75h at a speed of 200km/h on a course of 100 degrees. The plane then flies for 2 hours at a speed of 250km/h on a course of 40 degrees. At this time, how far from the airport is the planee?

3. ## Chemistry

For each of the following, write a net ionic equation (modeled above). Wherever there is a precipitate, state the name of the precipitate (e.g “lead iodide” from above). Pop onto the net and see if you can find a description of the physical properties

4. ## history

How did muckrakers of the 19th century compare to modern day journalists?

5. ## Chemistry

Suppose you are standing 201 m from a radio transmitter. What is your distance from the transmitter in terms of the number of wavelengths for the following conditions? (a) The station is broadcasting at 1150 kHz (on the AM radio band)? (1 kHz = 1

6. ## Chemistry

A mixture of CuSO4 and CuSO4·5 H2O has a mass of 1.235 g. After heating to drive off all the water, the mass is only 0.830 g. What is the mass percent of CuSO4·5 H2O in the mixture?

7. ## Math

25. Edith earns an annual gross salary of \$17,500. She has 28% of her gross salary withheld for taxes and other deductions. What is the net pay of each paycheck if she is paid weekly? \$274.04 \$43.87 \$242.31 26. Franklin deposited \$1,400 in a savings

8. ## geometry!! urgent (math)

The lateral edges of a regular hexagonal pyramid are all 20 cm long, and the base edges are all 16 cm long. To the nearest cc, what is the volume of this pyramid? To the nearest square cm, what is the combined area of the base and six lateral faces?

9. ## Math

A bag of balloons contains 2 red balloons, 10 green balloons, 16 yellow balloons, and 7 orange balloons. What is the probability that a randomly selected balloon would be green or orange?

10. ## Chemistry

Radiation in the ultraviolet region of the electromagnetic spectrum is quite energetic. It is this radiation that causes dyes to fade and your skin to develop a sunburn. If you are bombarded with 1.00 mol of photons with a wavelength of 288 nm, what amount

11. ## Chemistry

What volume of 0.105 M HNO3, in milliliters, is required to react completely with 1.40 g of Ba(OH)2? 2 HNO3(aq) + Ba(OH)2(s) Ba(NO3)2(aq) + 2 H2O(l)

12. ## Chemistry

Flask a contains 2 liters of ch4 (g) and flask b contains 2 liters of 02 (g) each gas sample has the same 1) density 2) mass 3) number of molecules 4) number of atoms

13. ## Chemistry

For the following chemical reaction, what mass of silver nitrate in grams will be needed to produce 3.91 mol of calcium nitrate? CaI2+2AgNO3=2AgI+Ca(NO3)2

14. ## Math

Im in advanced math and were doing Graphing Inequalities and im not sure how to do it.

15. ## Chemistry

When 112 g of water at a temperature of 22.5°C is mixed with 65.1 g of water at an unknown temperature, the final temperature of the resulting mixture is 46.3°C. What was the initial temperature of the second sample of water?

16. ## Chemistry

In the following reaction, 451.4 g of lead reacts with excess oxygen forming 313.6 g of lead(II) oxide. Calculate the percent yield of the reaction. 2Pb(s)+O2(g)= 2PbO(s)

17. ## statistics-math

The mean score on a Math exam was 50% and the standard deviation was 10%. Assume the results were normally distributed. (a) What percent of students earned a score between 50% and 70%? ( /2)

18. ## Chemistry

In an experiment 1.015 g of a metal carbonate, containing an unknown metal M, is heated to give the metal oxide and 0.361 g CO2. MCO3(s) + heat MO(s) + CO2(g) What is the identity of the metal M?

19. ## Chemistry

Sulfur (3.26 g) is burned in a constant volume calorimeter with excess O2(g). The temperature increases from 21.25°C to 28.22°C. The bomb has a heat capacity of 923 J/K, and the calorimeter contains 815 g of water. Calculate ΔU per mole of SO2 formed,

20. ## Math, Ratio and Proportion

Jeff mowed 2/3 of a lawn in 52 minutes. At that rate, How long would it take him to mow the whole lawn?

21. ## Chemistry

1. Engineers design air bags that deploy almost instantly upon impact. To do this, an air bag must provide a large amount of gas in a very short time. Many manufacturers use sodium azide, NaN3, to produce the gas in such a manner 2NaN3(s)  2Na(s) +

22. ## physics

A block of wood is placed in a cup of water. The block has the following dimensions: L=10cm W=5cm H=4cm. If the block is 75% submerged, how much water has been displaced?

23. ## College Physics

A CD has to rotate under the readout-laser with a constant linear velocity of 1.25 m/s. If the laser is at a position 3.2 cm from the center of the disk, what are the revolutions per minute (rpms) of the disk?

What does the word "predominant" mean? Oh and please don't give me a website with some big def. I am in 6th grade so I won't understand if the def. is big and long. It also helps if you use it in a sentence . . . just saying. :-D Thanks so much!

25. ## chemistry

how many grams of oxygen are in 560g of ribose?

26. ## math

Dorthy is 6 years older than Ricardo. The product of their present age is twice what the product of their ages was 6 years ago. How old is Dorthy?

