Cris

Most popular questions and responses by Cris
1. chemistry

Calculate the volume needed to dissolve 11.2g CuSO4 to prepare 0.140M?

2. Problem Solving

John bought a shirt on sale for 25% off the original price and another 25 % off the discounted price. If the final price was \$16, what was the price before the first discount? (Please i need to present it to our school. I don't know how to solve it. Can

3. speech

Choose one of the following topic sentences. Write an eight-sentence paragraph that fully develops the topic. A. The number of automobile accidents in my town can be reduced. B. People are moving from the cities to the suburbs in increasing numbers C.

4. physics

How much would the rope stretch to break the climber's fall if he free falls 2m before the rope runs out of slack? k=1.40x10^4N//m mass of man= 90 kg I forgot how to use conservation of energy for this. I tried it, but I did it wrong.

5. CHEMISTY

A 25.0 mL sample of perchloric acid solution required 45.3 mL of 0.101 sodium hydroxide solution for complete neutralization. what was the concentration of the perchloric acide solution? work: 0.0453 L NaOH x ( .101 mol NaOH/ 1L NaOH) x (1 mol HClO4/ 1 mol

6. PHYSICS

How much would the rope stretch to break the climber's fall if he free falls 2m before the rope runs out of slack? k=1.40x10^4N//m mass of man= 90 kg I forgot how to use conservation of energy for this. I tried it, but I did it wrong.

7. Physics

2. When traveling down the road at a constant speed of 55 mph, 26.4 m/s, the tangential velocity of the wheels is also 55 mph. If a car tire is 65.0 cm in diameter, then; a. What is the period and frequency of the spinning car tire? b. What is the

8. Chemistry

A 32.907-g sample of a hydrate of Au (CN)3 contains 5.406 g H2O What is the formula for the hydrate? What is the percent water in this compound? What mass of this hydrate contains 100.0 g H2O?

9. Speech

During which step of the writing process should you identify the purpose, medium, and audience for whom you're writing? a. prewriting b.proofreading c. revising d. presenting The last three choice occur essentially after the main aspect of the writing has

10. Inorganic Chemistry

A 1.577 M solution of AgNO3 has a density of 1.220 gram per centimeter cube. What is the molality of the solution?

11. Chemistry

How do you balance the equation? MnO4^-1(aq) + C2O4^-2(aq)-> Mn^+2(aq) + CO2(g)

12. Problem Solving

John bought a shirt on sale for 25% off the original price and another 25 % off the discounted price. If the final price was \$16, what was the price before the first discount?

13. Inorganic Chemistry

Methyl Alcohol (CH3OH) and ethyl alcohol (C2H5OH) form ideal solutions at 50°C, the vapor pressure of pure methyl alcohol is 0.529 atm, and the vapor pressure of pure ethyl alcohol is 0.292 atm. What is the vapor pressure at 50°C of a solution containing

14. Managerial Accounting

Gladmark company produces two types of get well cards scented and regular drivers for the four activities as follows: Scented Regular Inspection hours 40 160 Set up hours 50 50 Machine hours 200 600 Number of moves 225 75 1. Calculate the consumption

15. Physics

How do you find the ratio of the new/ old world periods of a pendulum if the pendulum wee transported from earth to the moon, where the acceleration due to gravity is 1.63m/s^2? Im not sure if we use 9.8 at all, I think I'm supposed to use T=2 pi sqrtL/g.

16. chemistry

Please help me and show me step by step. assume that the reactions are being performed at pressure of 1.2 atm and a temperature of 298K Calcium carbonate decomposes at a high temperature to form carbon dioxide and calcium oxide. How many grams of calcium

17. Chemistry

For this equation here: H2SO4 + 2NaOH = 2H2O + Na2SO4 What is the theoretical yield of Na2SO4, in grams?

