PleaseHelp

Most popular questions and responses by PleaseHelp
  1. Chemistry

    The decomposition of potassium chlorite yields oxygen gas and potassium chloride. If the yield is 95%, how many grams of KClO3 are needed to produce10.0 L of O2?

    asked on December 11, 2011
  2. Pre-Algebra

    How many total blocks would be needed to build the model for the given base plan? [2] [1] [3] [1] [2] [2] a) 5 b) 11 c) 6 d) 12

    asked on February 19, 2015
  3. physics

    The diagram below shows two identical balls A and B on a horizontal surface. Ball B is at rest and ball A is moving with speed V along a line joining the centres of the balls. The mass of each ball is M. (DIAGRAM BEFORE COLLISION: there are 2 balls, first

    asked on January 15, 2018
  4. Chem 2

    calculate the vapor pressure of a solution made by dissolving 61.7g (molar mass= 60.06g/mol) of Urea in 212ml of water at 35C. what is the vapor pressure lowering? the vapor pressure of water at 35c =31.82 mmHg

    asked on October 9, 2014
  5. Solids of Revolution

    The region enclosed by the curve y =e^x, the x-axis, and the lines x=0 and x=1 is revolved about the x-axis. Find the volume of the resulting solid formed.

    asked on June 5, 2012
  6. History

    8. Which of the following idenetifies important advances in learning made by ancient Egyptians? (1 point) A.hieroglyphs, knowledge of the human body, and geometry B. Cuneiform, advanced farming techniques, and pyramids C. Knowledge of surgery, creation of

    asked on September 20, 2016
  7. Chemistry - Enthalpy

    When a 37.00 g silver spoon, initially at room temperature, is placed into 250.0mL of 90.00oC tea, it reaches a temperature of 85.00°C. The spoon will have gained ? J of thermal energy. I got 5237.5 Joules as (mass)x(specific heat capacity)x(Temperature

    asked on January 14, 2017
  8. History

    which of the following is an achievement of an ancient egyptians? A. They carved laws in stone pillars to address criminal acts. B. They were the earliest civilization to farm. C. They were the first multicultural empire. D. They used hieroglyphs writing

    asked on September 20, 2016
  9. math

    -x/4 - 6 > -8

    asked on May 26, 2011
  10. Chemistry

    What did you observe after the addition of dilute HCl to the saturated lead chloride solution? Explain observations using relevant chemical reaction. I observed that a white precipitate was formed. Not sure how to explain why it formed

    asked on March 29, 2014
  11. Algebra

    Find the quotient and remainder 7x^6-2x^4+x^2+2 divided by x-2

    asked on October 5, 2014
  12. Chemistry - Solubility Product

    What did you observe after the addition of dilute HCl to the saturated lead chloride solution? Explain observations using relevant chemical reaction. I observed that a white precipitate was formed. Not sure how to explain why it formed

    asked on March 29, 2014
  13. geometry

    the ratio of juniors to seniors is 9 to 8, if there are 51 juniors and seniors total, which percent of students are seniors? how do i figure this out?!

    asked on April 24, 2010
  14. math

    What inequality those this graph show: file:///C:/Users/751017272/Desktop/y%20ilt%202x%20plus%202.png (Copy and paste it) Can you show me how you get your answer also?

    asked on September 20, 2016
  15. Math

    I am a 3 digit number divisible by 3. My tens digit is 3 times as great as my hundreds digit, and the sum of my digits is 15. If you reverse my digits, I am divisible by 6, as well as by 3. What number am I? Thank you for your help.

    asked on December 10, 2009
  1. math

    product is : 5.4x10^-7 in standard form: 0.00000054

    posted on January 15, 2018
  2. Pre-Algebra

    Would it be a) 5??

    posted on February 19, 2015
  3. Chemistry

    Thank you!

    posted on March 29, 2014