27. ## French

Does anyone know a list of baby animals in French, or know specifically what these are? ~baby bunny ~baby "Sanglier" ~baby "vache" ~baby turkey ~baby "Cane" ~baby cerf ~baby "jars" ~baby "jument" Merci for your help

28. ## physics

How would you find the coefficient of kinetic friction if you're given a weight of 627 N and theta=45 degrees?

29. ## Physics/ optics

An object is located 25cm in front of a +6.00 lens, where is the image? is it real or virtual?

30. ## French

Thanks Senora for your help with the baby animals. I have a few more, which I tried googling/translating, but I found nothing. giraffe jars Thanks for your help

32. ## English

In the State of Union Address the President promised to improve the faltering economy, to increase the amount of federal funding available for the art programs and ?

33. ## algebra

Solve -3(5x+6)=57

34. ## Physics

What is the period of the minute hand of a clock?

35. ## optics

An objuect is located 20cm in front of a -3.00 lens where is the image?

36. ## maths

if (x + 3)(x -2) = 1 show that x^2 + x -7 = 0

37. ## math

Convert 3214five to base ten

38. ## Chemistry

Balance the redox reaction: Ag(aq)+Cu(s)= Ag(s)+Cu(aq)

39. ## algebra

Solve -3(5x+6)=57

How do you turn a fraction into a decimal?

1. ## American government

Thanks Monica :D

posted on September 21, 2017
2. ## Math

OK, I was having trouble my self on this but I do know it is complementary is 43 degrees and supplementary 133 degrees.

posted on March 9, 2016
3. ## algebra

Well it's the reflect across the x-axis, translate 2 units to the left, translate down 2 units, stretch by the factor of 2..

posted on February 22, 2016
4. ## math

if what you say about their approaching rate is true, jim ran 8 * 5/18 = 20/9 miles

posted on January 5, 2016
5. ## Chemistry

I'm so confused...how do I use the coefficients to balance the equations?

posted on October 7, 2013
6. ## physics

a: 9.8 t: 2.6 v: 2.11 d: ? d=vt+1/2at d=(2.11)(2.6)+2(9.8)(2.6) d=ANSWER

posted on October 21, 2012
7. ## science

D: density M: mass V: volume D=M/V therefore, the density is 64/16=4

posted on October 21, 2012
8. ## Science 7

One ohm is the resistance value through which one volt will maintain a current of one ampere.

posted on June 15, 2011
9. ## math

1/2, 4/8, 5/10 (all you have 2 do is multiply or divide both the numerator and denominator by the same # and you get your equivalent fractions.

posted on February 16, 2011
10. ## social studies

Type this into Wikipedia: European colonization of the Americas

posted on October 27, 2010
11. ## math

All you have to do is divide both sides by -5. You will get -1/7 because when you divide the right side by -5, the 5's cancel out to leave you with -1 on top. Let me know if you have more questions.

posted on October 27, 2010
12. ## math

Like this: 5/8 * 7/2 So, you multiply the two top numbers (5*7) and the two bottom numbers (8*2) to get the final answer for a.

posted on October 27, 2010

What exactly is the question?

posted on October 27, 2010
14. ## math

1,2,and 3 are right. 4. You need to multiply each side by the opposite. So to cancel out 2/7 on the left side, multiply by 7/2 to get a by itself. Then you have to multiply the right side by 7/2 also. Multiply 5*7 to get the top and 2*8 to get the bottom.

posted on October 27, 2010
15. ## substitution method

Okay so on the first side you have 3 which needs to be distributed to both the 31 and the -6y. On the left side you will end up with 93-18y+8y=33. Now you have to finish solving for y. Add 8y to -18y then subtract 93 from both sides. I think you can take

posted on October 27, 2010

2r-5s=-12 5r+2s=57 2r-5s=-12 +5s=+5s 2r=5s-12 /2=/2 r=(5/2)s-6 Now that you know r, plug that into the other equation and solve for s. Once you know s, you can plug s into either equation to get r.

posted on October 27, 2010
17. ## math

This is very simple. All you have to do is put what is equal to x in the second equation (31-6y) in for the x in the first equation giving you the equation 3(31-6y)+8y=33 Solve for the y with this equation then plug that answer into either of the equations

posted on October 27, 2010

You need to solve for one variable in one equation first. The easier one would probably be the first equation. Solve for r by adding 5s to both sides (which cancels 5s on the left side) then divide everything by 2. Plug that answer in for r in the second

posted on October 27, 2010
19. ## Algebra 2

The first one you would move x to the other side making it negative, or subtract x from both sides giving: y=-x+4 -1 is the m and 4 is the b For the second one, you do the same thing. Add 4x to each side canceling the 4x on the left, or move 4x to the

posted on September 22, 2010
20. ## math

5 people times 4 tickets each=20 tickets 20 tickets/100 tickets total=1/5 chance or 20% chance

posted on September 22, 2010
21. ## maths

thanks

posted on January 1, 2010
22. ## math

x=1

posted on September 4, 2008
23. ## Algebra(check pt 2)

Questions 1 and 2 are correct. I'm not sure about 3 and 4.

posted on July 3, 2008