18. Physica

2. When traveling down the road at a constant speed of 55 mph, 26.4 m/s, the tangential velocity of the wheels is also 55 mph. If a car tire is 65.0 cm in diameter, then; a. What is the period and frequency of the spinning car tire? b. What is the

19. math

You are standing beside a merry-go-round that your friend is riding. The merry-go-round is 8m in diameter. Describe how the shape of the sine curve models the distance from you and your friend. Identify the function that will model this situation as well

20. math

An object is thrown or fired straight upwards at an initial speed of v_0 ft⁄s will reach height h feet after t seconds, where h and t are related to the formula h=-16t^2-v_0 t Suppose the object is fired straight upwards with an initial speed of

21. PHYSICS

A block with a mass of 126 kg is pulled with a horizontal force of F applied across a rough floor. The coefficent of friction between the floor and the block is 0.7. If the block is moving at a constant velocity, what is the magnitude of F applied? F

22. Chemistry

Aluminum carbide, Al2C3 (s), reacts with water to yield aluminum hydroxide, Al(OH)3 (aq), and methane, CH4 (g). Write the equation for the reaction. How many grams of Al4C3 (s) would be needed to prepare 1.000 L of CH4 (g) measured at STP?

23. Chemistry

determine the volume of 45mM ethanol needed to make 1700 microliters that has a final ethanol concentration of 26.5mM?

24. Calculus

I'm trying to finish up my pre-cal homework and I am stuck on 2 problems... ***determine the intervals over which the function is increasing, decreasing, or constant*** 32. f(x)=x^2-4x 33. f(x)=√x^2-1 (that's square root of x^2-1) thank you so much for

25. chemistry

a sample of carbon dioxide gas occupies 3.5 L at 25degrees C. At what temperature will the gas volume be 1 L?

26. ciminology

Monday 04/13/09 Need help with this.. based on someone's experience with these procedures. Post a 175- to 350-word response restating the events in the proper order. Answer this question as part of your response: 1.) what sources were the rights afforded

27. quemistry

arrange the following groups of elements in order of increasing ionization energy : a. Be,Mg,Sr. b. Bi,Cs,Ba. c. Na,A1,S

28. chemistry

How many moles of sodium hydroxide are produced when 0.155 mole of sodium reacts with excess water?

29. managerial accounting

Accounting homework Gladmark company produces two types of get well cards scented and regular drivers for the four activities as follows: Scented Regular Inspection hours 40 160 Set up hours 50 50 Machine hours 200 600 Number of moves 225 75 1. Calculate

31. Inorganic Chemistry

What is the mole fraction of solute in a 1.00 molal solution in which toluene (C7C8) is the solvent.

32. math

Joe and his 7 friends share 3 liters of juice how much juice each friend gets

33. Chemistry

Imagine that you needed to choose an indicator for the titration of a strong base (like NaOH) with a strong acid (like HNO3). You have the indicators in Table 1 available. Which indicator would you choose? Why? Indicator [HIn] [ In] pKa Maryland Red- Red

34. Spanish help

This is a written assignment. Will someone please help check whether it is grammatically correct. Instructions: Think of where you live in relation to the nearest airport. Write down directions on how to arrive at the airport from your house, using the

35. math

A homeowner wants to plant a garden in his backyard. He decides to have 375 square feet garden and wants the garden to be 10 feet longer than it is wide. Find the dimensions of the garden.

36. english

You are writing a paragraph on how to make your favorite sandwich. You have a list of the steps beside you, and you write down the steps in sentences, without stopping to check your work. Finally you've written all the steps into sentences, and you put

37. Speech

Please help me write an eight sentence paragraph that fully develops the topic. 1. Getting along with other people is important in my work. What exactly does "getting along" involve? What goals would "getting along" help you to meet your work goals? How

38. Economics

If the full-employment budget shows a deficit of about \$100 billion and the actual budget shows a deficit of about \$150 billion, it can be concluded that there is: a. built-in stability b. a cyclical deficit c. an expansionary fiscal policy d. a

39. math

f(x) = 4x-5 and g(x) = 3x, find (fog)(x)

40. math

An object is thrown or fired straight upwards at an initial speed of v_0 ft⁄s will reach height h feet after t seconds, where h and t are related to the formula h=-16t^2+v_0 t Suppose the object is fired straight upwards with an initial speed of

41. chemistry

If the ground state is 4S^2 , what is the name of the element

42. chemistry

supposed we mixed 50.0mL of alcohol w/ enough water to make 400mL solution find the % age by volume of 50L??? what is the answer plz answer my qeustion!!!

43. Chemistry

Balance equation c2h3cl + br2

44. Chem Lab

Aspirin synthesis and Analysis: Calculate theoretical yield of ASA? Used 3.5mL of acetic anhydride and 1.5g of salicylic acid.

45. Problem Solving

During a storewide sale, a TV which usually sells for \$450 is on sale for \$360. A Stereo which usually sells for \$600 is on sale for \$480. What would be the sale price of a VCR which usually sells for \$500?

46. Math

determine the intervals over which the function is increasing, decreasing, or constant f(x)=√x^2-1

47. science

Calculate the specific volume of an air-vapour mixture when the temp=30 degree Celsius, water vapour content Mw=0.015 kg/kg, total pressure Pt=90kpa Please any one can help me>

48. science

If air at 30 degree c Dry Bulb temp and water vapour content(Mw)=0.015kg/kg flows over a basin containing water at 10 degree C. a) what will happen to the air temp? b) what will happen to the moisture content in the air? c) what will happen to the enthalpy

49. science

Calculate the specific volume of an air-vapour mixture when the temp=30 degree Celsius, Mw=0.015 kg/kg, Pt=90kpa

50. English III

Okay so I am reading the book The Scarlet Letter and it is like really boring, so far. I am about a chapter in and my homework is really hard! I have to read a sentence the packet gives me and interpret the darn thing. It's driving me insane because these

51. social studies

did the Dawes reflect and effort by the unites states government to change native American lives? if so how?

52. something

oh yeah which one heviest element out of the first 5 of family 1, first 4 of family 2, 13, 14, and 18. The first 3 of families 15-17

53. Speech

Your friend has asked you to write down instructions for installing a kitchen sink. How should you orer the details in a paragraph? Remmeber, you want your friend to be able to easily follow the steps of the process a. spatially b. chronologically c.

54. Inorganic Chemistry

what is the molarity of concentrated hydrogen fluoride if the solution is 48% by mass and has a density of 1.17 gram per milliliter.

55. Chem Lab

I don't know how to obtain theoretical yield.

56. science

decomposing 0.00153 moles cholesterol will release what volume of hydrogen atoms?

57. Algebra

how do scientist preserve fossils frozen in ice

59. Science

how do scientists preserve a fossil frozen in ice

60. Scienc

What is the most chemicallyactive nonmetal on the world? i got Chlorine

1. math

900

posted on April 30, 2019
2. Social Studies

Angel is right

posted on October 18, 2018
3. Math

48

posted on October 4, 2017
4. statistic

.25

posted on February 20, 2017
5. Density Problem

25353

posted on December 13, 2016
6. Physica

2. When traveling down the road at a constant speed of 55 mph, 26.4 m/s, the tangential velocity of the wheels is also 55 mph. If a car tire is 65.0 cm in diameter, then; a. What is the period and frequency of the spinning car tire? b. What is the

posted on November 10, 2016
7. Language Art

3. c 4. A

posted on November 27, 2015
8. social studies

It's b

posted on November 13, 2015
9. Geometry

Not trying to find the radius were trying to find the circumference

posted on September 18, 2015
10. Physics

For anyone who is looking to solve this in the future: First figure out the angle F= 2Tsin(theta)-mg where, F is total force, and here it must be zero to be at equilibrium T=tension of rope (2.7kN) mg=mass*grav= 9.8*74 then use Tan(theta) = Opposite/

posted on February 2, 2015
11. Chemistry

posted on December 1, 2014
12. math

thank you Steve for your help

posted on May 30, 2014
13. math

yes, you're right. the equation is h=-16t^2+v_0t

posted on May 27, 2014
14. College Chemistry (DrBob222)

Excellent job! Thanks a lot

posted on March 28, 2014
15. Statistics

What do you mean "Z" scores in relation to the problem above? sorry, I'm totally confused and overwhelmed

posted on April 6, 2013
16. Physics

actually i think that's wrong, i think its only when they collide and one pushes the other. as result they move in the same direction

posted on December 10, 2012
17. Physics

so far no one is answering our questions. you should try conservation of momentum: m1v1 + m2v2=(m1+m2)vf then just solve for vf, your final velocity...just a suggestion in case you haven't tried it yet.

posted on December 10, 2012
18. physics

I got that far too, but the answer is supposed to be 2.53x10^-3 N. I am not given anything else but the volume.

posted on December 10, 2012
19. math

2^9=512 subsets

posted on December 8, 2011
20. Problem Solving

Thanks a lot Steve. Ur an angel.

posted on October 13, 2011
21. chemistry

v2xt1/v1=t2 1x298/3.5=85.1k

posted on May 8, 2010